Company lists · Data refreshed September 2026

Top 25 Environmental design firms based in the United States

Name: Environmental design firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 12,004 companies tracked

RevenueBase identified 12,004 environmental design firms headquartered in the United States as of September 2026 and tracks 220,306 professional contacts across them, including 105,766 with verified work emails. New York is the largest hub.

This list covers environmental design firms 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 19, 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 19, 2026 86% judged on-target in blind review

12,004Companies

220,306Contacts tracked

105,766Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest environmental design firms based in the United States

Ranked by team size

Top 25 of 12,004 environmental design firms based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental 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	WSP In The U.S	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	10001+	9,318 contacts →
	Partial evidence “What if you could shape built and natural environments – and the future of those that use them?” Source: RevenueBase Database · checked Sep 19, 2026
2	Perkins&will	Partial evidence	Chicago, IL, United StatesHQ checked Sep 19, 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 19, 2026
3	HOK	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,614 contacts →
	Partial evidence “HOK is a global interdisciplinary design firm.” Source: RevenueBase Database · checked Sep 19, 2026
4	Hks, INC	Partial evidence	Dallas, TX, United StatesHQ checked Sep 19, 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 19, 2026
5	DLR Group	Partial evidence	30 Offices, MN, United StatesHQ checked Sep 19, 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 19, 2026
6	IMEG	Indirect evidence	Rock Island, IL, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,985 contacts →
	Indirect evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 19, 2026
7	Skidmore, Owings & Merrill SOM	Strong evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,967 contacts →
	Strong 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 19, 2026
8	Smithgroup	Partial evidence	Detroit, MI, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,849 contacts →
	Partial evidence “SmithGroup is an award-winning, multi-national integrated design firm that employs research, data, advanced technologies and design thinking to help clients solve their greatest…” Source: RevenueBase Database · checked Sep 19, 2026
9	Swca Environmental Consultants	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,629 contacts →
	Partial 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 19, 2026
10	IA Interior Architects	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	501-1,000	1,584 contacts →
	Partial evidence “Celebrating 40 years of visionary design and innovation, IA Interior Architects is the first global architecture firm focused exclusively on interiors.” Source: RevenueBase Database · checked Sep 19, 2026
11	HGA	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,543 contacts →
	Partial evidence “HGA is a national interdisciplinary design firm committed to making a positive, lasting impact for our clients and communities through research-based, holistic solutions.” Source: RevenueBase Database · checked Sep 19, 2026
12	Corgan	Partial evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,414 contacts →
	Partial evidence “Corgan is an employee-owned architecture and design firm with 22 locations and more than 1,300 team members globally.” Source: RevenueBase Database · checked Sep 19, 2026
13	PAGE	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,191 contacts →
	Partial evidence “Performance by Design.” Source: RevenueBase Database · checked Sep 19, 2026
14	OLA	Partial evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	n/a	1,145 contacts →
	Partial 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 19, 2026
15	Perkins Eastman	Strong evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,083 contacts →
	Strong evidence “Perkins Eastman is a global design practice founded on the belief that design has the power to enhance people’s lives and safeguard the environment.” Source: RevenueBase Database · checked Sep 19, 2026
16	Braun Intertec Corporation	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,065 contacts →
	Partial evidence “At Braun Intertec, we work at the intersection of the natural and built environments, combining science, technology, and engineering.” Source: RevenueBase Database · checked Sep 19, 2026
17	Ware Malcomb	Partial evidence	International Design Firm, United StatesHQ checked Sep 19, 2026	501-1,000	992 contacts →
	Partial evidence “Established in 1972, Ware Malcomb is a dynamic, forward-thinking design firm offering streamlined architecture, interior design, branding, and engineering services across the…” Source: RevenueBase Database · checked Sep 19, 2026
18	IEA	Partial evidence	Brooklyn Park, MN, United StatesHQ checked Sep 19, 2026	n/a	982 contacts →
	Partial evidence “The Institute for Environmental Assessment, Inc.(IEA) is small business committed to providing trusted environmental safety consulting services for private and public…” Source: RevenueBase Database · checked Sep 19, 2026
19	KPF	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	970 contacts →
	Partial evidence “KPF is dedicated to transforming cities through impactful design, collaborating closely with the world’s most forward-thinking clients to create high performing, carefully crafted…” Source: RevenueBase Database · checked Sep 19, 2026
20	Parametrix	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	501-1,000	880 contacts →
	Indirect evidence “At Parametrix, we help our clients imagine what's possible.” Source: RevenueBase Database · checked Sep 19, 2026
21	ATC Group Services LLC	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 19, 2026	1,001-5,000	865 contacts →
	Indirect evidence “ATC Group Services LLC is now Atlas.” Source: RevenueBase Database · checked Sep 19, 2026
22	ZGF Architects	Indirect evidence	Portland, OR, United StatesHQ checked Sep 19, 2026	501-1,000	829 contacts →
	Indirect evidence “With our origins in Oregon, attention to craft and beauty is elemental to the ZGF culture.” Source: RevenueBase Database · checked Sep 19, 2026
23	Nbbj Design	Strong evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	501-1,000	808 contacts →
	Strong evidence “NBBJ is an ideas-driven architecture and design firm dedicated to creating connected communities, healthier buildings and a more resilient environment.” Source: RevenueBase Database · checked Sep 19, 2026
24	DUDEK	Partial evidence	Encinitas, CA, United StatesHQ checked Sep 19, 2026	501-1,000	795 contacts →
	Partial evidence “Dudek is an environmental, planning, and engineering consulting firm.” Source: RevenueBase Database · checked Sep 19, 2026
25	GPD Group	Indirect evidence	Akron, OH, United StatesHQ checked Sep 19, 2026	501-1,000	786 contacts →
	Indirect evidence “Founded in 1961, GPD Group (GPD) has grown from only a handful of people to over 870 professionals in 14 offices located in Akron, Atlanta, Cleveland, Columbus, Dallas…” Source: RevenueBase Database · checked Sep 19, 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: environmental 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 environmental design firms.
Partial evidence: Its own public description names part of environmental design firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental 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 12,004 environmental design firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 105,766 reachable decision-makers.

Free signup · no credit card

View the full list →

Environmental design firms based in the United States at a glance

As of Sep 19, 2026

48.0%Verified-email coverage

18.4Average contacts per company

1-10Median size (employees)

4.6%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

7,293

11-50

3,635

51-200

837

201-500

131

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 12,004 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 environmental 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “environmental 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 environmental 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 environmental design firms, 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, 105,766 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 19, 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.

Environmental design firms 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 environmental 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 environmental design firms are there based in the United States?

RevenueBase identified 12,004 environmental design firms 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 environmental design firms?

New York leads with 553 headquartered companies, followed by Los Angeles (272) and Chicago (205).

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 105,766 verified decision-maker contacts tracked across these 12,004 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 19, 2026.

Ready to reach these companies? Verified emails and direct dials for all 12,004 environmental design firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Environmental design firms by geography

Browse the directory

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.