Company lists · Data refreshed September 2026

Top 25 Carbon neutral contractors based in the United States

Name: Carbon neutral 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 6,039 companies tracked

RevenueBase identified 6,039 carbon neutral contractors headquartered in the United States as of September 2026 and tracks 146,485 professional contacts across them, including 68,416 with verified work emails. New York is the largest hub.

This list covers carbon neutral 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

6,039Companies

146,485Contacts tracked

68,416Verified emails

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The 25 largest carbon neutral contractors based in the United States

Ranked by team size

Top 25 of 6,039 carbon neutral 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 carbon neutral 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	WSP In The U.S	Indirect evidence	New York, NY, United StatesHQ checked Sep 16, 2026	10001+	9,318 contacts →
	Indirect evidence “What if you could shape built and natural environments – and the future of those that use them?” Source: RevenueBase Database · checked Sep 16, 2026
2	TRC Companies, INC	Indirect evidence	Windsor, CT, United StatesHQ checked Sep 16, 2026	5,001-10,000	7,017 contacts →
	Indirect evidence “TRC, a member of WSP, stands for adaptability.” Source: RevenueBase Database · checked Sep 16, 2026
3	BL Harbert International LLC	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 16, 2026	5,001-10,000	2,818 contacts →
	Indirect evidence “BL Harbert International, LLC began construction operations in under the leadership of Billy Harbert, Jr, carrying on a family tradition in the construction industry dating back…” Source: RevenueBase Database · checked Sep 16, 2026
4	Dewberry	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,795 contacts →
	Indirect evidence “Dewberry is a leading, market-facing firm with a proven history of providing professional services to a wide variety of public- and private-sector clients.” Source: RevenueBase Database · checked Sep 16, 2026
5	FTI	Indirect evidence	Menasha, WI, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,741 contacts →
	Indirect evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 16, 2026
6	APTIM	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,639 contacts →
	Indirect evidence “APTIM enhances the quality of the environment, wellbeing of people, resilience of communities, and opportunity for employees to make a difference, not just a living.” Source: RevenueBase Database · checked Sep 16, 2026
7	MOSS	Indirect evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 16, 2026	5,001-10,000	2,214 contacts →
	Indirect evidence “Moss is a national, privately-held construction firm providing innovative solutions resulting in award-winning projects.” Source: RevenueBase Database · checked Sep 16, 2026
8	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
9	DLR Group	Indirect evidence	30 Offices, MN, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,992 contacts →
	Indirect 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
10	IMEG	Indirect evidence	Rock Island, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,985 contacts →
	Indirect evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 16, 2026
11	Salas O'brien	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,843 contacts →
	Indirect evidence “Salas O’Brien is an employee-owned engineering and technical services firm focused on advancing the human experience through the built environment.” Source: RevenueBase Database · checked Sep 16, 2026
12	Westwood Professional Services	Indirect evidence	Plano, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,661 contacts →
	Indirect evidence “At Westwood, our purpose is to create a better world for people through our work.” Source: RevenueBase Database · checked Sep 16, 2026
13	Swca Environmental Consultants	Indirect evidence	Phoenix, AZ, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,629 contacts →
	Indirect evidence “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Source: RevenueBase Database · checked Sep 16, 2026
14	CRB	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,553 contacts →
	Indirect evidence “CRB designs and builds the facilities that help bring life-enhancing therapies, critical medicines, and essential products to people around the world.” Source: RevenueBase Database · checked Sep 16, 2026
15	Structure Tone	Indirect evidence	NY, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,299 contacts →
	Indirect evidence “Structure Tone was founded in 1971 in NYC, as an interior construction focused builder.” Source: RevenueBase Database · checked Sep 16, 2026
16	Atwell, LLC	Indirect evidence	Southfield, MI, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,290 contacts →
	Indirect evidence “Atwell is a full-service consulting, engineering and construction services firm that delivers a broad range of creative solutions to clients in the real estate and land…” Source: RevenueBase Database · checked Sep 16, 2026
17	Pennoni	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,264 contacts →
	Indirect evidence “Since our founding more than five decades ago, our clients trust Pennoni’s commitment to elevating the impact of projects on our communities.” Source: RevenueBase Database · checked Sep 16, 2026
18	Halcrow	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 16, 2026	10001+	1,256 contacts →
	Indirect evidence “Halcrow is now Jacobs.” Source: RevenueBase Database · checked Sep 16, 2026
19	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
20	The Beck Group	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 16, 2026	501-1,000	1,054 contacts →
	Indirect evidence “We integrate architecture, construction, sustainability, and technology to transform how our clients design and build.” Source: RevenueBase Database · checked Sep 16, 2026
21	S&me	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,034 contacts →
	Indirect evidence “We are S & ME.” Source: RevenueBase Database · checked Sep 16, 2026
22	Affiliated Engineers, INC	Indirect evidence	Madison, WI, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,012 contacts →
	Indirect 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
23	Wanzek Construction, Inc., A Mastec Company	Partial evidence	Fargo, ND, United StatesHQ checked Sep 16, 2026	1,001-5,000	933 contacts →
	Partial evidence “Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.” Source: RevenueBase Database · checked Sep 16, 2026
24	Parametrix	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 16, 2026	501-1,000	880 contacts →
	Indirect evidence “At Parametrix, we help our clients imagine what's possible.” Source: RevenueBase Database · checked Sep 16, 2026
25	Introba	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 16, 2026	1,001-5,000	822 contacts →
	Indirect 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

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: carbon neutral 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 carbon neutral contractors.
Partial evidence: Its own public description names part of carbon neutral contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name carbon neutral 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 6,039 carbon neutral contractors based in the United States

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Carbon neutral contractors based in the United States at a glance

As of Sep 16, 2026

46.7%Verified-email coverage

24.3Average contacts per company

1-10Median size (employees)

4.4%Largest-city concentration · New York

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

3,593

11-50

1,788

51-200

471

201-500

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 6,039 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 carbon neutral 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 “carbon neutral 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 carbon neutral 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 carbon neutral 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, 68,416 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.

Carbon neutral 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 carbon neutral 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 carbon neutral contractors are there based in the United States?

RevenueBase identified 6,039 carbon neutral 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?

WSP In The U.S, headquartered in New York, tops this list with the largest team on record.

Which city has the most carbon neutral contractors?

New York leads with 264 headquartered companies, followed by Houston (106) and Los Angeles (106).

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 68,416 verified decision-maker contacts tracked across these 6,039 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.