Company lists · Data refreshed September 2026

Top 25 Sustainable architecture firms based in Washington, United States

Name: Sustainable architecture 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 18, 2026 56 companies tracked

RevenueBase identified 56 sustainable architecture firms headquartered in Washington, United States as of September 2026 and tracks 1,881 professional contacts across them, including 566 with verified work emails. New York is the largest hub.

This list covers sustainable architecture 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 18, 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 18, 2026 86% judged on-target in blind review

56Companies

1,881Contacts tracked

566Verified emails

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

Ranked by team size

Top 25 of 56 sustainable architecture firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 18, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable architecture 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	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	1,001-5,000	351 contacts →
	Partial 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 18, 2026
2	Quinn Evans	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	51-200	225 contacts →
	Indirect evidence “Creators of vital places.” Source: RevenueBase Database · checked Sep 18, 2026
3	Setty & Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 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 18, 2026
4	KCCT	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 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 18, 2026
5	Shalom Baranes Associates	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	51-200	84 contacts →
	Partial 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 18, 2026
6	Baumann Consulting	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 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 18, 2026
7	David M. Schwarz Architects	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	40 contacts →
	Indirect evidence “David M.” Source: RevenueBase Database · checked Sep 18, 2026
8	CGS Architects	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 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 18, 2026
9	Hartman-Cox Architects	Indirect evidence	Washington, United StatesHQ checked Sep 18, 2026	11-50	25 contacts →
	Indirect evidence “Established in 1965, Hartman-Cox is a Washington, DC based firm that has continuously produced award-winning, imaginative and responsible design for institutional, educational and…” Source: RevenueBase Database · checked Sep 18, 2026
10	Fillat Architecture	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	20 contacts →
	Indirect evidence “FILLAT+ is a design studio headquartered in Washington, DC with offices in Baltimore, New York and San Diego.” Source: RevenueBase Database · checked Sep 18, 2026
11	Cunningham Quill Architects	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	18 contacts →
	Indirect 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 18, 2026
12	Bell Architects, PC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 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 18, 2026
13	Blackburn Architects, P.C	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	1-10	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 18, 2026
14	Soto Architecture & Urban Design, Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 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 18, 2026
15	Greenscape Energy	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	14 contacts →
	Indirect evidence “Greenscape Energy is the fastest-growing green solutions provider in the Region As a group of highly-trained professionals, the Greenscape team stands ready to meet the needs of…” Source: RevenueBase Database · checked Sep 18, 2026
16	Blue Skye Construction And Development, DC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	12 contacts →
	Indirect evidence “Founded in 2006, Blue Skye Construction, LLC is an award-winning construction and development firm located in Ward 3 in the District of Columbia.” Source: RevenueBase Database · checked Sep 18, 2026
17	Thomson & Cooke Architects	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	9 contacts →
	Partial evidence “Thomson & Cooke Architects is a custom residential architecture firm based in Washington, DC.” Source: RevenueBase Database · checked Sep 18, 2026
18	Petra Development	Strong evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	9 contacts →
	Strong evidence “With a steadfast commitment to innovation, quality, and sustainability, we specialize in crafting exceptional built environments that seamlessly blend architectural beauty with…” Source: RevenueBase Database · checked Sep 18, 2026
19	GTM DC	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 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 18, 2026
20	Istudio Architects	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	1-10	8 contacts →
	Partial evidence “ISTUDIO was founded with a dedication to creating artful, sustainable communities.” Source: RevenueBase Database · checked Sep 18, 2026
21	Maurice Walters Architect, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	1-10	6 contacts →
	Partial evidence “Our focus is in the redevelopment of existing urban environments in a thoughtful, efficient and sustainable manner.” Source: RevenueBase Database · checked Sep 18, 2026
22	Energy Shrink, LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	1-10	6 contacts →
	Partial evidence “Energy Shrink is an environmental consulting practice specialized in sustainability and energy efficiency in buildings, that is, high-performance or green buildings.” Source: RevenueBase Database · checked Sep 18, 2026
23	Saint Studio For Architecture And Interiors	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	1-10	5 contacts →
	Partial evidence “SAINT Studio for Architecture and Interiors is a multi-disciplinary architecture and design firm based in Washington, D.C, and Los Angeles, CA.” Source: RevenueBase Database · checked Sep 18, 2026
24	R2l Architects, Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	5 contacts →
	Partial evidence “R2L:Architects, PLLC was founded in 2010 to create elegant solutions to the architectural challenges faced by our clients, including communities, corporations, institutions, and…” Source: RevenueBase Database · checked Sep 18, 2026
25	Adaptive Green	Partial evidence	Washington, DC, United StatesHQ checked Sep 18, 2026	11-50	4 contacts →
	Partial evidence “Adaptive Green designs, installs and maintains green building components such as green roofs, solar panels, green walls and sustainable water management systems.” Source: RevenueBase Database · checked Sep 18, 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 architecture 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 architecture firms.
Partial evidence: Its own public description names part of sustainable architecture firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable architecture 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 56 sustainable architecture firms based in Washington, United States

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

As of Sep 18, 2026

30.1%Verified-email coverage

33.6Average contacts per company

1-10Median size (employees)

503.6%Largest-city concentration · New York

Sep 18, 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 56 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 architecture 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 architecture 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 architecture 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 architecture 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, 566 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 18, 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 architecture 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 architecture 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 architecture firms are there based in Washington, United States?

RevenueBase identified 56 sustainable architecture 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 architecture firms?

New York leads with 282 headquartered companies, followed by Los Angeles (131) and Seattle (128).

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 566 verified decision-maker contacts tracked across these 56 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 18, 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.