Company lists · Data refreshed September 2026

Top 25 Energy efficient building contractors worldwide

Name: Energy efficient building contractors worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 10,158 companies tracked

RevenueBase identified 10,158 energy efficient building contractors worldwide as of September 2026 and tracks 154,829 professional contacts across them, including 44,739 with verified work emails and 0 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers energy efficient building contractors worldwide, 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. Country and city lists for energy efficient building contractors follow the table.

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

10,158Companies

154,829Contacts tracked

44,739Verified emails

0Mobile numbers

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The 25 largest energy efficient building contractors worldwide

Ranked by team size

Top 25 of 10,158 energy efficient building contractors worldwide, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to energy efficient building 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	Johnson Controls	Strong evidence	Cork, IrelandHQ checked Sep 16, 2026	10001+	52,736 contacts →
	Strong evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 16, 2026
2	Southland Industries	Strong evidence	Garden Grove, CA, United StatesHQ checked Sep 16, 2026	10001+	2,439 contacts →
	Strong evidence “As one of the nation's largest building systems experts, Southland Industries provides innovative, practical results for your engineering, construction, service, and energy needs.” Source: RevenueBase Database · checked Sep 16, 2026
3	Mckinstry	Partial evidence	Seattle, WA, United StatesHQ checked Sep 16, 2026	1,001-5,000	2,213 contacts →
	Partial evidence “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Source: RevenueBase Database · checked Sep 16, 2026
4	DLR Group	Partial evidence	30 Offices, MN, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,992 contacts →
	Partial evidence “DLR Group is an integrated design firm delivering architecture, engineering, interiors, planning, and building optimization for new construction, renovation, and adaptive reuse.” Source: RevenueBase Database · checked Sep 16, 2026
5	IMEG	Indirect evidence	Rock Island, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,985 contacts →
	Indirect evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 16, 2026
6	GK	Indirect evidence	Oslo, NorwayHQ checked Sep 16, 2026	1,001-5,000	1,150 contacts →
	Indirect evidence “GK er en ledende teknisk entreprenør og servicepartner.” Source: RevenueBase Database · checked Sep 16, 2026
7	OLA	Indirect evidence	Austin, TX, United StatesHQ checked Sep 16, 2026	n/a	1,145 contacts →
	Indirect evidence “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Source: RevenueBase Database · checked Sep 16, 2026
8	Affiliated Engineers, INC	Strong evidence	Madison, WI, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,012 contacts →
	Strong evidence “Affiliated Engineers, Inc.(AEI) provides engineering leadership and whole-mission solutions for complex building, energy, and utility projects.” Source: RevenueBase Database · checked Sep 16, 2026
9	Mapa Group	Indirect evidence	Ankara, TürkiyeHQ checked Sep 16, 2026	10001+	959 contacts →
	Indirect evidence “Mapa Group has emerged as a global leader in the engineering and construction industry, now spanning three continents.” Source: RevenueBase Database · checked Sep 16, 2026
10	VAN Dorp	Indirect evidence	Zoetermeer, NetherlandsHQ checked Sep 16, 2026	1,001-5,000	873 contacts →
	Indirect evidence “Bij Van Dorp zijn wij ervan doordrongen dat wij de wereld niet voor onszelf hebben.” Source: RevenueBase Database · checked Sep 16, 2026
11	Introba	Partial evidence	St Louis, MO, United StatesHQ checked Sep 16, 2026	1,001-5,000	822 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 16, 2026
12	Syska Hennessy Group	Indirect evidence	New York, United StatesHQ checked Sep 16, 2026	501-1,000	803 contacts →
	Indirect evidence “Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.” Source: RevenueBase Database · checked Sep 16, 2026
13	PAE	Partial evidence	Portland, OR, United StatesHQ checked Sep 16, 2026	201-500	744 contacts →
	Partial evidence “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Source: RevenueBase Database · checked Sep 16, 2026
14	Albireo Energy	Strong evidence	Edison, NJ, United StatesHQ checked Sep 16, 2026	1,001-5,000	669 contacts →
	Strong evidence “Albireo Energy is a leading independent building controls and energy services provider recognized by customers for creating intelligent, high-performance buildings.” Source: RevenueBase Database · checked Sep 16, 2026
15	Vanderweil Engineers	Indirect evidence	Boston, MA, United StatesHQ checked Sep 16, 2026	201-500	545 contacts →
	Indirect evidence “Vanderweil is a mechanical, electrical, plumbing, fire protection, technology, sustainability, commissioning, and power engineering firm dedicated to providing customized and…” Source: RevenueBase Database · checked Sep 16, 2026
16	Sitelogiq	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 16, 2026	501-1,000	450 contacts →
	Indirect evidence “SitelogIQ provides design, engineering, and construction management services that help organizations nationwide modernize their facilities and infrastructure.” Source: RevenueBase Database · checked Sep 16, 2026
17	Estudio Architecture	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	n/a	390 contacts →
	Indirect evidence “eStudio is a specialized full service architectural and boutique design firm.” Source: RevenueBase Database · checked Sep 16, 2026
18	Arcxis	Partial evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	389 contacts →
	Partial evidence “ARCXIS (Formerly DPIS Builder Services), is the largest provider of HERS inspections, ENERGY STAR ratings, engineering and design, construction quality assurance and other builder…” Source: RevenueBase Database · checked Sep 16, 2026
19	Glumac	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 16, 2026	201-500	386 contacts →
	Partial evidence “Glumac, a Tetra Tech Company, is a global leader in building engineering, committed to delivering a low carbon future for all.” Source: RevenueBase Database · checked Sep 16, 2026
20	P2s	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 16, 2026	201-500	375 contacts →
	Indirect evidence “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Source: RevenueBase Database · checked Sep 16, 2026
21	IES LTD	Indirect evidence	Glasgow, United KingdomHQ checked Sep 16, 2026	201-500	374 contacts →
	Indirect evidence “IES is an innovative company at the forefront of the development and application of powerful software simulation tools and consulting services for architects, engineers and others…” Source: RevenueBase Database · checked Sep 16, 2026
22	Newcomb & Boyd, LLP	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 16, 2026	201-500	363 contacts →
	Indirect evidence “We help clients design and operate facilities that remain resilient, reliable, and ready for what's next.” Source: RevenueBase Database · checked Sep 16, 2026
23	Wendel Companies	Strong evidence	Williamsville, NY, United StatesHQ checked Sep 16, 2026	201-500	355 contacts →
	Strong evidence “Wendel is an Architecture, Engineering, Energy Efficiency, and Construction Management Firm that delivers customized solutions and turnkey projects in innovative ways.” Source: RevenueBase Database · checked Sep 16, 2026
24	Butler Manufacturing	Partial evidence	Kansas City, MO, United StatesHQ checked Sep 16, 2026	1,001-5,000	354 contacts →
	Partial evidence “Butler Manufacturing, a BlueScope Buildings North America brand, is known for our commitment to quality, providing nonresidential construction clients with a comprehensive…” Source: RevenueBase Database · checked Sep 16, 2026
25	RDH Building Science	Partial evidence	Burnaby, BC, CanadaHQ checked Sep 16, 2026	201-500	335 contacts →
	Partial evidence “RDH is a multidisciplinary consulting firm specializing in building performance, durability, and resilience.” 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: energy efficient building 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 energy efficient building contractors.
Partial evidence: Its own public description names part of energy efficient building contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy efficient building 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 25 of 10,158 energy efficient building contractors worldwide

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Energy efficient building contractors worldwide at a glance

As of Sep 16, 2026

28.9%Verified-email coverage

15.2Average contacts per company

1-10Median size (employees)

1.3%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

6,458

11-50

2,850

51-200

605

201-500

103

501-1,000

1,001-5,000

5,001-10,000

10001+

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 energy efficient building 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.
Coverage: 34 countries, largest first: the United States, Germany, Italy, France, Spain, the United Kingdom, India, Canada, the Netherlands, Switzerland and 24 more. Country and city lists for energy efficient building contractors are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “energy efficient building 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 energy efficient building 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 energy efficient building contractors, and records with no verified work email.
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, 44,739 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.

Energy efficient building contractors by location

54 lists · largest first

Every Energy efficient building contractors list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 energy efficient building 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 energy efficient building contractors are there worldwide?

RevenueBase identified 10,158 energy efficient building contractors worldwide 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?

Johnson Controls, headquartered in Milwaukee, tops this list with the largest team on record.

Which country has the most energy efficient building contractors?

The United States leads with 2,162 companies, followed by Germany (1,062) and Italy (843). Every energy efficient building contractors list by country and city is linked on this page.

Which city has the most energy efficient building contractors?

London leads with 137 headquartered companies, followed by Paris (100) and Madrid (99).

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 44,739 verified decision-maker contacts tracked across these 10,158 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.