Arcadis North America, Gensler, Stantec, KTGY, Perkins Eastman, AO, SCB, Niles Bolton Associates, and HCM top Building Design+Construction's ranking of the nation's largest multifamily housing sector architecture and architecture/engineering (AE) firms for 2026, as reported in BD+C's 2026 Giants 400 Report.

Check out all 2026 Multifamily Giants rankings: 

• Top 200 Multifamily Architecture Firms
• Top 90 Multifamily Engineering Firms
• Top 115 Multifamily Construction Firms
• Top 170 Apartment and Condominium Architecture Firms
• Top 80 Apartment and Condominium Engineering Firms
• Top 100 Apartment and Condominium Construction Firms
• Top 100 Senior Living Facility Architecture Firms
• Top 40 Senior Living Facility Engineering Firms
• Top 50 Senior Living Facility Construction Firms
• Top 80 Student Housing Architecture Firms
• Top 40 Student Housing Engineering Firms
• Top 40 Student Housing Construction Firms

Source: Building Design+Construction's 2026 Giants 400 Report