Company lists · Data refreshed November 2026

Top 25 Building systems contractors based in the United States

Name: Building systems contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 13,163 companies tracked

RevenueBase identified 13,163 company matches for building systems contractors associated with the United States as of November 2026 and tracks 263,922 professional contacts across them, including 93,914 with verified work emails. Houston is the largest hub.

This list covers company matches for building systems contractors 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 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

13,163Companies

263,922Contacts tracked

93,914Verified emails

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The 25 largest building systems contractors based in the United States

Ranked by team size

Top 25 of 13,163 company matches for building systems contractors based in the 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	Gilbane Building	Exact match	Providence, RI, United StatesHQ recorded Nov 6, 2026	1,001-5,000	4,383 contacts →
	Exact match “Gilbane Building Company provides a full slate of construction and facilities-related services-from preconstruction services planning and integrated consulting capabilities to…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Southland Industries	Exact match	Garden Grove, MD, United StatesHQ recorded Nov 6, 2026	10001+	3,122 contacts →
	Exact match “As one of the nation's largest building systems experts, Southland Industries provides innovative, practical results for your engineering, construction, service, and energy needs.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Cleaning Services Group	Exact match	Danvers, MA, United StatesHQ recorded Nov 6, 2026	n/a	2,743 contacts →
	Exact match “Cleaning Services Group, Inc.(CSG) is a multi-faceted, national building services company dedicated to providing our clients with cost effective cleaning and maintenance solutions…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Acco Engineered Systems	Exact match	Pasadena, CA, United StatesHQ recorded Nov 6, 2026	5,001-10,000	2,633 contacts →
	Exact match “Since 1934, owners and builders have selected ACCO Engineered Systems to design, install, and maintain more than mechanical projects.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Hitt Contracting INC	Exact match	Falls Church, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,603 contacts →
	Exact match “HITT Contracting provides a wide range of construction services across the nation, from complex core and shell buildings and renovations to interior fit-outs and routine service…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	GCA Services Group	Exact match	NY, United StatesHQ recorded Nov 6, 2026	10001+	2,546 contacts →
	Exact match “ABM (NYSE: ABM) is a Fortune 500 company and leading provider of facility solutions with offices throughout the United States and various international locations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	American Residential Services	Exact match	Memphis, NC, United StatesHQ recorded Nov 6, 2026	5,001-10,000	2,013 contacts →
	Exact match “American Residential Services (ARS®/Rescue Rooter®) is one of the nation’s largest providers of heating, air conditioning, indoor air quality, plumbing, drain cleaning…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Tdindustries, INC	Exact match	Dallas, AZ, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,002 contacts →
	Exact match “TDIndustries delivers a comprehensive approach to Facility Services and Mechanical Construction.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Service Experts	Exact match	Richardson, NY, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,552 contacts →
	Exact match “Service Experts is North America's leading HVAC, Plumbing & Electrical company with 75+ locations nationwide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Emcor Group, INC	Exact match	Norwalk, CT, United StatesHQ recorded Nov 6, 2026	10001+	1,493 contacts →
	Exact match “A Fortune 500® company and a member of the S&P 500, EMCOR Group, Inc.(NYSE: EME) is a leader in mechanical and electrical construction, industrial and energy infrastructure, and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Macdonald-Miller Facility Solutions	Exact match	Seatac, WA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,424 contacts →
	Exact match “MacDonald-Miller Facility Solutions is a full-service, design-build mechanical contractor in the Pacific Northwest.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Comfort Systems USA	Exact match	Houston, IN, United StatesHQ recorded Nov 6, 2026	10001+	1,407 contacts →
	Exact match “Comfort Systems USA \| Quality People.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Facility Solutions Group	Exact match	Austin, KS, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,345 contacts →
	Exact match “Big jobs, complex systems, tight timelines.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Bergelectric	Exact match	Carlsbad, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,236 contacts →
	Exact match “Since their inception in 1946, Bergelectric has made its mark on the construction industry by providing the highest quality electrical and technology contracting.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Mckenney's, INC	Exact match	Atlanta, NC, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,143 contacts →
	Exact match “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Henderson Engineers	Exact match	Lenexa, TX, United StatesHQ recorded Nov 6, 2026	501-1,000	1,124 contacts →
	Exact match “Henderson Engineers is a national building systems design firm with a wide array of engineering services and a portfolio representing a full range of markets including business…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	GSH Group	Exact match	Parsippany, NJ, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,075 contacts →
	Exact match “GSH Group is a premier provider of global integrated facilities management and building engineering services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	LEE Company	Exact match	Franklin, TN, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,067 contacts →
	Exact match “Since 1944, we’ve been family-owned and family-focused, built on values that last and a mission that matters.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Harris	Exact match	St. Paul, ID, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,055 contacts →
	Exact match “Harris is a leading national mechanical contractor specializing in design and engineering, construction, controls, service, manufacturing, conveyors and end-to-end building…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Cmta, INC	Exact match	Louisville, TN, United StatesHQ recorded Nov 6, 2026	501-1,000	1,049 contacts →
	Exact match “CMTA is part of Legence, a Nasdaq Listed company.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Stellar	Exact match	Jacksonville, FL, United StatesHQ recorded Nov 6, 2026	501-1,000	941 contacts →
	Exact match “Stellar, headquartered in Jacksonville, Florida, is a fully integrated firm focusing on design, engineering, construction, refrigeration, and mechanical and electrical services…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Archkey Solutions	Exact match	St. Louis, MO, United StatesHQ recorded Nov 6, 2026	1,001-5,000	928 contacts →
	Exact match “ArchKey, one of the largest privately held specialty trade installation and facilities services companies in the United States, is a leader in designing, building, and maintaining…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	AHERN	Exact match	Fond Du Lac, WI, United StatesHQ recorded Nov 6, 2026	1,001-5,000	915 contacts →
	Exact match “Ahern is a mechanical and fire protection contractor specializing in HVAC, Plumbing, Building Controls, Sprinkler, Extinguisher & Alarm and Fabrication for construction and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Marsden Services	Exact match	St. Paul, MN, United StatesHQ recorded Nov 6, 2026	5,001-10,000	836 contacts →
	Exact match “Established in 1952 by Skip Marsden, Marsden Services is one of the largest privately-held facility services organizations in the United States.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Encore Fire Protection	Exact match	Pawtucket, NH, United StatesHQ recorded Nov 6, 2026	1,001-5,000	786 contacts →
	Exact match “When life safety is on the line, you need more than just equipment-you need a team you can trust.” 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 “building systems contractors”. 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 13,163 building systems contractors based in the United States

See the full list, filter by size, metro and specialty, and access 93,914 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Building systems contractors based in the United States at a glance

As of Nov 6, 2026

35.6%Verified-email coverage

20.1Average contacts per company

11-50Median size (employees)

1.3%Largest-city concentration · Houston

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

4,957

11-50

5,127

51-200

2,155

201-500

487

501-1,000

157

1,001-5,000

114

5,001-10,000

10001+

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 13,163 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 “building systems contractors” 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 93,914 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.

Building systems contractors by metro

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 “building systems contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many building systems contractors are there based in the United States?

RevenueBase identified 13,163 company matches for building systems contractors associated with the 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?

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

Which city has the most building systems contractors?

Houston leads with 176 company records, followed by New York (169) and Phoenix (92).

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 93,914 professional contacts with verified work emails tracked across these 13,163 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.