Company lists · Data refreshed September 2026

Top 25 Carbon neutral contractors worldwide

Name: Carbon neutral contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 39,190 companies tracked

RevenueBase identified 39,190 carbon neutral contractors worldwide as of September 2026 and tracks 617,421 professional contacts across them, including 217,010 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers carbon neutral contractors 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 16, 2026. Country and city lists for carbon neutral contractors 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 16, 2026 86% judged on-target in blind review

39,190Companies

617,421Contacts tracked

217,010Verified emails

0Mobile numbers

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The 25 largest carbon neutral contractors worldwide

Ranked by team size

Top 25 of 39,190 carbon neutral contractors worldwide, 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	Arcadis	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 16, 2026	10001+	33,846 contacts →
	Indirect evidence “Arcadis is a leading global partner, delivering transformative projects with businesses, cities and industries.” Source: RevenueBase Database · checked Sep 16, 2026
2	Stantec	Indirect evidence	Edmonton, AB, CanadaHQ checked Sep 16, 2026	10001+	28,416 contacts →
	Indirect evidence “Stantec empowers clients, people, and communities to rise to the world’s greatest challenges at a time when the world faces more unprecedented concerns than ever before.” Source: RevenueBase Database · checked Sep 16, 2026
3	SWECO	Indirect evidence	Stockholm, SwedenHQ checked Sep 16, 2026	10001+	18,445 contacts →
	Indirect evidence “Sweco is at the heart of the green transition - planning and designing the sustainable communities and cities of the future.” Source: RevenueBase Database · checked Sep 16, 2026
4	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
5	ERM	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	5,001-10,000	9,119 contacts →
	Indirect evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 16, 2026
6	COWI	Indirect evidence	Lyngby, DenmarkHQ checked Sep 16, 2026	5,001-10,000	7,438 contacts →
	Indirect evidence “Together with customers, partners and colleagues, we shape a future where people and societies grow and flourish.” Source: RevenueBase Database · checked Sep 16, 2026
7	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
8	SLR Consulting	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	3,848 contacts →
	Indirect evidence “SLR is a committed partner in our clients’ sustainability journeys.” Source: RevenueBase Database · checked Sep 16, 2026
9	Drees & Sommer	Indirect evidence	Stuttgart, GermanyHQ checked Sep 16, 2026	5,001-10,000	3,475 contacts →
	Indirect evidence “Uniting opposites to create a world we want to live in Drees & Sommer is a partner-managed, global consulting company providing a single source of consultation and implementation…” Source: RevenueBase Database · checked Sep 16, 2026
10	Julius Berger Nigeria PLC	Indirect evidence	Utako, NigeriaHQ checked Sep 16, 2026	10001+	3,347 contacts →
	Indirect evidence “Julius Berger Nigeria Plc is a leading construction company offering integrated construction solutions and related services.” Source: RevenueBase Database · checked Sep 16, 2026
11	KEO International Consultants	Indirect evidence	Safat, KuwaitHQ checked Sep 16, 2026	1,001-5,000	3,038 contacts →
	Indirect evidence “From shaping iconic skylines to crafting sustainable communities, KEO builds legacies for a better tomorrow.” Source: RevenueBase Database · checked Sep 16, 2026
12	Gleeds	Indirect evidence	Americas, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,874 contacts →
	Indirect evidence “We’re not just a construction consultancy, we're a catalyst for change.” Source: RevenueBase Database · checked Sep 16, 2026
13	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
14	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
15	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
16	Redcon Construction Co. S.A.E	Indirect evidence	Heliopolis, EgyptHQ checked Sep 16, 2026	1,001-5,000	2,731 contacts →
	Indirect evidence “They say that the moment of truth for construction companies comes with age, passing the 20 years of age in this business is a landmark, also, a sign of maturity and solid…” Source: RevenueBase Database · checked Sep 16, 2026
17	NIRAS	Indirect evidence	Allerød, DenmarkHQ checked Sep 16, 2026	1,001-5,000	2,699 contacts →
	Indirect evidence “At NIRAS, we engineer solutions for a shared future.” Source: RevenueBase Database · checked Sep 16, 2026
18	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
19	TYPSA	Indirect evidence	San Sebastian De Los Reyes, SpainHQ checked Sep 16, 2026	1,001-5,000	2,422 contacts →
	Indirect evidence “TYPSA is an independent consulting and engineering services group, and a leader in infrastructure, energy, environmental and city solutions.” Source: RevenueBase Database · checked Sep 16, 2026
20	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
21	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
22	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
23	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
24	YIT	Indirect evidence	Helsinki, FinlandHQ checked Sep 16, 2026	1,001-5,000	1,969 contacts →
	Indirect evidence “We build and develop sustainable living environments: functional and attractive homes, future-proof public and commercial buildings, infrastructure to support the green transition…” Source: RevenueBase Database · checked Sep 16, 2026
25	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

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 39,190 carbon neutral contractors worldwide

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Carbon neutral contractors worldwide at a glance

As of Sep 16, 2026

35.1%Verified-email coverage

15.8Average contacts per company

1-10Median size (employees)

1.4%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

23,060

11-50

11,661

51-200

3,085

201-500

680

501-1,000

214

1,001-5,000

160

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 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.
Coverage: 70 countries, largest first: the United States, Germany, France, Brazil, India, the United Kingdom, Italy, Spain, the Netherlands, Canada and 60 more. Country and city lists for carbon neutral contractors are linked below.
What qualifies: Companies worldwide 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.
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, 217,010 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 location

179 lists · largest first

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

Countries

Cities

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 worldwide?

RevenueBase identified 39,190 carbon neutral contractors 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?

Arcadis, headquartered in Amsterdam, tops this list with the largest team on record.

Which country has the most carbon neutral contractors?

The United States leads with 6,039 companies, followed by Germany (2,680) and France (2,588). Every carbon neutral contractors list by country and city is linked on this page.

Which city has the most carbon neutral contractors?

London leads with 544 headquartered companies, followed by Sao Paulo (414) and Paris (302).

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 217,010 verified decision-maker contacts tracked across these 39,190 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.