Company lists · Data refreshed September 2026

Top 25 Green building system contractors based in the United States

Name: Green building system contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 2,922 companies tracked

RevenueBase identified 2,922 green building system contractors headquartered in the United States as of September 2026 and tracks 72,605 professional contacts across them, including 33,530 with verified work emails. New York is the largest hub.

This list covers green building system contractors headquartered in the United States, 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 16, 2026.

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 16, 2026 86% judged on-target in blind review

2,922Companies

72,605Contacts tracked

33,530Verified emails

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The 25 largest green building system contractors based in the United States

Ranked by team size

Top 25 of 2,922 green building system contractors based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to green building system contractors: 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	Southland Industries	Strong evidence	Garden Grove, CA, United StatesHQ checked Sep 16, 2026	10001+	2,439 contacts →
	Strong evidence “As one of the nation's largest building systems experts, Southland Industries provides innovative, practical results for your engineering, construction, service, and energy needs.” Source: RevenueBase Database · checked Sep 16, 2026
2	Mckinstry	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,213 contacts →
	Indirect evidence “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Source: RevenueBase Database · checked Sep 16, 2026
3	DLR Group	Partial evidence	30 Offices, MN, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,992 contacts →
	Partial evidence “DLR Group is an integrated design firm delivering architecture, engineering, interiors, planning, and building optimization for new construction, renovation, and adaptive reuse.” Source: RevenueBase Database · checked Sep 16, 2026
4	Emcor Group, INC	Indirect evidence	Norwalk, CT, United StatesHQ checked Sep 16, 2026	10001+	1,383 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 16, 2026
5	OLA	Indirect evidence	Austin, TX, United StatesHQ checked Sep 16, 2026	n/a	1,145 contacts →
	Indirect evidence “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Source: RevenueBase Database · checked Sep 16, 2026
6	Mckenney's, INC	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,077 contacts →
	Indirect evidence “McKenney’s is the Southeast’s most trusted name in facility construction, operation and maintenance.” Source: RevenueBase Database · checked Sep 16, 2026
7	Henderson Engineers	Strong evidence	Lenexa, KS, United StatesHQ checked Sep 16, 2026	501-1,000	1,040 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 16, 2026
8	Affiliated Engineers, INC	Partial evidence	Madison, WI, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,012 contacts →
	Partial evidence “Affiliated Engineers, Inc.(AEI) provides engineering leadership and whole-mission solutions for complex building, energy, and utility projects.” Source: RevenueBase Database · checked Sep 16, 2026
9	Cmta, INC	Indirect evidence	Louisville, KY, United StatesHQ checked Sep 16, 2026	501-1,000	936 contacts →
	Indirect evidence “CMTA is part of Legence, a Nasdaq Listed company.” Source: RevenueBase Database · checked Sep 16, 2026
10	Climatec, LLC	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 16, 2026	1,001-5,000	863 contacts →
	Partial evidence “Climatec has been making buildings safer, more comfortable and efficient for over 40 years.” Source: RevenueBase Database · checked Sep 16, 2026
11	Introba	Partial evidence	St Louis, MO, United StatesHQ checked Sep 16, 2026	1,001-5,000	822 contacts →
	Partial evidence “Introba is one of the world’s largest building engineering and consulting firms with more than employees in offices across the United States, Canada, the United Kingdom, Serbia…” Source: RevenueBase Database · checked Sep 16, 2026
12	Syska Hennessy Group	Indirect evidence	New York, United StatesHQ checked Sep 16, 2026	501-1,000	803 contacts →
	Indirect evidence “Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.” Source: RevenueBase Database · checked Sep 16, 2026
13	Limbach	Partial evidence	Tampa, FL, United StatesHQ checked Sep 16, 2026	1,001-5,000	745 contacts →
	Partial evidence “Limbach is a leading building solutions firm delivering mission critical infrastructure that supports life’s most important moments.” Source: RevenueBase Database · checked Sep 16, 2026
14	PAE	Partial evidence	Portland, OR, United StatesHQ checked Sep 16, 2026	201-500	744 contacts →
	Partial evidence “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Source: RevenueBase Database · checked Sep 16, 2026
15	Kinetics	Strong evidence	Livermore, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	734 contacts →
	Strong evidence “Founded in 1973, Kinetics is a full-service process and mechanical contractor specializing in the design and installation of process, mechanical, plumbing and HVAC systems.” Source: RevenueBase Database · checked Sep 16, 2026
16	Albireo Energy	Partial evidence	Edison, NJ, United StatesHQ checked Sep 16, 2026	1,001-5,000	669 contacts →
	Partial evidence “Albireo Energy is a leading independent building controls and energy services provider recognized by customers for creating intelligent, high-performance buildings.” Source: RevenueBase Database · checked Sep 16, 2026
17	F.E. Moran Group Of Companies	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	564 contacts →
	Indirect evidence “At F.E.” Source: RevenueBase Database · checked Sep 16, 2026
18	Vanderweil Engineers	Indirect evidence	Boston, MA, United StatesHQ checked Sep 16, 2026	201-500	545 contacts →
	Indirect evidence “Vanderweil is a mechanical, electrical, plumbing, fire protection, technology, sustainability, commissioning, and power engineering firm dedicated to providing customized and…” Source: RevenueBase Database · checked Sep 16, 2026
19	Therma	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	482 contacts →
	Indirect evidence “Therma is part of Legence, a Blackstone portfolio company, specially created to be an Energy Transition Accelerator™.” Source: RevenueBase Database · checked Sep 16, 2026
20	MSS Solutions, LLC	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 16, 2026	501-1,000	470 contacts →
	Indirect evidence “Since 1996, MSS has made thousands of facilities more efficient, comfortable, secure and reliable for owners, operators and occupiers across the Carolinas and throughout North…” Source: RevenueBase Database · checked Sep 16, 2026
21	Pe-Services	Indirect evidence	Lebanon, OH, United StatesHQ checked Sep 16, 2026	n/a	455 contacts →
	Indirect evidence “PE-Services provides engineering for your success.” Source: RevenueBase Database · checked Sep 16, 2026
22	Long Building Technologies	Strong evidence	Littleton, CO, United StatesHQ checked Sep 16, 2026	501-1,000	453 contacts →
	Strong evidence “Since 1965, LONG has been in the business of building performance; making them automated, efficient, green, and safe.” Source: RevenueBase Database · checked Sep 16, 2026
23	Sitelogiq	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 16, 2026	501-1,000	450 contacts →
	Indirect evidence “SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Source: RevenueBase Database · checked Sep 16, 2026
24	John W. Danforth Company	Indirect evidence	Tonawanda, NY, United StatesHQ checked Sep 16, 2026	501-1,000	415 contacts →
	Indirect evidence “We are powered by the best people in the industry.” Source: RevenueBase Database · checked Sep 16, 2026
25	UMC	Partial evidence	Lynnwood, WA, United StatesHQ checked Sep 16, 2026	201-500	393 contacts →
	Partial evidence “UMC helps clients solve the complex challenges of built environments and their systems.” Source: RevenueBase Database · checked Sep 16, 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: green building system contractors. 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 green building system contractors.
Partial evidence: Its own public description names part of green building system contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name green building system contractors. 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 2,922 green building system contractors based in the United States

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Green building system contractors based in the United States at a glance

As of Sep 16, 2026

46.2%Verified-email coverage

24.8Average contacts per company

11-50Median size (employees)

2.8%Largest-city concentration · New York

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

1,290

11-50

1,040

51-200

426

201-500

103

501-1,000

1,001-5,000

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 2,922 companies.

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 green building system contractors, 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “green building system contractors”. 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 green building system contractors), 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 green building system contractors, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 33,530 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 16, 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.

Green building system contractors by metro

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 green building system contractors, 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 green building system contractors are there based in the United States?

RevenueBase identified 2,922 green building system contractors headquartered in the United States 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?

Southland Industries, headquartered in Garden Grove, tops this list with the largest team on record.

Which city has the most green building system contractors?

New York leads with 82 headquartered companies, followed by Houston (40) and Denver (29).

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 33,530 verified decision-maker contacts tracked across these 2,922 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 16, 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.