Company lists · Data refreshed September 2026

Top 25 Sustainable design firms based in Washington, United States

Name: Sustainable design firms based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 73 companies tracked

RevenueBase identified 73 sustainable design firms headquartered in Washington, United States as of September 2026 and tracks 2,073 professional contacts across them, including 663 with verified work emails. New York is the largest hub.

This list covers sustainable design firms headquartered in Washington, 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 22, 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 22, 2026 86% judged on-target in blind review

73Companies

2,073Contacts tracked

663Verified emails

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The 25 largest sustainable design firms based in Washington, United States

Ranked by team size

Top 25 of 73 sustainable design firms based in Washington, United States, 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	RTKL	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1,001-5,000	351 contacts →
	Strong evidence “CRTKL has now joined Arcadis, a global leader in the delivery of sustainable design, engineering and consultancy solutions for natural and built assets.” Source: RevenueBase Database · checked Sep 22, 2026
2	Quinn Evans	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	225 contacts →
	Indirect evidence “Creators of vital places.” Source: RevenueBase Database · checked Sep 22, 2026
3	Setty & Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	201-500	220 contacts →
	Indirect evidence “Established in 1984, SETTY is headquartered in Fairfax, VA, with offices in Atlanta, GA, Baltimore, MD, Charlottesville, VA, Fairfax, VA, Los Angeles, CA, New York, NY…” Source: RevenueBase Database · checked Sep 22, 2026
4	KCCT	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	87 contacts →
	Partial evidence “For 40 years, KCCT has created innovative and monumental architecture and interior design projects in more than 140 countries.” Source: RevenueBase Database · checked Sep 22, 2026
5	Shalom Baranes Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	84 contacts →
	Indirect evidence “Shalom Baranes Associates (SBA) is a Washington, DC architectural firm with an acclaimed reputation for its expertise in residential, commercial, institutional, and governmental…” Source: RevenueBase Database · checked Sep 22, 2026
6	Peer Consultants, P.C	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	71 contacts →
	Indirect evidence “In 1978, PEER was established under Dr.” Source: RevenueBase Database · checked Sep 22, 2026
7	Baumann Consulting	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	63 contacts →
	Indirect evidence “Baumann Consulting is driven to deliver solutions for a carbon-neutral real estate industry.” Source: RevenueBase Database · checked Sep 22, 2026
8	David M. Schwarz Architects	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	40 contacts →
	Indirect evidence “David M.” Source: RevenueBase Database · checked Sep 22, 2026
9	CGS Architects	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	30 contacts →
	Partial evidence “CGS Architects was founded in Georgetown in 1981 to provide services in master planning, architecture and interior design.” Source: RevenueBase Database · checked Sep 22, 2026
10	MAP	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1-10	28 contacts →
	Partial evidence “MAP's work is distinguished by designs rooted in the Climate of a place.” Source: RevenueBase Database · checked Sep 22, 2026
11	Moya Design Partners Moya	Strong evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	26 contacts →
	Strong evidence “Moya Design Partners (MOYA) is a multidisciplinary design studio known for its inclusivity, sustainability, and cultural sensitivity.” Source: RevenueBase Database · checked Sep 22, 2026
12	Northbridge	Indirect evidence	Washington, United StatesHQ checked Sep 22, 2026	11-50	24 contacts →
	Indirect evidence “At Northbridge, we provide our clients with the tools and expertise to help solve complex financial, policy, and environmental challenges.” Source: RevenueBase Database · checked Sep 22, 2026
13	North Arrow, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	22 contacts →
	Indirect evidence “DUNS Number: 08-001-8268 CAGE Code: 7GN69 SBA Certified Small Business District of Columbia Certified Business Enterprise (CBE) Metropolitan Washington Airports Authority Local…” Source: RevenueBase Database · checked Sep 22, 2026
14	Fillat Architecture	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	20 contacts →
	Partial evidence “FILLAT+ is a design studio headquartered in Washington, DC with offices in Baltimore, New York and San Diego.” Source: RevenueBase Database · checked Sep 22, 2026
15	Cunningham Quill Architects	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	18 contacts →
	Partial evidence “Established in 1996, Cunningham \| Quill Architects has generated a diverse portfolio of projects that celebrate context and reflect a fresh and insightful approach to design.” Source: RevenueBase Database · checked Sep 22, 2026
16	Bell Architects, PC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	16 contacts →
	Indirect evidence “BELL Architects' works closely with communities to create places where people want to be.” Source: RevenueBase Database · checked Sep 22, 2026
17	Bradley Site Design, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	16 contacts →
	Partial evidence “Located in Washington, DC, Bradley Site Design is a dynamic Landscape Architecture, Civil Engineering and Planning firm founded in 1994 and dedicated to the creation of socially…” Source: RevenueBase Database · checked Sep 22, 2026
18	Co2efficient	Indirect evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1-10	14 contacts →
	Indirect evidence “CO2EFFICIENT LLC (COEFFICIENT) was founded in 2017 as a mission-focused Washington, D.C.” Source: RevenueBase Database · checked Sep 22, 2026
19	Sustainable YOU	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	51-200	14 contacts →
	Partial evidence “Sustainable You is a national strategic consulting firm in solar and sustainability serving residential and small commercial clients with a focus in the DC, Maryland and Virginia…” Source: RevenueBase Database · checked Sep 22, 2026
20	Soto Architecture & Urban Design, Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	14 contacts →
	Partial evidence “Architecture & Urban design team located in the 14th Street corridor of Washington, DC.” Source: RevenueBase Database · checked Sep 22, 2026
21	LEE And Associates, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	11-50	12 contacts →
	Partial evidence “lee and associates, inc (lai) is a respected and highly responsive firm offering planning and design professional services as it relates to how man relates to the land and the…” Source: RevenueBase Database · checked Sep 22, 2026
22	Nahra Design Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1-10	9 contacts →
	Partial evidence “Nahra Design Group is an award-winning, full-service Architecture and Interior design firm.” Source: RevenueBase Database · checked Sep 22, 2026
23	GTM DC	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1-10	8 contacts →
	Partial evidence “GTM Architects of Washington DC, LLC (GTM\|DC) is a full service, award-winning firm offering services in architecture, planning and design.” Source: RevenueBase Database · checked Sep 22, 2026
24	Paradigmoffice	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1-10	8 contacts →
	Partial evidence “At PARADIGMoffice we are architects, designers, and researchers who passionately believe that everyone should have thoughtfully designed environments that nourish and sustain…” Source: RevenueBase Database · checked Sep 22, 2026
25	Istudio Architects	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	1-10	8 contacts →
	Partial evidence “ISTUDIO was founded with a dedication to creating artful, sustainable communities.” 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 73 sustainable design firms based in Washington, United States

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Sustainable design firms based in Washington, United States at a glance

As of Sep 22, 2026

32.0%Verified-email coverage

28.4Average contacts per company

1-10Median size (employees)

441.1%Largest-city concentration · New York

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 73 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 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.
What qualifies: Companies headquartered in Washington, United States 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. Companies headquartered outside Washington 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, 663 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 metro in the United States

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 based in Washington, United States?

RevenueBase identified 73 sustainable design firms headquartered in Washington, 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?

RTKL, headquartered in Washington, tops this list with the largest team on record.

Which city has the most sustainable design firms?

New York leads with 322 headquartered companies, followed by Los Angeles (146) and Seattle (121).

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 663 verified decision-maker contacts tracked across these 73 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.