People wait on a subway platform as a train arrives; colorful geometric tile art decorates the wall above the platform, and escalators are in the foreground.
Port of Portland, Oregon, PDX Next Terminal Core Redevelopment, Main Terminal, by ZGF. Photography by Ema Peter.

September 3, 2026

Words: Interior Design Staff

Interior Design’s 2026 Sustainability Giants Are On The Up And Up

Good news for the health of the industry and the planet: Fees generated from projects with sustainability goals jumped 10 percent, to an average of 50—about half of Giants firms’ output. A majority of those projects followed such principles as LEED or WELL but did not ultimately pursue certification, mostly as a result of clients not wanting to pay. On the product front, the percentage of FF&C that was specified for its contributions to sustainability remained steady.

2026 Sustainability Giants

2026 Rank Firm Headquarters Sustainability Fees (in millions) FF&C Value (in millions) ID Staff 2025 Rank
1 Gensler San Francisco 872.7 2,975 1
2 Jacobs Dallas 345.4 120.9 1,100 10
3 Perkins&Will Chicago 340.9 12,627.3 912 2
4 AECOM Dallas 171.6 2,640.2 480 5
5 HDR Omaha, NE 156.4 2,852.0 305 7
6 CannonDesign New York 153.0 4
7 HKS Dallas 124.7 150 3
8 Arcadis Amsterdam 75.0 1,200.0 340 6
9 NBBJ Seattle 66.5 15
10 SmithGroup Detroit 55.4 471 11
11 ZGF Portland, OR 54.4 12
12 DLR Group Seattle 48.3 9.7 1,250 13
13 Skidmore, Owings & Merrill New York 48.0 99 14
14 Perkins Eastman New York 42.0 2,000.0 279 16
15 ASD|SKY Atlanta 42.0 193 0
16 EwingCole Philadelphia 39.9 469.2 114 26
17 Flad Architects Madison, WI 38.9 5,394.7 256 20
18 Corgan Dallas 38.1 3,435.0 312 8
19 Ted Moudis Associates New York 34.0 720.0 75 17
20 TRIO Denver 27.5 19.6 41 0
21 Ware Malcomb Irvine, CA 26.3 1,753.0 394 83
22 CO Architects Los Angeles 26.0 7.3 55 25
23 HGA Minneapolis 24.4 116 19
24 HLW New York 24.2 1,180.2 145 21
25 JLL Chicago 22.8 35.9 233 0
26 TPG Architecture New York 18.4 182 18
27 Mancini Duffy New York 17.6 50 27
28 LEO A DALY Omaha, NE 16.2 176 86
29 STUDIOS Architecture Washington 15.7 169 39
30 SMMA Cambridge, MA 12.9 145.0 77 31
31 Mithun Seattle 12.8 65 0
32 Ballinger Philadelphia 12.3 92 32
33 JCJ Architecture Hartford, CT 10.7 59 65
34 PGAL Houston 10.0 108 38
35 The Switzer Group New York 9.7 845.0 51 50
36 SJ Group N/A 9.5 1,200.0 71 0
37 HED Royal Oak, MI 9.4 427.5 193 37
38 CBT Boston 9.3 49 36
39 Hord Coplan Macht Baltimore 8.9 267.8 47 44
40 M Moser Associates Hong Kong 8.4 1,214.0 759 41
41 KZF Design Cincinnati 8.4 775.0 40 40
42 Rowland+Broughton Aspen, CO 7.5 8.5 16 0
43 Little Diversified Architectural Consulting Charlotte, NC 7.1 491.9 324 0
44 The Miller Hull Partnership Seattle 6.2 72.0 44 57
45 Hendy Newport Beach, CA 6.0 0.2 30 52
46 CHAMBERS Baltimore 5.9 135.0 34 54
47 LMN Washington 5.9 263.7 43 51
48 Baskervill Richmond, VA 5.6 13.4 75 60
49 Cooper Carry Atlanta 5.5 19.2 88 0
50 Woods Bagot Sydney 5.4 688 0
51 IA Interior Architects San Francisco 5.4 3,168.0 424 0
52 American Structurepoint Indianapolis 5.0 1,660.0 48 0
53 Private Label International Phoenix 4.7 5.0 9 59
54 Stantec Edmonton, Canada 4.6 234 24
55 iN STUDIO Toronto 4.5 103.1 35 64
56 HOK St. Louis 4.4 6,543.0 326 55
57 sshape Washington 4.2 100.0 32 58
58 Chipman Design Architecture Des Plaines, IL 4.0 350.0 20 73
59 Hartman Design Group Rockville, MD 4.0 9.0 17 0
60 FXCollaborative Architects Brooklyn, NY 4.0 176.0 58 35
61 HMC Architects Ontario, CA 3.6 154 30
62 Clark Nexsen, a JMT Company Virginia Beach, VA 3.3 100.0 13 78
63 Hanbury Norfolk, VA 3.3 2,500.0 89 0
64 Helix Architecture + Design Kansas City, MO 3.2 175.2 15 0
65 RATIO Design Indianapolis 2.9 92.9 87 68
66 INC Architecture & Design New York 2.7 2,386.1 36 0
67 Faulkner Design Group Dallas 2.6 12.3 15 0
68 Meyer Davis Studio New York 2.6 4.3 109 62
69 Vocon Cleveland 2.6 817.7 204 77
70 Huntsman Architectural Group San Francisco 2.5 135.8 46 66
71 DesignAgency Toronto 2.5 0.9 100 0
72 Steelman Partners Las Vegas 2.5 95.0 11 33
73 Studio DADO Coral Gables, FL 2.5 1.5 33 0
74 Architecture, Incorporated Reston, VA 2.4 9.3 12 79
75 KPF New York 2.4 185 0
76 Symmetry 8 Studio Irvine, CA 2.2 93.7 8 0
77 Hendrick Atlanta 2.2 100.0 24 69
78 Ryan Young Interiors National City, CA 2.1 13.5 44 85
79 Vida Design Portland, OR 2.1 450.0 56 49
80 Legat Architects Oak Brook, IL 2.1 580.5 5 53
81 The Society Seattle 2.0 280.0 13 0
82 Spacesmith New York 1.9 1.9 31 87
83 Ankrom Moisan Portland, OR 1.9 0.9 70 0
84 Kay Lang + Associates Los Angeles 1.8 45.0 13 90
85 Sargenti Architects Paramus, NJ 1.8 109 93
86 Elkus Manfredi Architects Boston 1.6 150.0 120 92
87 Cushing Terrell Billings, MO 1.6 896.4 42 82
88 Fentress Studios a Populous Company Denver 1.6 20.5 66 0
89 JPC Architects Bellevue, WA 1.6 45 0
90 Studio G Architects Campbell, CA 1.6 312.5 24 95
91 Meyer Design Ardmore, PA 1.5 215.0 58 84
92 //3877 Washington 1.5 3.0 38 97
93 Starrdesign Charlotte, NC 1.5 25.0 7 0
94 Anderson Mikos Architects Oak Brook, IL 1.5 38.7 9 0
95 Array Architects Conshohocken, PA 1.5 650.0 29 0
96 Rottet Studio New York 1.3 3.8 54 0
97 Stonehill Taylor New York 1.2 800.0 40 100
98 Mazzarini & Co. New York 1.2 65.0 13 0
99 Aedifica Montreal 1.2 64 0
100 ESG Architecture & Interior Design Minneapolis 1.1 48 0

*Blank cells indicate no data reported

Interested in learning more about Interior Design’s 2026 Giants of Design? Check out our reports for Top 100 Giants, Rising Giants, Hospitality Giants, Healthcare Giants, and Sustainability Giants.

Sustainability Giants Snapshot

  • 50% of design fees from projects with measurable sustainability goals
  • 10% YoY increase
  • 61% of FF&C specified for sustainable contribution

Percentage of projects for which firms…

Sustainability Metrics Percentage of Projects
Tracked embodied carbon 15
Achieved LEED certification 8
Achieved WELL certification 4
Followed the below principles, but client did not certify 40

Firms with the most projects tracking embodied carbon

  • AECOM at 277 projects
  • Mithun at 86% of all firm projects

Firms with the most projects achieving LEED certification 

  • Skidmore, Owings & Merrill at 58 projects
  • CO Architects at 74% of all firm projects

Firms with the most projects achieving WELL certification

  • Sargenti Architects at 35 projects
  • Skidmore, Owings & Merrill at 15% of all firm projects

Methodology

The Interior Design Giants annual business survey comprises the largest firms ranked by interior design fees for the 12-month period ending December 31, 2025. The listings are generated from only those surveyed. To be recognized as a top 100, Rising, Healthcare, Hospitality, or Sustainability Giant, firms must meet the following criteria: Have at least one office location in North America, and generate at least 25% of its interior design fee income in North America. Firms that do not meet the criteria are ranked on our International Giants list. Interior design fees include those attributed to:

1. All aspects of a firm’s in­terior design practice, from strategic planning and programming to design and project management.

2. Fees paid to a firm for work performed by employees and independent contractors who are “full-time staff equivalent.”

Interior design fees do not include revenues paid to a firm and remitted to subcontractors who are not con­sid­ered full-time staff equivalents. For example, certain firms attract work that is subcontracted to a local firm. The originating firm may collect all the fees and re­tain a management or generation fee, paying the remainder to the performing firm. The amounts paid to the latter are not included in fees of the collecting firm when determining its ranking. Ties are broken by rank from last year. Where applicable, all per­cent­ages are based on responding Giants, not their total number. 

All research conducted by ThinkLab, the research division of SANDOW Design Group.

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