Company lists · Data refreshed September 2026

Top 24 Carbon neutral contractors based in Philadelphia, United States

Name: Carbon neutral contractors based in Philadelphia, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 54 companies tracked

RevenueBase identified 54 carbon neutral contractors headquartered in Philadelphia, United States as of September 2026 and tracks 1,551 professional contacts across them, including 942 with verified work emails. New York is the largest hub.

This list covers carbon neutral contractors 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 16, 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 16, 2026 86% judged on-target in blind review

54Companies

1,551Contacts tracked

942Verified emails

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The 24 largest carbon neutral contractors based in Philadelphia, United States

Ranked by team size

Top 24 of 54 carbon neutral contractors based in Philadelphia, United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to carbon neutral contractors: 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	Pennoni	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,264 contacts →
	Indirect evidence “Since our founding more than five decades ago, our clients trust Pennoni’s commitment to elevating the impact of projects on our communities.” Source: RevenueBase Database · checked Sep 16, 2026
2	IEI Group, LTD	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	11-50	33 contacts →
	Indirect 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 16, 2026
3	Innova Services Corporation	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	11-50	23 contacts →
	Indirect evidence “Innova brings more than 20 years of experience in the multi-family industry to bear in order to assist developers in all phases of development: resource efficiency…” Source: RevenueBase Database · checked Sep 16, 2026
4	RE Vision Architecture	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	11-50	19 contacts →
	Indirect 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 16, 2026
5	SMP Architects	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	11-50	15 contacts →
	Indirect evidence “Attention to environmental concerns and historic, cultural, and architectural contexts are the hallmarks of our firm.” Source: RevenueBase Database · checked Sep 16, 2026
6	Krieger Associates Architects INC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	8 contacts →
	Indirect evidence “Krieger + Associates Architects Inc is an award-winning Philadelphia firm providing architectural, planning, and interior design services to residential, institutional, and…” Source: RevenueBase Database · checked Sep 16, 2026
7	Onion Flats Architecture	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	5 contacts →
	Indirect evidence “Onion Flats Architecture focuses on community development, multidisciplinary thinking and making, high-performance building technologies and alternative construction methodologies.” Source: RevenueBase Database · checked Sep 16, 2026
8	Inch And Meter, PC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	5 contacts →
	Indirect evidence “Inch and Meter, PC is an environmental consulting and engineering firm with offices in Philadelphia and New York City.” Source: RevenueBase Database · checked Sep 16, 2026
9	Millan Architects	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	4 contacts →
	Indirect evidence “Millan Architects is an architecture firm based in Philadelphia devoted to crafting thoughtful spaces of enduring beauty, lasting value and environmental sustainability.” Source: RevenueBase Database · checked Sep 16, 2026
10	Woodcock Design	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	4 contacts →
	Indirect evidence “Based out of 1518 Walnut St Suite 1308, Philadelphia, Woodcock Design is a full service, end-to-end architecture, planning and urban design firm.” Source: RevenueBase Database · checked Sep 16, 2026
11	Boyer Sudduth Environmental Consultants, LLC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	4 contacts →
	Indirect evidence “At Boyer Sudduth Environmental Consultants, we believe schools and businesses can best achieve their sustainability goals when operations, institutional behavior, curriculum &…” Source: RevenueBase Database · checked Sep 16, 2026
12	Unitas Engineering	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	3 contacts →
	Indirect evidence “With a combination of engineering knowledge, building development experience, and business acumen, Unitas brings an unparalleled combination of skills that will serve as a…” Source: RevenueBase Database · checked Sep 16, 2026
13	Studio 111 Architecture	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	3 contacts →
	Indirect evidence “Studio Architecture is a Philadelphia based design firm, providing service throughout the region.” Source: RevenueBase Database · checked Sep 16, 2026
14	The Pelorus Group	Indirect evidence	Philadelphia, United StatesHQ checked Sep 16, 2026	1-10	2 contacts →
	Indirect evidence “Construction Consultants & Project Managers” Source: RevenueBase Database · checked Sep 16, 2026
15	Hexagon Studio Architects	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
16	Blupath Design	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	2 contacts →
	Indirect evidence “BluPath, an architecture and design firm founded in 2003 by Laura Blau, and Paul Thompson, works closely with clients to design simple, elegant and environmentally sensitive…” Source: RevenueBase Database · checked Sep 16, 2026
17	Layer Architecture	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	2 contacts →
	Indirect evidence “LAYER Architecture is a nimble, hands-on, full-service design practice.” Source: RevenueBase Database · checked Sep 16, 2026
18	E-Built INC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	11-50	1 contacts →
	Indirect evidence “E-Built is a full service Design-Build and General Contracting firm located in Philadelphia.” Source: RevenueBase Database · checked Sep 16, 2026
19	Home Science, LLC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	1 contacts →
	Indirect evidence “Home Science, LLC provides design and assessment services in the green building and home energy fields.” Source: RevenueBase Database · checked Sep 16, 2026
20	Elliott Energy	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	1 contacts →
	Indirect evidence “Elliott Energy is an energy consulting firm focusing mainly on energy audits, building modeling, benchmarking, and project management.” Source: RevenueBase Database · checked Sep 16, 2026
21	Ambit Architecture	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	1 contacts →
	Indirect evidence “Architecture and Interior Design” Source: RevenueBase Database · checked Sep 16, 2026
22	Ease Sustainability Group	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	1 contacts →
	Indirect evidence “We are a collective of energy engineers and consultants who want to accelerate the energy transition and solve the biggest sustainability challenges facing us today.” Source: RevenueBase Database · checked Sep 16, 2026
23	24 7 Design Group, LLC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	1 contacts →
	Indirect evidence “24/7 Design Group is a Philadelphia-based firm that provides architectural services and solutions to all our clients’ needs.” Source: RevenueBase Database · checked Sep 16, 2026
24	Holzraum System LLC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 16, 2026	1-10	1 contacts →
	Indirect evidence “We are passionate about reducing the embodied and operational footprint of your buildings and the Passive House benefits of health, comfort, craftsmanship, and net-zero…” Source: RevenueBase Database · checked Sep 16, 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: carbon neutral contractors. 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 carbon neutral contractors.
Partial evidence: Its own public description names part of carbon neutral contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name carbon neutral contractors. 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 24 of 54 carbon neutral contractors based in Philadelphia, United States

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Carbon neutral contractors based in Philadelphia, United States at a glance

As of Sep 16, 2026

60.7%Verified-email coverage

28.7Average contacts per company

1-10Median size (employees)

488.9%Largest-city concentration · New York

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

1,001-5,000

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 54 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 carbon neutral contractors, 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 “carbon neutral contractors”. 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 carbon neutral contractors), 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 carbon neutral contractors, 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, 942 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 16, 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.

Carbon neutral contractors 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 carbon neutral contractors, 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 carbon neutral contractors are there based in Philadelphia, United States?

RevenueBase identified 54 carbon neutral contractors 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?

Pennoni, headquartered in Philadelphia, tops this list with the largest team on record.

Which city has the most carbon neutral contractors?

New York leads with 264 headquartered companies, followed by Houston (106) and Los Angeles (106).

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 942 verified decision-maker contacts tracked across these 54 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 16, 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.