Company lists · Data refreshed September 2026

Top 25 Architectural consulting firms worldwide

Name: Architectural consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 63,463 companies tracked

RevenueBase identified 63,463 architectural consulting firms worldwide as of September 2026 and tracks 769,927 professional contacts across them, including 331,716 with verified work emails and 168,764 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers architectural consulting firms 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 28, 2026. Country and city lists for architectural consulting firms 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 28, 2026 86% judged on-target in blind review

63,463Companies

769,927Contacts tracked

331,716Verified emails

168,764Mobile numbers

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The 25 largest architectural consulting firms worldwide

Ranked by team size

Top 25 of 63,463 architectural consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to architectural consulting firms: 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	Arcadis	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 28, 2026	10001+	33,846 contacts →
	Indirect evidence “Arcadis is a leading global partner, delivering transformative projects with businesses, cities and industries.” Source: RevenueBase Database · checked Sep 28, 2026
2	Stantec	Indirect evidence	Edmonton, AB, CanadaHQ checked Sep 28, 2026	10001+	28,416 contacts →
	Indirect evidence “Stantec empowers clients, people, and communities to rise to the world’s greatest challenges at a time when the world faces more unprecedented concerns than ever before.” Source: RevenueBase Database · checked Sep 28, 2026
3	ARUP	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	10001+	21,018 contacts →
	Indirect evidence “We guide, plan and design the future of the built environment.” Source: RevenueBase Database · checked Sep 28, 2026
4	SWECO	Indirect evidence	Stockholm, SwedenHQ checked Sep 28, 2026	10001+	18,445 contacts →
	Indirect evidence “Sweco is at the heart of the green transition - planning and designing the sustainable communities and cities of the future.” Source: RevenueBase Database · checked Sep 28, 2026
5	Ramboll	Partial evidence	Copenhagen, DenmarkHQ checked Sep 28, 2026	10001+	15,715 contacts →
	Partial evidence “Ramboll is a global architecture, engineering and consultancy company founded in Denmark in 1945.” Source: RevenueBase Database · checked Sep 28, 2026
6	Kimley-Horn	Partial evidence	Raleigh, NC, United StatesHQ checked Sep 28, 2026	5,001-10,000	10,117 contacts →
	Partial evidence “Kimley-Horn is one of the nation’s premier planning and design consulting firms.” Source: RevenueBase Database · checked Sep 28, 2026
7	WSP In The U.S	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	10001+	9,318 contacts →
	Indirect evidence “What if you could shape built and natural environments – and the future of those that use them?” Source: RevenueBase Database · checked Sep 28, 2026
8	Drees & Sommer	Partial evidence	Stuttgart, GermanyHQ checked Sep 28, 2026	5,001-10,000	3,475 contacts →
	Partial evidence “Uniting opposites to create a world we want to live in Drees & Sommer is a partner-managed, global consulting company providing a single source of consultation and implementation…” Source: RevenueBase Database · checked Sep 28, 2026
9	Rider Levett Bucknall RLB	Indirect evidence	Sydney, United KingdomHQ checked Sep 28, 2026	1,001-5,000	3,299 contacts →
	Indirect evidence “RLB.” Source: RevenueBase Database · checked Sep 28, 2026
10	Perkins&will	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,958 contacts →
	Indirect evidence “Since 1935, we’ve believed that design has the power to make the world a better, more beautiful place.” Source: RevenueBase Database · checked Sep 28, 2026
11	Dewberry	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,795 contacts →
	Indirect evidence “Dewberry is a leading, market-facing firm with a proven history of providing professional services to a wide variety of public- and private-sector clients.” Source: RevenueBase Database · checked Sep 28, 2026
12	HOK	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,614 contacts →
	Indirect evidence “HOK is a global interdisciplinary design firm.” Source: RevenueBase Database · checked Sep 28, 2026
13	Multiconsult	Strong evidence	Oslo, NorwayHQ checked Sep 28, 2026	1,001-5,000	2,553 contacts →
	Strong evidence “Multiconsult Norway is one of the leading firms of architectures, consulting engineers and designers in Norway.” Source: RevenueBase Database · checked Sep 28, 2026
14	Hks, INC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,462 contacts →
	Indirect evidence “We are a global firm of architects, designers, planners and advisors who create places noted for their beauty and performance.” Source: RevenueBase Database · checked Sep 28, 2026
15	The Haskell Company	Strong evidence	Jacksonville, FL, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,213 contacts →
	Strong evidence “Haskell delivers over $3 billion annually in Architecture, Engineering, Construction (AEC) and Consulting solutions to assure certainty of outcome for complex capital projects…” Source: RevenueBase Database · checked Sep 28, 2026
16	Colliers Engineering & Design	Strong evidence	Holmdel, NJ, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,049 contacts →
	Strong evidence “Colliers Engineering & Design, an affiliate of Colliers, is a trusted provider of multi-discipline engineering and architecture, design and consulting services to public and…” Source: RevenueBase Database · checked Sep 28, 2026
17	DLR Group	Partial evidence	30 Offices, MN, United StatesHQ checked Sep 28, 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 28, 2026
18	IMEG	Indirect evidence	Rock Island, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,985 contacts →
	Indirect evidence “Leaders in Engineering and Innovation.” Source: RevenueBase Database · checked Sep 28, 2026
19	Skidmore, Owings & Merrill SOM	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,967 contacts →
	Indirect evidence “Skidmore, Owings & Merrill (SOM) is a global practice of architects, designers, engineers, and planners, responsible for some of the world’s most technically and environmentally…” Source: RevenueBase Database · checked Sep 28, 2026
20	Smithgroup	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,849 contacts →
	Indirect evidence “SmithGroup is an award-winning, multi-national integrated design firm that employs research, data, advanced technologies and design thinking to help clients solve their greatest…” Source: RevenueBase Database · checked Sep 28, 2026
21	Clayco	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,720 contacts →
	Partial evidence “Clayco is a full-service, turnkey real estate development, master planning, architecture, engineering, and construction firm that safely delivers clients across North America the…” Source: RevenueBase Database · checked Sep 28, 2026
22	Ssoe Group	Partial evidence	Toledo, OH, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,603 contacts →
	Partial evidence “As an internationally ranked architecture and engineering firm, SSOE is known for delivering unparalleled client value that advances the AEC industry.” Source: RevenueBase Database · checked Sep 28, 2026
23	IA Interior Architects	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	501-1,000	1,584 contacts →
	Partial evidence “Celebrating 40 years of visionary design and innovation, IA Interior Architects is the first global architecture firm focused exclusively on interiors.” Source: RevenueBase Database · checked Sep 28, 2026
24	BW Design Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,555 contacts →
	Indirect evidence “BW Design Group is the only independent, fully integrated AEC firm powered by a Manufacturer's Mindset™.” Source: RevenueBase Database · checked Sep 28, 2026
25	Gresham Smith	Partial evidence	Nashville, TN, United StatesHQ checked Sep 28, 2026	501-1,000	1,430 contacts →
	Partial evidence “Gresham Smith is a premier architecture, engineering and consultancy services firm dedicated to creating healthy and thriving communities.” Source: RevenueBase Database · checked Sep 28, 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: architectural consulting firms. 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 architectural consulting firms.
Partial evidence: Its own public description names part of architectural consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name architectural consulting firms. 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 63,463 architectural consulting firms worldwide

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Architectural consulting firms worldwide at a glance

As of Sep 28, 2026

43.1%Verified-email coverage

21.9%Mobile-number coverage

12.1Average contacts per company

1-10Median size (employees)

2.4%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

44,823

11-50

15,047

51-200

2,452

201-500

390

501-1,000

117

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 architectural consulting firms, 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: 42 countries, largest first: the United States, the United Kingdom, Brazil, France, Germany, Spain, Italy, Australia, Canada, the Netherlands and 32 more. Country and city lists for architectural consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “architectural consulting firms”. 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 architectural consulting firms), 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 architectural consulting firms, 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, 331,716 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 28, 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.

Architectural consulting firms by location

286 lists · largest first

Every Architectural consulting firms 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 architectural consulting firms, 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 architectural consulting firms are there worldwide?

RevenueBase identified 63,463 architectural consulting firms 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?

Arcadis, headquartered in Amsterdam, tops this list with the largest team on record.

Which country has the most architectural consulting firms?

The United States leads with 18,129 companies, followed by the United Kingdom (5,357) and Brazil (5,004). Every architectural consulting firms list by country and city is linked on this page.

Which city has the most architectural consulting firms?

London leads with 1553 headquartered companies, followed by Sao Paulo (1248) and New York (1109).

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 331,716 verified decision-maker contacts tracked across these 63,463 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 28, 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.