Company lists · Data refreshed November 2026

Top 20 Specialized engineering consultants based in Fairfax, United States

Name: Specialized engineering consultants based in Fairfax, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 48 companies tracked

RevenueBase identified 48 company matches for specialized engineering consultants associated with Fairfax, United States as of November 2026 and tracks 938 professional contacts across them, including 290 with verified work emails. Across the United States, Houston is the largest hub for this category (638 companies); Fairfax has 48.

This list covers company matches for specialized engineering consultants associated with Fairfax, 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 November 6, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

48Companies

938Contacts tracked

290Verified emails

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The 20 largest specialized engineering consultants based in Fairfax, United States

Ranked by team size

Top 20 of 48 company matches for specialized engineering consultants based in Fairfax, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	PEG	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	201-500	223 contacts →
	Exact match “PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Mcking Consulting	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	51-200	124 contacts →
	Exact match “McKing Consulting Corporation provides a variety of general and specialized management consulting services to the federal government, state agencies, nonprofits, and public and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Widelity, INC	Exact match	Fairfax, United StatesHQ recorded Nov 6, 2026	51-200	108 contacts →
	Exact match “Founded in 2006, Widelity is a leading provider of business and network engineering consulting to global technology driven industries.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Adtek Engineers	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	51-200	73 contacts →
	Exact match “ADTEK Engineers, Inc.(ADTEK), founded in 1987, is a consulting firm with more than 50 design professionals firm-wide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	ERPI	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	201-500	61 contacts →
	Exact match “Enterprise Resource Performance Inc.(ERPi) is a professional services rm that delivers strategic, advisory, technological, and implementation support services to Federal Agencies.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	DDG Virginia Engineering, PC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	11-50	22 contacts →
	Exact match “DDG Virginia specializes in mechanical, electrical, plumbing and fire protection system design.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Mckeever Services Corporation	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	11-50	22 contacts →
	Exact match “For over 50 years McKeever Services Corporation has provided Permit Management and Preconstruction Consulting Services, Geotechnical Engineering, Inspections and Testing Services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Land Development Consultants, INC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	1-10	16 contacts →
	Exact match “Land Development Consultants provides Civil Engineering, Land Planning and Surveying Services to Private and Public Sector clients in Virginia, Maryland and the Washington D.C.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Gauthier, Alvarado & Associates, INC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	11-50	11 contacts →
	Exact match “Gauthier, Alvarado & Associates was founded in 1975 on the strength of a single idea.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Symposit LLC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	11-50	11 contacts →
	Exact match “Symposit LLC is an advisory management firm that specializes in leveraging information technology (IT) to provide value to it's clients by optimizing operations, reducing risk…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Aspire Engineering	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	1-10	10 contacts →
	Exact match “Aspire Engineering is a consulting engineering firm located in Washington, DC metropolitan area that provides Mechanical, Electrical, Plumbing, and Fire Protection Engineering…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Vanguard Management Solutions, INC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	11-50	9 contacts →
	Exact match “Vanguard Management Solutions (VMGTS) is a minority-owned cybersecurity and technology firm serving government and commercial organizations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Klein Engineering, PSC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	1-10	8 contacts →
	Exact match “Klein Engineering is a professional services corporation (PSC) established in San Juan, Puerto Rico, since January, 2007, and operating in the Commonwealth of Virginia since 2014.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Geoenv Engineers	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	11-50	7 contacts →
	Exact match “GeoEnv Engineers LLC is a SWaM certified civil engineering firm based in Fairfax, Virginia, dedicated to delivering land development, residential design, and water resources…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Enegis	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	1-10	7 contacts →
	Exact match “Enegis is an energy consulting firm that focuses on strategy, technology, economics, and project development.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	BEI Structural Engineers, INC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	11-50	4 contacts →
	Exact match “BEI Structural Engineers is a structural consulting company located in 3930 Pender Dr # 175, Fairfax, Virginia, United States.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Contech-Ca	Exact match	Fairfax, CA, United StatesHQ recorded Nov 6, 2026	1-10	4 contacts →
	Exact match “We focus on delivering the best outcomes for our clients, by drawing on our deep engineering experience ConTech-CA is led by Managing Principal, John Griffiths PE John Griffiths…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Excelsior Consulting Group, LLC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	11-50	4 contacts →
	Exact match “Excelsior Consulting Group LLC is a Woman and Minority owned SBA 8(m) business with a pending application for SBA 8(a) certification.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	The Quiah Group, LLC	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	1-10	4 contacts →
	Exact match “Quiah Group is a consulting firm that delivers expert, objective insights, a tailored approach and unparalleled collaboration to help leaders.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Architectural Design And Consulting Services	Exact match	Fairfax, VA, United StatesHQ recorded Nov 6, 2026	1-10	2 contacts →
	Exact match “Architectural Design + Consulting Services, LLC (ADCS) was officially launched in 2010 under the original company name of "Sustainable Architecture”.” Recorded in the RevenueBase company graph · Nov 6, 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 “specialized engineering consultants”. 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 20 of 48 specialized engineering consultants based in Fairfax, United States

See the full list, filter by size, metro and specialty, and access 290 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Specialized engineering consultants based in Fairfax, United States at a glance

As of Nov 6, 2026

30.9%Verified-email coverage

19.5Average contacts per company

1-10Median size (employees)

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for Fairfax, so it is reported there. Company counts and contact totals on this page are exact for Fairfax, over 48 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 Fairfax, United States whose business descriptions match “specialized engineering consultants” 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 290 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 November 6, 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.

Specialized engineering consultants by metro in the United States

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 “specialized engineering consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many specialized engineering consultants are there based in Fairfax, United States?

RevenueBase identified 48 company matches for specialized engineering consultants associated with Fairfax, United States as of November 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?

PEG tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most specialized engineering consultants?

Houston leads the United States with 638 company records, followed by New York (638) and Austin (273). Fairfax has 48.

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 290 professional contacts with verified work emails tracked across these 48 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 November 6, 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 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.