Company lists · Data refreshed September 2026
Top 25 Retrofit engineering companies based in the United States
RevenueBase identified 290 company matches for retrofit engineering companies associated with the United States as of September 2026 and tracks 12,176 professional contacts across them, including 4,957 with verified work emails. New York is the largest hub.
This list covers company matches for retrofit engineering companies associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 17, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest retrofit engineering companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,383 contacts → | ||||
Exact match “Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 2 | 1,358 contacts → | ||||
Exact match “NPL is a nationally recognized leader in energy infrastructure construction, with 50 years of experience.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 3 | 658 contacts → | ||||
Exact match “STRUCTURAL TECHNOLOGIES develops, markets, and integrates proprietary products with specialty engineering services to improve, protect, and enhance infrastructure.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 4 | 655 contacts → | ||||
Exact match “Established in 1963, Baker Group is Iowa’s premier full-service specialty contractor-serving commercial, industrial, institutional, and mission-critical markets across the country.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 5 | 611 contacts → | ||||
Exact match “STRUCTURAL integrates technology-driven solutions into its industry-leading specialty contracting services.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 6 | 562 contacts → | ||||
Exact match “WE'RE HIRING FOR POWER, GAS, & INFRASTRUCTURE ROLES ACROSS THE COUNTRY!* Join the Team That Keeps Energy and Infrastructure Moving Forward.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 7 | 481 contacts → | ||||
Exact match “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 8 | 450 contacts → | ||||
Exact match “SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 9 | 285 contacts → | ||||
Exact match “Western Industrial Contractors (WIC) is a single-source systems integrator, we design, build, and integrate complex industrial systems under one roof, so you manage one…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 10 | 231 contacts → | ||||
Exact match “PalniES applies technology to deliver unique, cost-effective engineering and design solutions–-and fast.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 11 | 229 contacts → | ||||
Exact match “Allana Buick & Bers, Inc.(ABB) is a leading Architectural Engineering firm specializing in making buildings perform better by making them energy efficient and longer lasting with…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 12 | 186 contacts → | ||||
Exact match “Robert Derector Associates is a full service engineering firm with a local feel and a global reach.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 13 | 166 contacts → | ||||
Exact match “Headquartered in Harrisburg, Pennsylvania, McClure Company is one of the mid-Atlantic's largest, fully integrated mechanical construction, engineering, maintenance and energy…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 14 | 135 contacts → | ||||
Exact match “Voltyx is an integrated solutions provider focused on guiding our partners through the complex modernization of the electrical infrastructure through vision, strategy, service…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 15 | 129 contacts → | ||||
Exact match “Willdan Performance Engineering specializes in energy and infrastructure improvement projects through design-build and performance contracting.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 16 | 128 contacts → | ||||
Exact match “We Make Buildings Brilliant.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 17 | 126 contacts → | ||||
Exact match “For over four decades, Neal Electric has been at the forefront of delivering proficient and reliable electrical services across Southern California.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 18 | 103 contacts → | ||||
Exact match “Stronghold Engineering (SEI) is an award-winning design and construction firm specializing in renowned projects for some of the nation’s largest organizations.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 19 | 93 contacts → | ||||
Exact match “4Liberty is a leading technical & professional services firm focused on energy & infrastructure.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 20 | 93 contacts → | ||||
Exact match “What We Do.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 21 | 84 contacts → | ||||
Exact match “Houck has been serving the mid-Atlantic region for over 75 years with offices in Harrisburg and Greencastle, PA.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 22 | 64 contacts → | ||||
Exact match “At TEI our focus is on Electrical Solutions and providing quality workmanship in all aspects of new construction and renovation projects for both the public and private sectors.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 23 | 62 contacts → | ||||
Exact match “DFS Construction Corporation was founded on the singular principle of being the most responsible construction choice available to our clients.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 24 | 62 contacts → | ||||
Exact match “Taylor & Hill, Inc.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
| 25 | 54 contacts → | ||||
Exact match “Founded in 1910 in Pittsburgh, Pennsylvania, LLI Engineering a veteran owned small business, specializes in commercial, critical facilities, infrastructure upgrades, Green…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “retrofit engineering companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 290 retrofit engineering companies based in the United States
See the full list, filter by size, metro and specialty, and access 4,957 tracked professional contacts with verified work emails. Direct dials are available where recorded.
Free signup · no credit card
Retrofit engineering companies based in the United States at a glance
As of Sep 17, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 290 companies.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Company records associated with the United States whose business descriptions match “retrofit engineering companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 4,957 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 17, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “retrofit engineering companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many retrofit engineering companies are there based in the United States?
RevenueBase identified 290 company matches for retrofit engineering companies associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Ameresco tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most retrofit engineering companies?
New York leads with 8 company records, followed by Los Angeles (7) and Chicago (6).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 4,957 professional contacts with verified work emails tracked across these 290 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 17, 2026.
Ready to reach these companies? Verified emails and direct dials for all 290 retrofit engineering companies based in the United States. Start with a free account, no credit card.
Download this list →Related lists
Retrofit engineering companies by geography
- Retrofit engineering companies based in Brazil
- Retrofit engineering companies based in Canada
- Retrofit engineering companies based in France
- Retrofit engineering companies based in Germany
- Retrofit engineering companies based in India
- Retrofit engineering companies based in Italy
- Retrofit engineering companies based in Spain
- Retrofit engineering companies based in the United Kingdom
About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Retrofit engineering companies based in Brazil
- Retrofit engineering companies based in Canada
- Retrofit engineering companies based in France
- Retrofit engineering companies based in Germany
- Retrofit engineering companies based in India
- Retrofit engineering companies based in Italy
Company intelligence · public preview
Top 25 retrofit engineering companies based in the United States
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 290 matching company records for retrofit engineering companies based in the United States, with 12,176 tracked contacts and 4,957 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 17, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 retrofit engineering companies based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Amerescoameresco.comHQ: Framingham, MA, United StatesReported employees: 1,001-5,000 | Framingham, MA, United States | 1,001-5,000 | Exact match | 1,383 contacts → |
“Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  NPL Construction COgonpl.comHQ: Phoenix, AZ, United StatesReported employees: 5,001-10,000 | Phoenix, AZ, United States | 5,001-10,000 | Exact match | 1,358 contacts → |
“NPL is a nationally recognized leader in energy infrastructure construction, with 50 years of experience.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Structural Technologiesstructuraltechnologies.comHQ: Columbia, MD, United StatesReported employees: 1,001-5,000 | Columbia, MD, United States | 1,001-5,000 | Exact match | 658 contacts → |
“STRUCTURAL TECHNOLOGIES develops, markets, and integrates proprietary products with specialty engineering services to improve, protect, and enhance infrastructure.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Baker Groupthebakergroup.comHQ: Ankeny, IA, United StatesReported employees: 1,001-5,000 | Ankeny, IA, United States | 1,001-5,000 | Exact match | 655 contacts → |
“Established in 1963, Baker Group is Iowa’s premier full-service specialty contractor-serving commercial, industrial, institutional, and mission-critical markets across the country.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Structuralstructural.net HQ: Columbia, MD, United StatesReported employees: 1,001-5,000 | Columbia, MD, United States | 1,001-5,000 | Exact match | 611 contacts → |
“STRUCTURAL integrates technology-driven solutions into its industry-leading specialty contracting services.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Mastec Utility Servicesmastec.comHQ: Coral Gables, FL, United StatesReported employees: 1,001-5,000 | Coral Gables, FL, United States | 1,001-5,000 | Exact match | 562 contacts → |
“WE'RE HIRING FOR POWER, GAS, & INFRASTRUCTURE ROLES ACROSS THE COUNTRY!* Join the Team That Keeps Energy and Infrastructure Moving Forward.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Noresconoresco.comHQ: Westborough, MA, United StatesReported employees: 201-500 | Westborough, MA, United States | 201-500 | Exact match | 481 contacts → |
“NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Sitelogiqsitelogiq.comHQ: Minneapolis, MN, United StatesReported employees: 501-1,000 | Minneapolis, MN, United States | 501-1,000 | Exact match | 450 contacts → |
“SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Western Industrial Contractorswesterncon.com HQ: Aurora, CO, United StatesReported employees: 201-500 | Aurora, CO, United States | 201-500 | Exact match | 285 contacts → |
“Western Industrial Contractors (WIC) is a single-source systems integrator, we design, build, and integrate complex industrial systems under one roof, so you manage one…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Palniespalnies.comHQ: Schaumburg, IL, United StatesReported employees: 1,001-5,000 | Schaumburg, IL, United States | 1,001-5,000 | Exact match | 231 contacts → |
“PalniES applies technology to deliver unique, cost-effective engineering and design solutions–-and fast.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Allana Buick & Bers, INCabbae.comHQ: Palo Alto, CA, United StatesReported employees: 201-500 | Palo Alto, CA, United States | 201-500 | Exact match | 229 contacts → |
“Allana Buick & Bers, Inc.(ABB) is a leading Architectural Engineering firm specializing in making buildings perform better by making them energy efficient and longer lasting with…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Robert Derector Associatesderector.comHQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 186 contacts → |
“Robert Derector Associates is a full service engineering firm with a local feel and a global reach.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Mcclure Companymcclureco.comHQ: Harrisburg, PA, United StatesReported employees: 201-500 | Harrisburg, PA, United States | 201-500 | Exact match | 166 contacts → |
“Headquartered in Harrisburg, Pennsylvania, McClure Company is one of the mid-Atlantic's largest, fully integrated mechanical construction, engineering, maintenance and energy…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Voltyxvoltyx.comHQ: Maryland Heights, MO, United StatesReported employees: 201-500 | Maryland Heights, MO, United States | 201-500 | Exact match | 135 contacts → |
“Voltyx is an integrated solutions provider focused on guiding our partners through the complex modernization of the electrical infrastructure through vision, strategy, service…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Willdan Performance Engineeringwilldan.comHQ: Denver, KS, United StatesReported employees: 51-200 | Denver, KS, United States | 51-200 | Exact match | 129 contacts → |
“Willdan Performance Engineering specializes in energy and infrastructure improvement projects through design-build and performance contracting.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Cypress Envirosystemscypressenvirosystems.comHQ: San Jose, CA, United StatesReported employees: 11-50 | San Jose, CA, United States | 11-50 | Exact match | 128 contacts → |
“We Make Buildings Brilliant.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Neal Electric Corpnealelectric.com HQ: Carlsbad, CA, United StatesReported employees: 201-500 | Carlsbad, CA, United States | 201-500 | Exact match | 126 contacts → |
“For over four decades, Neal Electric has been at the forefront of delivering proficient and reliable electrical services across Southern California.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Stronghold Engineeringstrongholdengineering.com HQ: Perris, CA, United StatesReported employees: 51-200 | Perris, CA, United States | 51-200 | Exact match | 103 contacts → |
“Stronghold Engineering (SEI) is an award-winning design and construction firm specializing in renowned projects for some of the nation’s largest organizations.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  4liberty, INC4liberty.comHQ: San Diego, CA, United StatesReported employees: 51-200 | San Diego, CA, United States | 51-200 | Exact match | 93 contacts → |
“4Liberty is a leading technical & professional services firm focused on energy & infrastructure.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  The Will Groupthewillgroup.comHQ: Chicago, IL, United StatesReported employees: 51-200 | Chicago, IL, United States | 51-200 | Exact match | 93 contacts → |
“What We Do.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | HOUCKhoucks.com HQ: Harrisburg, PA, United StatesReported employees: 201-500 | Harrisburg, PA, United States | 201-500 | Exact match | 84 contacts → |
“Houck has been serving the mid-Atlantic region for over 75 years with offices in Harrisburg and Greencastle, PA.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  TEI Electrical Solutionsteiconst.comHQ: Frederick, MD, United StatesReported employees: 51-200 | Frederick, MD, United States | 51-200 | Exact match | 64 contacts → |
“At TEI our focus is on Electrical Solutions and providing quality workmanship in all aspects of new construction and renovation projects for both the public and private sectors.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  DFS Construction Corporationdfsconstruction.comHQ: Arlington, VA, United StatesReported employees: 51-200 | Arlington, VA, United States | 51-200 | Exact match | 62 contacts → |
“DFS Construction Corporation was founded on the singular principle of being the most responsible construction choice available to our clients.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Taylor & Hilltaylorandhill.com HQ: Texas City, TX, United StatesReported employees: 51-200 | Texas City, TX, United States | 51-200 | Exact match | 62 contacts → |
“Taylor & Hill, Inc.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  LLI Engineeringlliengineering.comHQ: Pittsburgh, PA, United StatesReported employees: 11-50 | Pittsburgh, PA, United States | 11-50 | Exact match | 54 contacts → |
“Founded in 1910 in Pittsburgh, Pennsylvania, LLI Engineering a veteran owned small business, specializes in commercial, critical facilities, infrastructure upgrades, Green…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 290 company matches
Build a targeted audience, find relevant contacts and export available records to your workflow.
Free signup · 500 credits · limited free results
Retrofit engineering companies: dataset insights
September 17, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
290 records in the displayed employee bands.
0 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 290 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 17, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for retrofit engineering companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many retrofit engineering companies did RevenueBase find based in the United States?
The saved snapshot records 290 matching company records, 12,176 tracked contacts and 4,957 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 17, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Retrofit engineering companies by geography
- Retrofit engineering companies based in Brazil
- Retrofit engineering companies based in Canada
- Retrofit engineering companies based in France
- Retrofit engineering companies based in Germany
- Retrofit engineering companies based in India
- Retrofit engineering companies based in Italy
- Retrofit engineering companies based in Spain
- Retrofit engineering companies based in the United Kingdom
Cite this list
RevenueBase Data Team. Top 25 retrofit engineering companies based in the United States. Snapshot: September 17, 2026. https://revenuebase.ai/companies/retrofit-engineering-companies/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Retrofit engineering companies based in Brazil
- Retrofit engineering companies based in Canada
- Retrofit engineering companies based in France
- Retrofit engineering companies based in Germany
- Retrofit engineering companies based in India
- Retrofit engineering companies based in Italy
Company intelligence · public preview
Top 25 retrofit engineering companies based in the United States
RevenueBase records 290 matching company records for retrofit engineering companies based in the United States, with 12,176 tracked contacts and 4,957 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 17, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 retrofit engineering companies based in the United States
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Amerescoameresco.com HQ: Framingham, MA, United StatesReported employees: 1,001-5,000 | Framingham, MA, United States | 1,001-5,000 | Exact match | 1,383 contacts → |
“Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | NPL Construction COgonpl.com HQ: Phoenix, AZ, United StatesReported employees: 5,001-10,000 | Phoenix, AZ, United States | 5,001-10,000 | Exact match | 1,358 contacts → |
“NPL is a nationally recognized leader in energy infrastructure construction, with 50 years of experience.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Structural Technologiesstructuraltechnologies.com HQ: Columbia, MD, United StatesReported employees: 1,001-5,000 | Columbia, MD, United States | 1,001-5,000 | Exact match | 658 contacts → |
“STRUCTURAL TECHNOLOGIES develops, markets, and integrates proprietary products with specialty engineering services to improve, protect, and enhance infrastructure.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Baker Groupthebakergroup.com HQ: Ankeny, IA, United StatesReported employees: 1,001-5,000 | Ankeny, IA, United States | 1,001-5,000 | Exact match | 655 contacts → |
“Established in 1963, Baker Group is Iowa’s premier full-service specialty contractor-serving commercial, industrial, institutional, and mission-critical markets across the country.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Structuralstructural.net HQ: Columbia, MD, United StatesReported employees: 1,001-5,000 | Columbia, MD, United States | 1,001-5,000 | Exact match | 611 contacts → |
“STRUCTURAL integrates technology-driven solutions into its industry-leading specialty contracting services.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Mastec Utility Servicesmastec.com HQ: Coral Gables, FL, United StatesReported employees: 1,001-5,000 | Coral Gables, FL, United States | 1,001-5,000 | Exact match | 562 contacts → |
“WE'RE HIRING FOR POWER, GAS, & INFRASTRUCTURE ROLES ACROSS THE COUNTRY!* Join the Team That Keeps Energy and Infrastructure Moving Forward.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Noresconoresco.com HQ: Westborough, MA, United StatesReported employees: 201-500 | Westborough, MA, United States | 201-500 | Exact match | 481 contacts → |
“NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Sitelogiqsitelogiq.com HQ: Minneapolis, MN, United StatesReported employees: 501-1,000 | Minneapolis, MN, United States | 501-1,000 | Exact match | 450 contacts → |
“SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Western Industrial Contractorswesterncon.com HQ: Aurora, CO, United StatesReported employees: 201-500 | Aurora, CO, United States | 201-500 | Exact match | 285 contacts → |
“Western Industrial Contractors (WIC) is a single-source systems integrator, we design, build, and integrate complex industrial systems under one roof, so you manage one…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Palniespalnies.com HQ: Schaumburg, IL, United StatesReported employees: 1,001-5,000 | Schaumburg, IL, United States | 1,001-5,000 | Exact match | 231 contacts → |
“PalniES applies technology to deliver unique, cost-effective engineering and design solutions–-and fast.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Allana Buick & Bers, INCabbae.com HQ: Palo Alto, CA, United StatesReported employees: 201-500 | Palo Alto, CA, United States | 201-500 | Exact match | 229 contacts → |
“Allana Buick & Bers, Inc.(ABB) is a leading Architectural Engineering firm specializing in making buildings perform better by making them energy efficient and longer lasting with…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Robert Derector Associatesderector.com HQ: New York, NY, United StatesReported employees: 51-200 | New York, NY, United States | 51-200 | Exact match | 186 contacts → |
“Robert Derector Associates is a full service engineering firm with a local feel and a global reach.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Mcclure Companymcclureco.com HQ: Harrisburg, PA, United StatesReported employees: 201-500 | Harrisburg, PA, United States | 201-500 | Exact match | 166 contacts → |
“Headquartered in Harrisburg, Pennsylvania, McClure Company is one of the mid-Atlantic's largest, fully integrated mechanical construction, engineering, maintenance and energy…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Voltyxvoltyx.com HQ: Maryland Heights, MO, United StatesReported employees: 201-500 | Maryland Heights, MO, United States | 201-500 | Exact match | 135 contacts → |
“Voltyx is an integrated solutions provider focused on guiding our partners through the complex modernization of the electrical infrastructure through vision, strategy, service…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Willdan Performance Engineeringwilldan.com HQ: Denver, KS, United StatesReported employees: 51-200 | Denver, KS, United States | 51-200 | Exact match | 129 contacts → |
“Willdan Performance Engineering specializes in energy and infrastructure improvement projects through design-build and performance contracting.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Cypress Envirosystemscypressenvirosystems.com HQ: San Jose, CA, United StatesReported employees: 11-50 | San Jose, CA, United States | 11-50 | Exact match | 128 contacts → |
“We Make Buildings Brilliant.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Neal Electric Corpnealelectric.com HQ: Carlsbad, CA, United StatesReported employees: 201-500 | Carlsbad, CA, United States | 201-500 | Exact match | 126 contacts → |
“For over four decades, Neal Electric has been at the forefront of delivering proficient and reliable electrical services across Southern California.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Stronghold Engineeringstrongholdengineering.com HQ: Perris, CA, United StatesReported employees: 51-200 | Perris, CA, United States | 51-200 | Exact match | 103 contacts → |
“Stronghold Engineering (SEI) is an award-winning design and construction firm specializing in renowned projects for some of the nation’s largest organizations.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | 4liberty, INC4liberty.com HQ: San Diego, CA, United StatesReported employees: 51-200 | San Diego, CA, United States | 51-200 | Exact match | 93 contacts → |
“4Liberty is a leading technical & professional services firm focused on energy & infrastructure.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | The Will Groupthewillgroup.com HQ: Chicago, IL, United StatesReported employees: 51-200 | Chicago, IL, United States | 51-200 | Exact match | 93 contacts → |
“What We Do.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | HOUCKhoucks.com HQ: Harrisburg, PA, United StatesReported employees: 201-500 | Harrisburg, PA, United States | 201-500 | Exact match | 84 contacts → |
“Houck has been serving the mid-Atlantic region for over 75 years with offices in Harrisburg and Greencastle, PA.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | TEI Electrical Solutionsteiconst.com HQ: Frederick, MD, United StatesReported employees: 51-200 | Frederick, MD, United States | 51-200 | Exact match | 64 contacts → |
“At TEI our focus is on Electrical Solutions and providing quality workmanship in all aspects of new construction and renovation projects for both the public and private sectors.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | DFS Construction Corporationdfsconstruction.com HQ: Arlington, VA, United StatesReported employees: 51-200 | Arlington, VA, United States | 51-200 | Exact match | 62 contacts → |
“DFS Construction Corporation was founded on the singular principle of being the most responsible construction choice available to our clients.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Taylor & Hilltaylorandhill.com HQ: Texas City, TX, United StatesReported employees: 51-200 | Texas City, TX, United States | 51-200 | Exact match | 62 contacts → |
“Taylor & Hill, Inc.” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | LLI Engineeringlliengineering.com HQ: Pittsburgh, PA, United StatesReported employees: 11-50 | Pittsburgh, PA, United States | 11-50 | Exact match | 54 contacts → |
“Founded in 1910 in Pittsburgh, Pennsylvania, LLI Engineering a veteran owned small business, specializes in commercial, critical facilities, infrastructure upgrades, Green…” Recorded description excerpt · September 17, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 290 company matches
Build a targeted audience, find relevant contacts and export available records to your workflow.
Free signup · 500 credits · limited free results
Retrofit engineering companies: dataset insights
September 17, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
290 records in the displayed employee bands.
0 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 290 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 17, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Questions about this company list
What does Exact match mean for retrofit engineering companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many retrofit engineering companies did RevenueBase find based in the United States?
The saved snapshot records 290 matching company records, 12,176 tracked contacts and 4,957 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 17, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Retrofit engineering companies by geography
- Retrofit engineering companies based in Brazil
- Retrofit engineering companies based in Canada
- Retrofit engineering companies based in France
- Retrofit engineering companies based in Germany
- Retrofit engineering companies based in India
- Retrofit engineering companies based in Italy
- Retrofit engineering companies based in Spain
- Retrofit engineering companies based in the United Kingdom
Cite this list
RevenueBase Data Team. Top 25 retrofit engineering companies based in the United States. Snapshot: September 17, 2026. https://revenuebase.ai/companies/retrofit-engineering-companies/united-states.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Retrofit engineering companies based in Brazil
- Retrofit engineering companies based in Canada
- Retrofit engineering companies based in France
- Retrofit engineering companies based in Germany
- Retrofit engineering companies based in India
- Retrofit engineering companies based in Italy