Company lists · Data refreshed September 2026

Top 25 Retrofit engineering companies worldwide

Name: Retrofit engineering companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 1,165 companies tracked

RevenueBase identified 1,165 retrofit engineering companies worldwide as of September 2026 and tracks 23,044 professional contacts across them, including 7,658 with verified work emails and 0 with mobile numbers. The United States is the largest market and Sao Paulo the largest hub.

This list covers retrofit engineering companies worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 2026. Country and city lists for retrofit engineering companies follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 17, 2026 86% judged on-target in blind review

1,165Companies

23,044Contacts tracked

7,658Verified emails

0Mobile numbers

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The 25 largest retrofit engineering companies worldwide

Ranked by team size

Top 25 of 1,165 retrofit engineering companies worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to retrofit engineering companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Groupe Ponticelli Frères	Indirect evidence	FranceHQ checked Sep 17, 2026	5,001-10,000	1,829 contacts →
	Indirect evidence “The Ponticelli Frères Group is one of the main European service suppliers to companies in the energy (oil and gas, nuclear, renewable energy), industrial (chemical, steelworks…” Source: RevenueBase Database · checked Sep 17, 2026
2	Ameresco	Indirect evidence	Framingham, MA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,383 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
3	NPL Construction CO	Indirect evidence	Phoenix, AZ, United StatesHQ checked Sep 17, 2026	5,001-10,000	1,358 contacts →
	Indirect evidence “NPL is a nationally recognized leader in energy infrastructure construction, with 50 years of experience.” Source: RevenueBase Database · checked Sep 17, 2026
4	Concrejato Engenharia	Partial evidence	São Paulo, BrazilHQ checked Sep 17, 2026	1,001-5,000	765 contacts →
	Partial evidence “Criada na década de 1970, a Concrejato é especializada na execução de serviços técnicos de retrofit e restauro de edificações, recuperação e reforço estrutural, obras industriais…” Source: RevenueBase Database · checked Sep 17, 2026
5	Structural Technologies	Partial evidence	Columbia, MD, United StatesHQ checked Sep 17, 2026	1,001-5,000	658 contacts →
	Partial evidence “STRUCTURAL TECHNOLOGIES develops, markets, and integrates proprietary products with specialty engineering services to improve, protect, and enhance infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
6	Baker Group	Indirect evidence	Ankeny, IA, United StatesHQ checked Sep 17, 2026	1,001-5,000	655 contacts →
	Indirect evidence “Established in 1963, Baker Group is Iowa’s premier full-service specialty contractor-serving commercial, industrial, institutional, and mission-critical markets across the country.” Source: RevenueBase Database · checked Sep 17, 2026
7	CAP Ingelec	Indirect evidence	Mérignac, FranceHQ checked Sep 17, 2026	501-1,000	643 contacts →
	Indirect evidence “Groupe international d’Ingénierie & Réalisation, spécialisé dans les bâtiments complexes, nous assurons principalement des missions clés en main sur des projets de construction…” Source: RevenueBase Database · checked Sep 17, 2026
8	Structural	Indirect evidence	Columbia, MD, United StatesHQ checked Sep 17, 2026	1,001-5,000	611 contacts →
	Indirect evidence “STRUCTURAL integrates technology-driven solutions into its industry-leading specialty contracting services.” Source: RevenueBase Database · checked Sep 17, 2026
9	Mastec Utility Services	Indirect evidence	Coral Gables, FL, United StatesHQ checked Sep 17, 2026	1,001-5,000	562 contacts →
	Indirect evidence “WE'RE HIRING FOR POWER, GAS, & INFRASTRUCTURE ROLES ACROSS THE COUNTRY!* Join the Team That Keeps Energy and Infrastructure Moving Forward.” Source: RevenueBase Database · checked Sep 17, 2026
10	Noresco	Indirect evidence	Westborough, MA, United StatesHQ checked Sep 17, 2026	201-500	481 contacts →
	Indirect evidence “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Source: RevenueBase Database · checked Sep 17, 2026
11	Sitelogiq	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 17, 2026	501-1,000	450 contacts →
	Partial evidence “SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
12	Michels Canada	Indirect evidence	Nisku, AB, CanadaHQ checked Sep 17, 2026	10001+	357 contacts →
	Indirect evidence “Michels Canada is an established contractor, leading the industry with innovative methods in infrastructure, power and energy.” Source: RevenueBase Database · checked Sep 17, 2026
13	Western Industrial Contractors	Indirect evidence	Aurora, CO, United StatesHQ checked Sep 17, 2026	201-500	285 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
14	Vaughn Industries LLC	Indirect evidence	Carey, OH, CanadaHQ checked Sep 17, 2026	501-1,000	269 contacts →
	Indirect evidence “TRADES YOU NEED.” Source: RevenueBase Database · checked Sep 17, 2026
15	Mahendra Realtors & Infrastructure Private Limited	Indirect evidence	Mumbai, IndiaHQ checked Sep 17, 2026	51-200	248 contacts →
	Indirect evidence “M/s.” Source: RevenueBase Database · checked Sep 17, 2026
16	Ecosystem	Indirect evidence	Québec, QC, CanadaHQ checked Sep 17, 2026	201-500	238 contacts →
	Indirect evidence “At Ecosystem, we believe in building meaningful relationships with both our clients and employees.” Source: RevenueBase Database · checked Sep 17, 2026
17	Dalba Engenharia	Indirect evidence	Guarapuava, BrazilHQ checked Sep 17, 2026	1,001-5,000	237 contacts →
	Indirect evidence “Há 20 anos no mercado, construindo caminhos e ampliando horizontes.” Source: RevenueBase Database · checked Sep 17, 2026
18	Palnies	Partial evidence	Schaumburg, IL, United StatesHQ checked Sep 17, 2026	1,001-5,000	231 contacts →
	Partial evidence “PalniES applies technology to deliver unique, cost-effective engineering and design solutions–-and fast.” Source: RevenueBase Database · checked Sep 17, 2026
19	Allana Buick & Bers, INC	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 17, 2026	201-500	229 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
20	Robert Derector Associates	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 2026	51-200	186 contacts →
	Partial evidence “Robert Derector Associates is a full service engineering firm with a local feel and a global reach.” Source: RevenueBase Database · checked Sep 17, 2026
21	Mcclure Company	Partial evidence	Harrisburg, PA, United StatesHQ checked Sep 17, 2026	201-500	166 contacts →
	Partial evidence “Headquartered in Harrisburg, Pennsylvania, McClure Company is one of the mid-Atlantic's largest, fully integrated mechanical construction, engineering, maintenance and energy…” Source: RevenueBase Database · checked Sep 17, 2026
22	Blackeagle Energy Services	Indirect evidence	Berthoud, CO, SwitzerlandHQ checked Sep 17, 2026	201-500	156 contacts →
	Indirect evidence “Blackeagle Energy Services is a general contractor for municipal and private projects.” Source: RevenueBase Database · checked Sep 17, 2026
23	Voltyx	Indirect evidence	Maryland Heights, MO, United StatesHQ checked Sep 17, 2026	201-500	135 contacts →
	Indirect evidence “Voltyx is an integrated solutions provider focused on guiding our partners through the complex modernization of the electrical infrastructure through vision, strategy, service…” Source: RevenueBase Database · checked Sep 17, 2026
24	Vestel Ingenieros	Indirect evidence	Paterna, SpainHQ checked Sep 17, 2026	51-200	135 contacts →
	Indirect evidence “Vestel Ingenieros es una empresa con 20 años de experiencia que tiene el propósito de convertirse en la ingeniería eléctrica nº1 de España.” Source: RevenueBase Database · checked Sep 17, 2026
25	Willdan Performance Engineering	Partial evidence	Denver, KS, United StatesHQ checked Sep 17, 2026	51-200	129 contacts →
	Partial evidence “Willdan Performance Engineering specializes in energy and infrastructure improvement projects through design-build and performance contracting.” Source: RevenueBase Database · checked Sep 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: retrofit engineering companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names retrofit engineering companies.
Partial evidence: Its own public description names part of retrofit engineering companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name retrofit engineering companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,165 retrofit engineering companies worldwide

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Retrofit engineering companies worldwide at a glance

As of Sep 17, 2026

33.2%Verified-email coverage

19.8Average contacts per company

11-50Median size (employees)

4.9%Largest-city concentration · Sao Paulo

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

454

11-50

460

51-200

169

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among retrofit engineering companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: 9 countries, largest first: the United States, Brazil, Italy, India, France, Spain, Germany, Canada, the United Kingdom. Country and city lists for retrofit engineering companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “retrofit engineering companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names retrofit engineering companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among retrofit engineering companies, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 7,658 across the full list. 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.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Retrofit engineering companies by location

9 lists · largest first

Every Retrofit engineering companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names retrofit engineering companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many retrofit engineering companies are there worldwide?

RevenueBase identified 1,165 retrofit engineering companies worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Groupe Ponticelli Frères, headquartered in Worldwide, tops this list with the largest team on record.

Which country has the most retrofit engineering companies?

The United States leads with 290 companies, followed by Brazil (206) and Italy (180). Every retrofit engineering companies list by country and city is linked on this page.

Which city has the most retrofit engineering companies?

Sao Paulo leads with 57 headquartered companies, followed by Belo Horizonte (16) and Rio De Janeiro (15).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 7,658 verified decision-maker contacts tracked across these 1,165 companies.

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.

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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 Smart Search, 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.