Company lists · Data refreshed September 2026

Top 25 Retrofit consulting companies worldwide

Name: Retrofit consulting companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 11,283 companies tracked

RevenueBase identified 11,283 retrofit consulting companies worldwide as of September 2026 and tracks 90,407 professional contacts across them, including 31,500 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers retrofit consulting companies 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 29, 2026. Country and city lists for retrofit consulting companies 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 29, 2026 86% judged on-target in blind review

11,283Companies

90,407Contacts tracked

31,500Verified emails

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The 25 largest retrofit consulting companies worldwide

Ranked by team size

Top 25 of 11,283 retrofit consulting companies worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to retrofit consulting companies: 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	OLA	Partial evidence	Austin, TX, United StatesHQ checked Sep 29, 2026	n/a	1,145 contacts →
	Partial 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 29, 2026
2	BTP Consultants	Indirect evidence	Montigny-le-bretonneux, FranceHQ checked Sep 29, 2026	201-500	1,066 contacts →
	Indirect evidence “BTP Consultants est un bureau de ̂, et présent à l'échelle nationale depuis plus de.” Source: RevenueBase Database · checked Sep 29, 2026
3	Simpson Gumpertz & Heger SGH	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 29, 2026	501-1,000	942 contacts →
	Indirect evidence “Simpson Gumpertz & Heger (SGH) is a national engineering firm committed to delivering holistic advice for our clients’ most complex challenges.” Source: RevenueBase Database · checked Sep 29, 2026
4	Syska Hennessy Group	Indirect evidence	New York, United StatesHQ checked Sep 29, 2026	501-1,000	803 contacts →
	Indirect evidence “Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.” Source: RevenueBase Database · checked Sep 29, 2026
5	Archetype Group	Partial evidence	Ho Chi Minh City, VietnamHQ checked Sep 29, 2026	1,001-5,000	801 contacts →
	Partial evidence “Archetype Group is a leading international construction consultancy company, we are shaping buildings that last with a full range of consulting services: Architecture & Master…” Source: RevenueBase Database · checked Sep 29, 2026
6	PAE	Indirect evidence	Portland, OR, United StatesHQ checked Sep 29, 2026	201-500	744 contacts →
	Indirect evidence “PAE provides mechanical and electrical engineering design, technology system design, energy modeling and analysis, and more.” Source: RevenueBase Database · checked Sep 29, 2026
7	Bengt Dahlgren	Indirect evidence	Stockholm, SwedenHQ checked Sep 29, 2026	501-1,000	602 contacts →
	Indirect evidence “Vi vill vara en föregångare i bygg- och fastighetsbranschen till effektiva, miljövänliga och motståndskraftiga fastigheter för människor att må bra i.” Source: RevenueBase Database · checked Sep 29, 2026
8	EBI Consulting	Indirect evidence	Burlington, MA, United StatesHQ checked Sep 29, 2026	501-1,000	535 contacts →
	Indirect evidence “For 35 years we have been helping investors, lenders, owners, developers, contractors, and property managers reduce risk and optimize their built facilities, infrastructure and…” Source: RevenueBase Database · checked Sep 29, 2026
9	Nova Engineering And Environmental, LLC	Partial evidence	Kennesaw, GA, United StatesHQ checked Sep 29, 2026	501-1,000	518 contacts →
	Partial evidence “Established in 1996, NOVA was originally founded to provide Environmental Consulting, Geotechnical Engineering, and Construction Materials Testing and Inspection services to the…” Source: RevenueBase Database · checked Sep 29, 2026
10	RTM Engineering Consultants	Partial evidence	Schaumburg, IL, United StatesHQ checked Sep 29, 2026	201-500	516 contacts →
	Partial evidence “We are an engineering firm that goes beyond a typical consulting role.” Source: RevenueBase Database · checked Sep 29, 2026
11	Groupe Acceo BET Energie, Ascenseur, Environnement, AMO & MOE Spécialisées	Indirect evidence	La Ciotat, FranceHQ checked Sep 29, 2026	501-1,000	488 contacts →
	Indirect evidence “ACCEO est un bureau d’études en bâtiment indépendant fondé en 2003 et spécialisé dans des domaines à forte technicité : Ascenseurs, Efficacité énergétique, Environnement, AMO et…” Source: RevenueBase Database · checked Sep 29, 2026
12	MBP Mcdonough Bolyard Peck	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 29, 2026	201-500	467 contacts →
	Partial evidence “MBP is a multi-disciplined consulting firm that provides a broad range of professional services designed to mitigate risk and optimize value within the built environment.” Source: RevenueBase Database · checked Sep 29, 2026
13	JW Consultants LLP	Partial evidence	Pune, IndiaHQ checked Sep 29, 2026	201-500	465 contacts →
	Partial evidence “JW Consultants LLP is among India's top Structural Consulting firms, providing services to architects, owners, contractors, and developers Since our establishment in 1975 as a…” Source: RevenueBase Database · checked Sep 29, 2026
14	Sitelogiq	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 29, 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 29, 2026
15	AEI Consultants	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 29, 2026	201-500	433 contacts →
	Partial evidence “AEI Consultants provides building, environmental, land and sustainability assessment and consulting services throughout North America.” Source: RevenueBase Database · checked Sep 29, 2026
16	Semac Construction LTD	Indirect evidence	Gurugram, IndiaHQ checked Sep 29, 2026	51-200	422 contacts →
	Indirect evidence “Semac was founded in 1969 as one of the first consultants in India to offer ASMEPF (Architectural, Structural, Mechanical, Electrical, Plumbing, Fire suppression, Air…” Source: RevenueBase Database · checked Sep 29, 2026
17	Deerns	Partial evidence	The Hague, NetherlandsHQ checked Sep 29, 2026	501-1,000	405 contacts →
	Partial evidence “Deerns is an independent engineering firm specialised in providing technical consulting and engineering solutions with almost 500 staff members in offices around the globe.” Source: RevenueBase Database · checked Sep 29, 2026
18	Arcxis	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	501-1,000	389 contacts →
	Indirect 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 29, 2026
19	Glumac	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 29, 2026	201-500	386 contacts →
	Indirect 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 29, 2026
20	P2s	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 29, 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 29, 2026
21	Wendel Companies	Indirect evidence	Williamsville, NY, United StatesHQ checked Sep 29, 2026	201-500	355 contacts →
	Indirect 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 29, 2026
22	RDH Building Science	Partial evidence	Burnaby, BC, CanadaHQ checked Sep 29, 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 29, 2026
23	Cosentini Associates	Indirect evidence	Nyc, NY, United StatesHQ checked Sep 29, 2026	201-500	306 contacts →
	Indirect evidence “Cosentini has a 70+ year history of engineering many of the world’s most iconic buildings.” Source: RevenueBase Database · checked Sep 29, 2026
24	Bhavna Corp	Indirect evidence	Noida, IndiaHQ checked Sep 29, 2026	201-500	306 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 29, 2026
25	Jva, INC	Partial evidence	Boulder, CO, United StatesHQ checked Sep 29, 2026	51-200	258 contacts →
	Partial evidence “JVA, Incorporated is an employee-owned consulting engineering firm with offices in Boulder, Fort Collins, Winter Park, Glenwood Springs, and Denver, Colorado.” Source: RevenueBase Database · checked Sep 29, 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: retrofit consulting companies. 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 retrofit consulting companies.
Partial evidence: Its own public description names part of retrofit consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name retrofit consulting companies. 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 11,283 retrofit consulting companies worldwide

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Retrofit consulting companies worldwide at a glance

As of Sep 29, 2026

34.8%Verified-email coverage

8.0Average contacts per company

1-10Median size (employees)

1.1%Largest-city concentration · Sao Paulo

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

7,719

11-50

2,813

51-200

535

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 retrofit consulting companies, 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: Every country. Country and city lists for retrofit consulting companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “retrofit consulting companies”. 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 retrofit consulting companies), 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 retrofit consulting companies, 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, 31,500 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 29, 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.

Retrofit consulting companies by location

50 lists · largest first

Every Retrofit consulting companies 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 retrofit consulting companies, 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 retrofit consulting companies are there worldwide?

RevenueBase identified 11,283 retrofit consulting companies 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?

OLA, headquartered in Austin, tops this list with the largest team on record.

Which country has the most retrofit consulting companies?

The United States leads with 2,673 companies, followed by France (1,013) and Germany (741). Every retrofit consulting companies list by country and city is linked on this page.

Which city has the most retrofit consulting companies?

Sao Paulo leads with 119 headquartered companies, followed by New York (118) and Paris (113).

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 31,500 verified decision-maker contacts tracked across these 11,283 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 29, 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.