Company lists · Data refreshed September 2026

Top 25 Retrofit consultants worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 26,817 companies tracked

RevenueBase identified 26,817 retrofit consultants worldwide as of September 2026 and tracks 270,143 professional contacts across them, including 88,307 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers retrofit consultants 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 consultants 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

26,817Companies

270,143Contacts tracked

88,307Verified emails

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The 25 largest retrofit consultants worldwide

Ranked by team size

Top 25 of 26,817 retrofit consultants worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to retrofit consultants: 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	Sargent & Lundy	Indirect evidence	Chicago, WY, United StatesHQ checked Sep 29, 2026	1,001-5,000	4,156 contacts →
	Indirect evidence “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Source: RevenueBase Database · checked Sep 29, 2026
2	KEO International Consultants	Indirect evidence	Safat, KuwaitHQ checked Sep 29, 2026	1,001-5,000	3,038 contacts →
	Indirect evidence “From shaping iconic skylines to crafting sustainable communities, KEO builds legacies for a better tomorrow.” Source: RevenueBase Database · checked Sep 29, 2026
3	Langan Engineering & Environmental Services	Indirect evidence	Parsippany, NJ, United StatesHQ checked Sep 29, 2026	1,001-5,000	2,177 contacts →
	Indirect evidence “Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Source: RevenueBase Database · checked Sep 29, 2026
4	IMEG	Indirect evidence	Rock Island, IL, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,985 contacts →
	Indirect evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 29, 2026
5	Atwell, LLC	Indirect evidence	Southfield, MI, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,290 contacts →
	Indirect evidence “Atwell is a full-service consulting, engineering and construction services firm that delivers a broad range of creative solutions to clients in the real estate and land…” Source: RevenueBase Database · checked Sep 29, 2026
6	OLA	Indirect evidence	Austin, TX, United StatesHQ checked Sep 29, 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 29, 2026
7	Zuhair Fayez	Indirect evidence	Riyadh, Saudi ArabiaHQ checked Sep 29, 2026	1,001-5,000	1,113 contacts →
	Indirect evidence “Zuhair Fayez stands as the region's foremost engineering and consulting firm, renowned for our innovative approach in architecture, project management, and oil and gas services.” Source: RevenueBase Database · checked Sep 29, 2026
8	Hoare LEA	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	501-1,000	1,103 contacts →
	Partial evidence “We are an award-winning engineering consultancy with a creative team of engineers, designers, and technical specialists.” Source: RevenueBase Database · checked Sep 29, 2026
9	BTP Consultants	Partial evidence	Montigny-le-bretonneux, FranceHQ checked Sep 29, 2026	201-500	1,066 contacts →
	Partial evidence “BTP Consultants est un bureau de ̂, et présent à l'échelle nationale depuis plus de.” Source: RevenueBase Database · checked Sep 29, 2026
10	Granlund	Indirect evidence	Helsinki, FinlandHQ checked Sep 29, 2026	1,001-5,000	1,027 contacts →
	Indirect evidence “Granlund on voimakkaasti kasvava kiinteistö- ja rakennusalan asiantuntijayhtiö.” Source: RevenueBase Database · checked Sep 29, 2026
11	Affiliated Engineers, INC	Indirect evidence	Madison, WI, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,012 contacts →
	Indirect evidence “Affiliated Engineers, Inc.(AEI) provides engineering leadership and whole-mission solutions for complex building, energy, and utility projects.” Source: RevenueBase Database · checked Sep 29, 2026
12	Mapa Group	Indirect evidence	Ankara, TürkiyeHQ checked Sep 29, 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 29, 2026
13	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
14	BPA	Indirect evidence	Montréal, QC, CanadaHQ checked Sep 29, 2026	1,001-5,000	882 contacts →
	Indirect evidence “IMPACTFUL ENGINEERING At BPA, it’s simple: we are building experts.” Source: RevenueBase Database · checked Sep 29, 2026
15	Robert Bird Group	Partial evidence	Brisbane, AustraliaHQ checked Sep 29, 2026	501-1,000	872 contacts →
	Partial evidence “Robert Bird Group (RBG), member of the Surbana Jurong Group, is a specialist structural, civil and construction engineering consultancy with over 800 employees across 12 offices…” Source: RevenueBase Database · checked Sep 29, 2026
16	ARE OY	Indirect evidence	Vantaa, FinlandHQ checked Sep 29, 2026	1,001-5,000	851 contacts →
	Indirect evidence “Dedicated to engineering a better life for your building.” Source: RevenueBase Database · checked Sep 29, 2026
17	Introba	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 29, 2026	1,001-5,000	822 contacts →
	Indirect 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 29, 2026
18	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
19	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
20	Freyssinet Saudi Arabia	Indirect evidence	Jeddah, Saudi ArabiaHQ checked Sep 29, 2026	1,001-5,000	784 contacts →
	Indirect evidence “FREYSSINET SAUDI ARABIA CO.” Source: RevenueBase Database · checked Sep 29, 2026
21	Concrejato Engenharia	Partial evidence	São Paulo, BrazilHQ checked Sep 29, 2026	1,001-5,000	765 contacts →
	Partial evidence “Criada na década de 1970, a Concrejato é especializada na execução de serviços técnicos de retrofit e restauro de edificações, recuperação e reforço estrutural, obras industriais…” Source: RevenueBase Database · checked Sep 29, 2026
22	RJC Engineers	Indirect evidence	Vancouver, BC, CanadaHQ checked Sep 29, 2026	501-1,000	745 contacts →
	Indirect evidence “We are on a mission to futureproof North America.” Source: RevenueBase Database · checked Sep 29, 2026
23	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
24	Smith Andersen	Indirect evidence	Toronto, ON, CanadaHQ checked Sep 29, 2026	501-1,000	672 contacts →
	Indirect evidence “What does it take to be one of Canada’s most respected integrated engineering firms?” Source: RevenueBase Database · checked Sep 29, 2026
25	Arif & Bintoak	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 29, 2026	501-1,000	644 contacts →
	Indirect evidence “Arif & Bintoak Consulting Architects and Engineers was established in 1975 by civil engineers Mr.” 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 consultants. 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 consultants.
Partial evidence: Its own public description names part of retrofit consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name retrofit consultants. 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 26,817 retrofit consultants worldwide

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Retrofit consultants worldwide at a glance

As of Sep 29, 2026

32.7%Verified-email coverage

10.1Average contacts per company

1-10Median size (employees)

1.7%Largest-city concentration · Sao Paulo

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

16,141

11-50

8,061

51-200

1,905

201-500

322

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 consultants, 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 consultants are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “retrofit consultants”. 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 consultants), 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 consultants, 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, 88,307 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 consultants by location

111 lists · largest first

Every Retrofit consultants 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 consultants, 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 consultants are there worldwide?

RevenueBase identified 26,817 retrofit consultants 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?

Sargent & Lundy, headquartered in Casper, tops this list with the largest team on record.

Which country has the most retrofit consultants?

The United States leads with 4,306 companies, followed by Brazil (2,216) and France (1,927). Every retrofit consultants list by country and city is linked on this page.

Which city has the most retrofit consultants?

Sao Paulo leads with 455 headquartered companies, followed by London (243) and Paris (200).

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 88,307 verified decision-maker contacts tracked across these 26,817 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.