Company lists · Data refreshed October 2026

Top 25 Green building and energy efficiency contractors based in the United States

Name: Green building and energy efficiency contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 13, 2026 2,656 companies tracked

RevenueBase identified 2,656 company matches for green building and energy efficiency contractors associated with the United States as of October 2026 and tracks 39,281 professional contacts across them, including 17,386 with verified work emails. New York is the largest hub.

This list covers company matches for green building and energy efficiency contractors associated with the 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 October 13, 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 Oct 13, 2026 How this list was built

2,656Companies

39,281Contacts tracked

17,386Verified emails

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The 25 largest green building and energy efficiency contractors based in the United States

Ranked by team size

Top 25 of 2,656 company matches for green building and energy efficiency contractors based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 13, 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	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Oct 13, 2026	1,001-5,000	2,293 contacts →
	Exact match “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
2	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Oct 13, 2026	1,001-5,000	2,206 contacts →
	Exact match “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
3	DLR Group	Exact match	30 Offices, MN, United StatesHQ recorded Oct 13, 2026	1,001-5,000	2,039 contacts →
	Exact match “DLR Group is an integrated design firm delivering architecture, engineering, interiors, planning, and building optimization for new construction, renovation, and adaptive reuse.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
4	OLA	Exact match	Austin, TX, United StatesHQ recorded Oct 13, 2026	n/a	1,150 contacts →
	Exact match “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
5	Syska Hennessy Group	Exact match	New York, United StatesHQ recorded Oct 13, 2026	501-1,000	835 contacts →
	Exact match “Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
6	PAE	Exact match	Portland, OR, United StatesHQ recorded Oct 13, 2026	201-500	835 contacts →
	Exact match “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
7	Introba	Exact match	St. Louis, MO, United StatesHQ recorded Oct 13, 2026	1,001-5,000	816 contacts →
	Exact match “Introba is one of the world’s largest building engineering and consulting firms with more than employees in offices across the United States, Canada, the United Kingdom, Serbia…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
8	Vanderweil Engineers	Exact match	Boston, MA, United StatesHQ recorded Oct 13, 2026	201-500	562 contacts →
	Exact match “Vanderweil is a mechanical, electrical, plumbing, fire protection, technology, sustainability, commissioning, and power engineering firm dedicated to providing customized and…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
9	U.S. Green Building Council	Exact match	Washington, DC, United StatesHQ recorded Oct 13, 2026	201-500	545 contacts →
	Exact match “The U.S.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
10	Sitelogiq	Exact match	Minneapolis, MN, United StatesHQ recorded Oct 13, 2026	501-1,000	491 contacts →
	Exact match “SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
11	Noresco	Exact match	Westborough, MA, United StatesHQ recorded Oct 13, 2026	201-500	479 contacts →
	Exact match “NORESCO, an OPTERRA company, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
12	Arcxis	Exact match	Houston, TX, United StatesHQ recorded Oct 13, 2026	501-1,000	392 contacts →
	Exact match “ARCXIS (Formerly DPIS Builder Services), is the largest provider of HERS inspections, ENERGY STAR ratings, engineering and design, construction quality assurance and other builder…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
13	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Oct 13, 2026	201-500	381 contacts →
	Exact match “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
14	Homeworks Energy, INC	Exact match	Medford, MA, United StatesHQ recorded Oct 13, 2026	201-500	369 contacts →
	Exact match “At HomeWorks Energy, our mission is simple, literally: Energy Efficiency, Simplified.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
15	Performance Services	Exact match	Indianapolis, IN, United StatesHQ recorded Oct 13, 2026	201-500	339 contacts →
	Exact match “We design and construct high-performing buildings and systems.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
16	Newcomb & Boyd, LLP	Exact match	Atlanta, GA, United StatesHQ recorded Oct 13, 2026	201-500	335 contacts →
	Exact match “Newcomb & Boyd is an integrated engineering partner helping owners, architects, and design teams create high-performing buildings that deliver lasting value.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
17	Cosentini Associates	Exact match	Nyc, NY, United StatesHQ recorded Oct 13, 2026	201-500	318 contacts →
	Exact match “Cosentini has a 70+ year history of engineering many of the world’s most iconic buildings.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
18	VLK	Exact match	Fort Worth, TX, United StatesHQ recorded Oct 13, 2026	201-500	282 contacts →
	Exact match “VLK designs exemplary environments, innovative structures, and sustainable communities for tomorrow.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
19	Kirksey Architecture	Exact match	Houston, TX, United StatesHQ recorded Oct 13, 2026	201-500	251 contacts →
	Exact match “We are Kirksey, a Texas-based architecture firm, passionate about great architecture and all things sustainable.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
20	Lime Energy	Exact match	Newark, NJ, United StatesHQ recorded Oct 13, 2026	201-500	248 contacts →
	Exact match “Lime Energy is building a new energy future.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
21	Zodiac	Exact match	St. Louis, MO, United StatesHQ recorded Oct 13, 2026	n/a	230 contacts →
	Exact match “Zodiac, Inc.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
22	PEG	Exact match	Fairfax, VA, United StatesHQ recorded Oct 13, 2026	201-500	216 contacts →
	Exact match “PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
23	Dalkia Energy Solutions	Exact match	Beverly, MA, United StatesHQ recorded Oct 13, 2026	201-500	213 contacts →
	Exact match “Dalkia Energy Solutions, a subsidiary of the EDF (Électricité de France) Group, is a national leader in energy efficiency and sustainability for commercial, industrial, and…” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
24	Energy Management Collaborative EMC	Exact match	Minneapolis, MN, United StatesHQ recorded Oct 13, 2026	201-500	207 contacts →
	Exact match “EMC manages and scales turnkey energy efficiency solutions for Fortune 500 clients across their North American portfolios.” Recorded in the RevenueBase company graph · Oct 13, 2026 · View company records in RevenueBase
25	Bright Power	Exact match	New York, NY, United StatesHQ recorded Oct 13, 2026	51-200	201 contacts →
	Exact match “Bright Power is a leading provider of energy efficiency and decarbonization solutions for the real estate industry.” Recorded in the RevenueBase company graph · Oct 13, 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 “green building and energy efficiency contractors”. 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 2,656 green building and energy efficiency contractors based in the United States

See the full list, filter by size, metro and specialty, and access 17,386 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Green building and energy efficiency contractors based in the United States at a glance

As of Oct 13, 2026

44.3%Verified-email coverage

14.8Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · New York

Oct 13, 2026Page data refreshed

Companies by employee count

1-10

1,551

11-50

847

51-200

193

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 2,656 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 the United States whose business descriptions match “green building and energy efficiency contractors” 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 17,386 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 October 13, 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.

Green building and energy efficiency contractors by metro

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 “green building and energy efficiency contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many green building and energy efficiency contractors are there based in the United States?

RevenueBase identified 2,656 company matches for green building and energy efficiency contractors associated with the United States as of October 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?

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

Which city has the most green building and energy efficiency contractors?

New York leads with 93 company records, followed by Portland (42) and Los Angeles (41).

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 17,386 professional contacts with verified work emails tracked across these 2,656 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 October 13, 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.