Company lists · Data refreshed September 2026

Top 25 Environmental design firms based in Houston, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 169 companies tracked

RevenueBase identified 169 environmental design firms headquartered in Houston, United States as of September 2026 and tracks 3,317 professional contacts across them, including 1,526 with verified work emails. New York is the largest hub.

This list covers environmental design firms headquartered in Houston, 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

169Companies

3,317Contacts tracked

1,526Verified emails

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The 25 largest environmental design firms based in Houston, United States

Ranked by team size

Top 25 of 169 environmental design firms based in Houston, 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	Estudio Architecture	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	n/a	390 contacts →
	Partial evidence “eStudio is a specialized full service architectural and boutique design firm.” Source: RevenueBase Database · checked Sep 19, 2026
2	PGAL	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	312 contacts →
	Partial evidence “Founded in 1946, PGAL is a design firm specializing in architecture, engineering, interiors, and planning for a diverse portfolio of public and private sector clients.” Source: RevenueBase Database · checked Sep 19, 2026
3	GSI Environmental INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	259 contacts →
	Partial evidence “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: RevenueBase Database · checked Sep 19, 2026
4	Kirksey Architecture	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	252 contacts →
	Indirect evidence “We are Kirksey, a Texas-based architecture firm, passionate about great architecture and all things sustainable.” Source: RevenueBase Database · checked Sep 19, 2026
5	Shah Smith & Associates, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	134 contacts →
	Indirect evidence “Shah Smith & Associates, Inc.(SSA) is a 120+ employee Mechanical, Electrical, and Plumbing (MEP) consulting engineering firm with offices in Houston, Austin & Dallas.” Source: RevenueBase Database · checked Sep 19, 2026
6	Powers Brown Architecture	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	124 contacts →
	Partial evidence “Powers Brown Architecture is a professional services firm practicing architecture, interior design, programming and urban design.” Source: RevenueBase Database · checked Sep 19, 2026
7	OJB Landscape Architecture	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	124 contacts →
	Indirect evidence “OJB Landscape Architecture focuses on creating landscapes that transform perspectives and evoke emotional responses, creating unique and unforgettable sensory experiences.” Source: RevenueBase Database · checked Sep 19, 2026
8	GOREE	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	102 contacts →
	Strong evidence “Goree is a full-service architecture and design firm delivering solution-focused, performance-driven environments in a multitude of markets.” Source: RevenueBase Database · checked Sep 19, 2026
9	Rottet Studio	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	87 contacts →
	Partial evidence “Rottet Studio is widely regarded as one of the finest design practices in the world and was voted one of the Top 3 Most Admired Firms by a jury of peer professionals.” Source: RevenueBase Database · checked Sep 19, 2026
10	PDR	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	78 contacts →
	Partial evidence “Through our design, architecture and consulting services, we have an unparalleled track record of solving for human experiences, and design challenges around the world.” Source: RevenueBase Database · checked Sep 19, 2026
11	Abel Design Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	67 contacts →
	Partial evidence “Founded in Houston, Texas in 2001, Abel Design Group (ADG) is an award-winning architecture and interior design firm specializing in corporate, hospitality, higher education…” Source: RevenueBase Database · checked Sep 19, 2026
12	KW Landscape Architects	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	59 contacts →
	Indirect evidence “KW Landscape Architects (KW) is a professional landscape architecture firm with offices in Austin, Houston, Indianapolis, and San Antonio.” Source: RevenueBase Database · checked Sep 19, 2026
13	FKP Cannondesign	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	52 contacts →
	Partial evidence “Founded in 1937, FKP \| CannonDesign is one of the nation's largest specialty practices, focused on the planning and design of modern healthcare, higher education and research…” Source: RevenueBase Database · checked Sep 19, 2026
14	Harrisonkornberg Architects	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	49 contacts →
	Indirect evidence “Founded in 2003, HarrisonKornberg Architects provides a full range of high-quality architectural services to the Texas market and beyond.” Source: RevenueBase Database · checked Sep 19, 2026
15	PDG Architects	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	46 contacts →
	Indirect evidence “PDG Architects, based in Houston, Texas, is a full-service architectural firm recognized for quality performance.” Source: RevenueBase Database · checked Sep 19, 2026
16	Energy Architecture, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	44 contacts →
	Indirect evidence “Energy Architecture is a specialized architecture firm based in Houston, serving clients at the forefront of innovation, research, and discovery.” Source: RevenueBase Database · checked Sep 19, 2026
17	Morris Architects A Huitt-Zollars Company	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	44 contacts →
	Partial evidence “With over 75 years of design expertise, Morris, a Huitt-Zollars Company, is an award-winning, full-service practice with locations in Houston, Orlando, Los Angeles, Fort Worth…” Source: RevenueBase Database · checked Sep 19, 2026
18	EDI International, PC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	41 contacts →
	Partial evidence “Established in 1976, EDI is a global architecture, interior design and planning firm specializing in commercial, leisure, hospitality, residential and planning projects.” Source: RevenueBase Database · checked Sep 19, 2026
19	Asakura Robinson	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	36 contacts →
	Partial evidence “Asakura Robinson Company LLC is recognized as an outstanding Landscape Architecture firm most noted for design sensitivity, highly effective public engagement and as tireless…” Source: RevenueBase Database · checked Sep 19, 2026
20	Clark Condon	Strong evidence	Houston, United StatesHQ checked Sep 19, 2026	11-50	34 contacts →
	Strong evidence “Clark Condon is a Houston-based Landscape Architecture firm specializing in the design of creative, interactive and meaningful outdoor environments for our clients and the…” Source: RevenueBase Database · checked Sep 19, 2026
21	Identity Architects	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	34 contacts →
	Partial evidence “Founded in Houston, Identity Architecture is a commercial architecture firm specializing in master planning, architecture, interior design, and design-build options.” Source: RevenueBase Database · checked Sep 19, 2026
22	UES Professional Solutions 64, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	31 contacts →
	Partial evidence “Environmental Consulting and Engineering InControl Technologies was established in 1997 to provide high-end quality environmental consulting services to owners of commercial and…” Source: RevenueBase Database · checked Sep 19, 2026
23	B&d Contractors	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	29 contacts →
	Indirect evidence “At B&D, it’s our job to Think Outside.” Source: RevenueBase Database · checked Sep 19, 2026
24	English Associates Architects, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	28 contacts →
	Partial evidence “English + Associates Architects is a full-service architectural and interior design firm specializing in high-performance, green-design solutions.” Source: RevenueBase Database · checked Sep 19, 2026
25	By Design Interiors, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	27 contacts →
	Partial evidence “By Design Interiors is an award-winning design firm, founded in 1990.” 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 169 environmental design firms based in Houston, United States

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Environmental design firms based in Houston, United States at a glance

As of Sep 19, 2026

46.0%Verified-email coverage

19.6Average contacts per company

1-10Median size (employees)

327.2%Largest-city concentration · New York

Sep 19, 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 Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 169 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 Houston, 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 Houston 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, 1,526 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 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 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 Houston, United States?

RevenueBase identified 169 environmental design firms headquartered in Houston, 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?

Estudio Architecture, headquartered in Houston, 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 1,526 verified decision-maker contacts tracked across these 169 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.

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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.