Company lists · Data refreshed September 2026

Top 25 Environmental design firms based in Philadelphia, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 102 companies tracked

RevenueBase identified 102 environmental design firms headquartered in Philadelphia, United States as of September 2026 and tracks 2,141 professional contacts across them, including 1,101 with verified work emails. New York is the largest hub.

This list covers environmental design firms headquartered in Philadelphia, 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

102Companies

2,141Contacts tracked

1,101Verified emails

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

Ranked by team size

Top 25 of 102 environmental design firms based in Philadelphia, 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	Ewingcole	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	201-500	509 contacts →
	Partial evidence “EwingCole is a nationally recognized architecture, engineering, interior design, and planning firm with offices in Atlanta, Baltimore, Charlotte, Fort Worth, Irvine, New York…” Source: RevenueBase Database · checked Sep 19, 2026
2	Ballinger	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	201-500	316 contacts →
	Partial evidence “Ballinger's Philadelphia-based, integrated team of architects, engineers, planners, and interior designers works with visionary institutions to create places that empower those…” Source: RevenueBase Database · checked Sep 19, 2026
3	FCA	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	51-200	249 contacts →
	Partial evidence “FCA is a full-service architectural and design firm.” Source: RevenueBase Database · checked Sep 19, 2026
4	WRT	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	51-200	180 contacts →
	Partial evidence “WRT is a team of planners, urban designers, architects, and landscape architects.” Source: RevenueBase Database · checked Sep 19, 2026
5	OLIN	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	51-200	162 contacts →
	Partial evidence “OLIN is dedicated to affecting positive change through landscape architecture, urban design and planning.” Source: RevenueBase Database · checked Sep 19, 2026
6	Jacobswyper Architects	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	51-200	63 contacts →
	Partial evidence “JacobsWyper Architects is a certified WBE architectural, planning and interior design firm with locations in Philadelphia, PA, Raleigh, N.C, and Austin, TX.” Source: RevenueBase Database · checked Sep 19, 2026
7	Digsau	Strong evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	41 contacts →
	Strong evidence “DIGSAU practices contemporary architecture, urbanism and environmental design.” Source: RevenueBase Database · checked Sep 19, 2026
8	IEI Group, LTD	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	33 contacts →
	Partial evidence “IEI is a nationally recognized, award-winning, 20-person architecture, interior design and facilities planning firm based in Northern Liberties for last 20 years.” Source: RevenueBase Database · checked Sep 19, 2026
9	Cosciamoos Architecture	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	32 contacts →
	Partial evidence “CosciaMoos Architecture, founded by principals Sergio Coscia and David Moos, provides architectural design and planning across a broad range of project types, serving clients…” Source: RevenueBase Database · checked Sep 19, 2026
10	CLR Design	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	26 contacts →
	Indirect evidence “We are a team of passionate professionals who bring varied experience and steadfast dedication to every project.” Source: RevenueBase Database · checked Sep 19, 2026
11	CBP Architects	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	24 contacts →
	Partial evidence “CBP Architects is an architecture firm providing design services to governmental, educational, institutional and private sector clients.” Source: RevenueBase Database · checked Sep 19, 2026
12	Wulff Architects	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	23 contacts →
	Partial evidence “Named after its founder and President, Al Wulff, Wulff Architects was envisioned in 1992 as a community of architects and designers working together to advance both commercial…” Source: RevenueBase Database · checked Sep 19, 2026
13	Ground Reconsidered	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “Ground Reconsidered is a landscape architecture studio dedicated to realizing engaging, beautiful and memorable places.” Source: RevenueBase Database · checked Sep 19, 2026
14	RE Vision Architecture	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	19 contacts →
	Partial evidence “Re:Vision is a deep green architecture and sustainability consulting practice dedicated to the design of high-performance buildings and sustainable communities.” Source: RevenueBase Database · checked Sep 19, 2026
15	Daroff Design	Partial evidence	Philadelphia, United StatesHQ checked Sep 19, 2026	11-50	18 contacts →
	Partial evidence “Daroff Design Inc + DDI Architects, PC (DDI), is an award winning, internationally acclaimed interiors, architecture, branding, and graphic design firm.” Source: RevenueBase Database · checked Sep 19, 2026
16	David Rubin Land Collective	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	16 contacts →
	Partial evidence “DAVID RUBIN Land Collective is driven by design empathy and emphasizes holistically-sustainable principles, with social sustainability leading the design effort.” Source: RevenueBase Database · checked Sep 19, 2026
17	SMP Architects	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	15 contacts →
	Partial evidence “Attention to environmental concerns and historic, cultural, and architectural contexts are the hallmarks of our firm.” Source: RevenueBase Database · checked Sep 19, 2026
18	Floss Barber INC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
19	Tantillo Architecture LLC	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	1-10	14 contacts →
	Partial evidence “Tantillo Architecture is a high energy generalist architectural design firm focused on bringing innovative design strategies to commercial and residential clients.” Source: RevenueBase Database · checked Sep 19, 2026
20	Plant Group	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	1-10	14 contacts →
	Partial evidence “PLANT Group (People Learning About Nature Together) is an ecological design and engineering firm connecting humans and nature to enable climate adaptation and mitigation work.” Source: RevenueBase Database · checked Sep 19, 2026
21	Andropogon Associates, LTD	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	13 contacts →
	Partial evidence “Founded more than forty years ago, Andropogon is committed to the principle of “designing with nature,” creating beautiful and evocative landscapes inspired by the careful…” Source: RevenueBase Database · checked Sep 19, 2026
22	O Z Collaborative	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	11-50	12 contacts →
	Indirect evidence “Rooted in West Philadelphia, O Z Collaborative creates architecture grounded in the complex realities of our clients, their stakeholders, and the communities they serve.” Source: RevenueBase Database · checked Sep 19, 2026
23	Studio Sustena	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	1-10	9 contacts →
	Partial evidence “Studio Sustena (formerly called Roofmeadow and Roofscapes, Inc.) provides "integrated site design," which blends landscape architecture with civil engineering to create…” Source: RevenueBase Database · checked Sep 19, 2026
24	Studio IQL	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	1-10	8 contacts →
	Partial evidence “Studio IQL is the result of 20 years of collaborative design work.” Source: RevenueBase Database · checked Sep 19, 2026
25	Toner Architects	Partial evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	1-10	8 contacts →
	Partial evidence “Toner architects was founded with one singular goal in mind; collaborate with clients who enjoy the process of design, architecture, and building.” 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 102 environmental design firms based in Philadelphia, United States

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

As of Sep 19, 2026

51.4%Verified-email coverage

21.0Average contacts per company

1-10Median size (employees)

542.2%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for Philadelphia, so it is reported there. Company counts and contact totals on this page are exact for Philadelphia, over 102 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 Philadelphia, 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 Philadelphia 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, 1,101 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 Philadelphia, United States?

RevenueBase identified 102 environmental design firms headquartered in Philadelphia, 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?

Ewingcole, headquartered in Philadelphia, 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 1,101 verified decision-maker contacts tracked across these 102 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.