Company lists · Data refreshed September 2026

Top 25 Retrofit consulting companies worldwide

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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceAustin, TX, United StatesHQ checked Sep 29, 2026n/a1,145 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
2Indirect evidenceMontigny-le-bretonneux, FranceHQ checked Sep 29, 2026201-5001,066 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
3Indirect evidenceWaltham, MA, United StatesHQ checked Sep 29, 2026501-1,000942 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
4Indirect evidenceNew York, United StatesHQ checked Sep 29, 2026501-1,000803 contacts →

Indirect evidence

“Consult Engineer Commission At Syska Hennessy Group, we create exceptional environments.”

Source: RevenueBase Database · checked Sep 29, 2026
5Partial evidenceHo Chi Minh City, VietnamHQ checked Sep 29, 20261,001-5,000801 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
6Indirect evidencePortland, OR, United StatesHQ checked Sep 29, 2026201-500744 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
7Indirect evidenceStockholm, SwedenHQ checked Sep 29, 2026501-1,000602 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
8Indirect evidenceBurlington, MA, United StatesHQ checked Sep 29, 2026501-1,000535 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
9Partial evidenceKennesaw, GA, United StatesHQ checked Sep 29, 2026501-1,000518 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
10Partial evidenceSchaumburg, IL, United StatesHQ checked Sep 29, 2026201-500516 contacts →

Partial evidence

“We are an engineering firm that goes beyond a typical consulting role.”

Source: RevenueBase Database · checked Sep 29, 2026
11Indirect evidenceLa Ciotat, FranceHQ checked Sep 29, 2026501-1,000488 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
12Partial evidenceFairfax, VA, United StatesHQ checked Sep 29, 2026201-500467 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
13Partial evidencePune, IndiaHQ checked Sep 29, 2026201-500465 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
14Indirect evidenceMinneapolis, MN, United StatesHQ checked Sep 29, 2026501-1,000450 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
15Partial evidenceWalnut Creek, CA, United StatesHQ checked Sep 29, 2026201-500433 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
16Indirect evidenceGurugram, IndiaHQ checked Sep 29, 202651-200422 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
17Partial evidenceThe Hague, NetherlandsHQ checked Sep 29, 2026501-1,000405 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
18Indirect evidenceHouston, TX, United StatesHQ checked Sep 29, 2026501-1,000389 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
19Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 29, 2026201-500386 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
20Indirect evidenceLong Beach, CA, United StatesHQ checked Sep 29, 2026201-500375 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
21Indirect evidenceWilliamsville, NY, United StatesHQ checked Sep 29, 2026201-500355 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
22Partial evidenceBurnaby, BC, CanadaHQ checked Sep 29, 2026201-500335 contacts →

Partial evidence

“RDH is a multidisciplinary consulting firm specializing in building performance, durability, and resilience.”

Source: RevenueBase Database · checked Sep 29, 2026
23Indirect evidenceNyc, NY, United StatesHQ checked Sep 29, 2026201-500306 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
24Indirect evidenceNoida, IndiaHQ checked Sep 29, 2026201-500306 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 29, 2026
25Partial evidenceBoulder, CO, United StatesHQ checked Sep 29, 202651-200258 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

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
97
501-1,000
26
1,001-5,000
10
5,001-10,000
4
10001+
1

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.