Top 50 Engineering Architecture Firms for 2025

Jacobs, AECOM, Kimley-Horn, Burns & McDonnell, EXP, Thornton Tomasetti, and SSOE top Building Design+Construction's ranking of the nation's largest engineering architecture (EA) firms for nonresidential buildings and multifamily buildings work, as reported in BD+C's 2025 Giants 400 Report.

By David Barista, Editorial Director

Sept. 15, 2025
100,000-sf Amazon Kuiper Payload Processing Facility at Kennedy Space Center, Cape Canaveral, Fla., Photo courtesy BRPH and Amazon
100,000-sf Amazon Kuiper Payload Processing Facility at Kennedy Space Center, Cape Canaveral, Fla., Photo courtesy BRPH and Amazon
The 100,000-sf Amazon Kuiper Payload Processing Facility at Kennedy Space Center, Cape Canaveral, Fla., will provide Amazon with the ability to process satellites into a launch vehicle payload at a faster pace. Designed by BRPH, the complex includes closed- area-compliance spaces, six large ISO-8 clean rooms, and a two-story office for support staff. Photo courtesy BRPH and Amazon

Jacobs, AECOM, Kimley-Horn, Burns & McDonnell, EXP, Thornton Tomasetti, and SSOE top Building Design+Construction's ranking of the nation's largest engineering architecture (EA) firms for nonresidential buildings and multifamily buildings work, as reported in BD+C's 2025 Giants 400 Report.

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Source: Building Design+Construction's 2025 Giants 400 Report

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