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 company matches for sustainable architecture firms associated with Washington, United States as of September 2026 and tracks 1,881 professional contacts across them, including 566 with verified work emails. Across the United States, New York is the largest hub for this category (282 companies); Washington has 56.

This list covers company matches for sustainable architecture firms associated with Washington, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 18, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 18, 2026 How this list was built

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 company matches for sustainable architecture firms based in Washington, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 18, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	RTKL	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	1,001-5,000	351 contacts →
	Exact match “CRTKL has now joined Arcadis, a global leader in the delivery of sustainable design, engineering and consultancy solutions for natural and built assets.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
2	Quinn Evans	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	51-200	225 contacts →
	Exact match “Creators of vital places.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
3	Setty & Associates	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	201-500	220 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
4	KCCT	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	51-200	87 contacts →
	Exact match “For 40 years, KCCT has created innovative and monumental architecture and interior design projects in more than 140 countries.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
5	Shalom Baranes Associates	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	51-200	84 contacts →
	Exact match “Shalom Baranes Associates (SBA) is a Washington, DC architectural firm with an acclaimed reputation for its expertise in residential, commercial, institutional, and governmental…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
6	Baumann Consulting	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	51-200	63 contacts →
	Exact match “Baumann Consulting is driven to deliver solutions for a carbon-neutral real estate industry.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
7	David M. Schwarz Architects	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	40 contacts →
	Exact match “David M.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
8	CGS Architects	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	30 contacts →
	Exact match “CGS Architects was founded in Georgetown in 1981 to provide services in master planning, architecture and interior design.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
9	Hartman-Cox Architects	Exact match	Washington, United StatesHQ recorded Sep 18, 2026	11-50	25 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
10	Fillat Architecture	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	20 contacts →
	Exact match “FILLAT+ is a design studio headquartered in Washington, DC with offices in Baltimore, New York and San Diego.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
11	Cunningham Quill Architects	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	18 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
12	Bell Architects, PC	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	16 contacts →
	Exact match “BELL Architects' works closely with communities to create places where people want to be.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
13	Blackburn Architects, P.C	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	1-10	15 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
14	Soto Architecture & Urban Design, Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	14 contacts →
	Exact match “Architecture & Urban design team located in the 14th Street corridor of Washington, DC.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
15	Greenscape Energy	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	14 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
16	Blue Skye Construction And Development, DC	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	12 contacts →
	Exact match “Founded in 2006, Blue Skye Construction, LLC is an award-winning construction and development firm located in Ward 3 in the District of Columbia.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
17	Thomson & Cooke Architects	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	9 contacts →
	Exact match “Thomson & Cooke Architects is a custom residential architecture firm based in Washington, DC.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
18	Petra Development	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	9 contacts →
	Exact match “With a steadfast commitment to innovation, quality, and sustainability, we specialize in crafting exceptional built environments that seamlessly blend architectural beauty with…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
19	GTM DC	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	1-10	8 contacts →
	Exact match “GTM Architects of Washington DC, LLC (GTM\|DC) is a full service, award-winning firm offering services in architecture, planning and design.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
20	Istudio Architects	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	1-10	8 contacts →
	Exact match “ISTUDIO was founded with a dedication to creating artful, sustainable communities.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
21	Maurice Walters Architect, INC	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	1-10	6 contacts →
	Exact match “Our focus is in the redevelopment of existing urban environments in a thoughtful, efficient and sustainable manner.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
22	Energy Shrink, LLC	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	1-10	6 contacts →
	Exact match “Energy Shrink is an environmental consulting practice specialized in sustainability and energy efficiency in buildings, that is, high-performance or green buildings.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
23	Saint Studio For Architecture And Interiors	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	1-10	5 contacts →
	Exact match “SAINT Studio for Architecture and Interiors is a multi-disciplinary architecture and design firm based in Washington, D.C, and Los Angeles, CA.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
24	R2l Architects, Pllc	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	5 contacts →
	Exact match “R2L:Architects, PLLC was founded in 2010 to create elegant solutions to the architectural challenges faced by our clients, including communities, corporations, institutions, and…” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase
25	Adaptive Green	Exact match	Washington, DC, United StatesHQ recorded Sep 18, 2026	11-50	4 contacts →
	Exact match “Adaptive Green designs, installs and maintains green building components such as green roofs, solar panels, green walls and sustainable water management systems.” Recorded in the RevenueBase company graph · Sep 18, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “sustainable architecture firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 56 sustainable architecture firms based in Washington, United States

See the full list, filter by size, metro and specialty, and access 566 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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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)

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Washington, United States whose business descriptions match “sustainable architecture firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 566 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Sustainable architecture firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “sustainable architecture firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainable architecture firms are there based in Washington, United States?

RevenueBase identified 56 company matches for sustainable architecture firms associated with Washington, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

RTKL tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most sustainable architecture firms?

New York leads the United States with 282 company records, followed by Los Angeles (131) and Seattle (128). Washington has 56.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 566 professional contacts with verified work emails tracked across these 56 companies; direct dials are available where recorded.

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 SmartSearch, 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.