Company lists · Data refreshed September 2026

Top 25 Sustainable design firms worldwide

Name: Sustainable design firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 42,301 companies tracked

RevenueBase identified 42,301 sustainable design firms worldwide as of September 2026 and tracks 593,064 professional contacts across them, including 210,217 with verified work emails. The United States is the largest market and London the largest hub.

This list covers sustainable design firms 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 22, 2026. Country and city lists for sustainable design firms 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 22, 2026 86% judged on-target in blind review

42,301Companies

593,064Contacts tracked

210,217Verified emails

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The 25 largest sustainable design firms worldwide

Ranked by team size

Top 25 of 42,301 sustainable design firms worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable design firms: 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 22, 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 22, 2026
2	Stantec	Indirect evidence	Edmonton, AB, CanadaHQ checked Sep 22, 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 22, 2026
3	SWECO	Strong evidence	Stockholm, SwedenHQ checked Sep 22, 2026	10001+	18,445 contacts →
	Strong 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 22, 2026
4	Ramboll	Indirect evidence	Copenhagen, DenmarkHQ checked Sep 22, 2026	10001+	15,715 contacts →
	Indirect evidence “Ramboll is a global architecture, engineering and consultancy company founded in Denmark in 1945.” Source: RevenueBase Database · checked Sep 22, 2026
5	DAR	Strong evidence	Beirut, LebanonHQ checked Sep 22, 2026	10001+	10,822 contacts →
	Strong evidence “Dar is one of the world’s leading consultancies, providing design, planning, engineering, sustainability consulting, digital solutions and services, project management, and…” Source: RevenueBase Database · checked Sep 22, 2026
6	WSP In The U.S	Indirect evidence	New York, NY, United StatesHQ checked Sep 22, 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 22, 2026
7	ERM	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	5,001-10,000	9,119 contacts →
	Partial evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 22, 2026
8	Khatib & Alami	Partial evidence	Downtown, PolandHQ checked Sep 22, 2026	5,001-10,000	5,792 contacts →
	Partial evidence “Khatib & Alami (K&A) is a multidisciplinary design consultancy which operates primarily across the Middle East & Africa, Levant, Central and South-East Asia, and Europe.” Source: RevenueBase Database · checked Sep 22, 2026
9	SLR Consulting	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1,001-5,000	3,848 contacts →
	Partial evidence “SLR is a committed partner in our clients’ sustainability journeys.” Source: RevenueBase Database · checked Sep 22, 2026
10	Drees & Sommer	Indirect evidence	Stuttgart, GermanyHQ checked Sep 22, 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 22, 2026
11	KEO International Consultants	Partial evidence	Safat, KuwaitHQ checked Sep 22, 2026	1,001-5,000	3,038 contacts →
	Partial evidence “From shaping iconic skylines to crafting sustainable communities, KEO builds legacies for a better tomorrow.” Source: RevenueBase Database · checked Sep 22, 2026
12	Perkins&will	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,958 contacts →
	Partial evidence “Since 1935, we’ve believed that design has the power to make the world a better, more beautiful place.” Source: RevenueBase Database · checked Sep 22, 2026
13	Gleeds	Indirect evidence	Americas, United StatesHQ checked Sep 22, 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 22, 2026
14	Foster Partners	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	1,001-5,000	2,869 contacts →
	Strong evidence “Foster + Partners is a global studio for architecture, urbanism and design, all rooted in sustainability and founded by Norman Foster in 1967.” Source: RevenueBase Database · checked Sep 22, 2026
15	NIRAS	Indirect evidence	Allerød, DenmarkHQ checked Sep 22, 2026	1,001-5,000	2,699 contacts →
	Indirect evidence “At NIRAS, we engineer solutions for a shared future.” Source: RevenueBase Database · checked Sep 22, 2026
16	HOK	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,614 contacts →
	Partial evidence “HOK is a global interdisciplinary design firm.” Source: RevenueBase Database · checked Sep 22, 2026
17	Hks, INC	Partial evidence	Dallas, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	2,462 contacts →
	Partial evidence “We are a global firm of architects, designers, planners and advisors who create places noted for their beauty and performance.” Source: RevenueBase Database · checked Sep 22, 2026
18	TYPSA	Indirect evidence	San Sebastian De Los Reyes, SpainHQ checked Sep 22, 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 22, 2026
19	DLR Group	Partial evidence	30 Offices, MN, United StatesHQ checked Sep 22, 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 22, 2026
20	IMEG	Indirect evidence	Rock Island, IL, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,985 contacts →
	Indirect evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 22, 2026
21	Skidmore, Owings & Merrill SOM	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,967 contacts →
	Partial evidence “Skidmore, Owings & Merrill (SOM) is a global practice of architects, designers, engineers, and planners, responsible for some of the world’s most technically and environmentally…” Source: RevenueBase Database · checked Sep 22, 2026
22	Cannondesign	Partial evidence	New York, NY, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,660 contacts →
	Partial evidence “CannonDesign is a different kind of design firm, where architecture, strategy, experience, innovation and social good converge to create meaningful impact.” Source: RevenueBase Database · checked Sep 22, 2026
23	Swca Environmental Consultants	Indirect evidence	Phoenix, AZ, United StatesHQ checked Sep 22, 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 22, 2026
24	CRB	Partial evidence	Kansas City, MO, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,553 contacts →
	Partial 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 22, 2026
25	Ridge And Partners LLP	Indirect evidence	Woodstock, United KingdomHQ checked Sep 22, 2026	1,001-5,000	1,427 contacts →
	Indirect evidence “Ridge is a built environment consultancy, helping clients turn complex briefs into buildings and infrastructure that perform in the real world.” Source: RevenueBase Database · checked Sep 22, 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: sustainable design firms. 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 sustainable design firms.
Partial evidence: Its own public description names part of sustainable design firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable design firms. 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 42,301 sustainable design firms worldwide

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Sustainable design firms worldwide at a glance

As of Sep 22, 2026

35.4%Verified-email coverage

14.0Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

28,367

11-50

10,755

51-200

2,183

201-500

489

501-1,000

134

1,001-5,000

106

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 sustainable design firms, 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: Every country. Country and city lists for sustainable design firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “sustainable design firms”. 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 sustainable design firms), 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 sustainable design firms, 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, 210,217 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 22, 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.

Sustainable design firms by location

171 lists · largest first

Every Sustainable design firms 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 sustainable design firms, 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 sustainable design firms are there worldwide?

RevenueBase identified 42,301 sustainable design firms 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 sustainable design firms?

The United States leads with 5,355 companies, followed by India (3,050) and the United Kingdom (2,343). Every sustainable design firms list by country and city is linked on this page.

Which city has the most sustainable design firms?

London leads with 696 headquartered companies, followed by Paris (417) and Sao Paulo (397).

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 210,217 verified decision-maker contacts tracked across these 42,301 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 22, 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.