| Rank | Company | 2012 Office Revenue ($) |
| 1 | AECOM Technology Corp. | $830,320,000 |
| 2 | Parsons Brinckerhoff | $146,400,000 |
| 3 | Jacobs Engineering Group | $95,180,000 |
| 4 | Burns & McDonnell | $82,020,000 |
| 5 | Thornton Tomasetti | $50,861,467 |
| 6 | Michael Baker Jr. | $50,720,000 |
| 7 | WSP USA | $48,500,162 |
| 8 | Arup | $32,355,607 |
| 9 | Buro Happold Consulting Engineers | $28,720,000 |
| 10 | AKF Group | $26,917,000 |
| 11 | Allen & Shariff | $23,000,000 |
| 12 | Syska Hennessy Group | $22,537,724 |
| 13 | URS Corp. | $22,004,616 |
| 14 | Environmental Systems Design | $19,528,391 |
| 15 | Science Applications International Corp. | $18,346,871 |
| 16 | Dewberry | $16,371,636 |
| 17 | Wiss, Janney, Elstner Associates | $13,850,000 |
| 18 | GHT Limited | $12,944,469 |
| 19 | Glumac | $12,535,000 |
| 20 | Haynes Whaley Associates | $10,928,961 |
| 21 | Magnusson Klemencic Associates | $10,597,664 |
| 22 | Vanderweil Engineers | $10,485,700 |
| 23 | KPFF Consulting Engineers | $10,000,000 |
| 24 | BRPH | $9,800,000 |
| 25 | RDK Engineers | $9,578,000 |
| 26 | Simpson Gumpertz & Heger | $8,500,000 |
| 27 | Clark Nexsen | $6,169,304 |
| 28 | Rolf Jensen & Associates | $6,000,000 |
| 29 | H.F. Lenz | $5,357,000 |
| 30 | H&A Architects & Engineers | $5,239,486 |
| 31 | Joseph R. Loring & Associates | $5,150,000 |
| 32 | Bridgers & Paxton Consulting Engineers | $4,807,632 |
| 33 | ThermalTech Engineering | $3,800,000 |
| 34 | CJL Engineering | $3,521,065 |
| 35 | Smith Seckman Reid | $3,508,905 |
| 36 | STV | $3,505,000 |
| 37 | SSOE Group | $3,380,239 |
| 38 | Newcomb & Boyd | $3,371,710 |
| 39 | Heapy Engineering | $3,362,333 |
| 40 | Sparling | $3,275,463 |
| 41 | TTG | $3,203,930 |
| 42 | Bala Consulting Engineers | $3,160,000 |
| 43 | Walker Parking Consultants | $3,109,222 |
| 44 | M-E Engineers | $3,100,000 |
| 45 | Henderson Engineers | $3,014,367 |
| 46 | Hixson Architecture, Engineering, Interiors | $3,000,000 |
| 47 | TLC Engineering for Architecture | $2,991,691 |
| 48 | Interface Engineering | $2,962,807 |
| 49 | Coffman Engineers | $2,825,000 |
| 50 | Walter P Moore | $2,681,402 |
| 51 | KLH Engineers | $2,600,000 |
| 52 | KJWW Engineering Consultants | $2,352,444 |
| 53 | Karpinski Engineering | $2,179,216 |
| 54 | Aon Fire Protection Engineering | $2,000,000 |
| 55 | Primera Engineers | $1,998,000 |
| 56 | Affiliated Engineers | $1,968,000 |
| 57 | Dunham Associates | $1,750,000 |
| 58 | Spectrum Engineers | $1,745,854 |
| 59 | Peter Basso Associates | $1,700,000 |
| 60 | GRAEF | $1,572,073 |
| 61 | CTLGroup | $1,500,000 |
| 61 | Middough | $1,500,000 |
| 61 | Paulus, Sokolowski and Sartor | $1,500,000 |
| 64 | Degenkolb Engineers | $1,497,172 |
| 65 | Shive-Hattery | $1,480,615 |
| 66 | Wick Fisher White | $1,462,851 |
| 67 | French & Parrello Associates | $1,400,000 |
| 68 | Brinjac Engineering | $1,199,912 |
| 69 | Zak Companies | $1,151,229 |
| 70 | M/E Engineering | $1,134,350 |
| 71 | KCI Technologies | $1,000,000 |
| 71 | OLA Consulting Engineers | $1,000,000 |
| 73 | Kamm Consulting | $947,456 |
| 74 | Mazzetti | $945,119 |
| 75 | Bergmann Associates | $921,000 |
| 76 | Bard, Rao + Athanas Consulting Engineers | $900,000 |
| 77 | Wallace Engineering | $825,000 |
| 78 | CCRD Partners | $700,000 |
| 79 | Eaton Energy Solutions | $613,024 |
| 80 | GRW | $542,150 |
| 81 | G&W Engineering | $450,000 |
| 82 | P2S Engineering | $383,806 |
| 83 | Davis, Bowen & Friedel | $284,349 |
| 84 | Guernsey | $241,535 |
| 85 | Ross & Baruzzini | $225,000 |
| 86 | RMF Engineering Design | $75,000 |
| 87 | Apogee Consulting Group | $59,000 |
| 88 | Total Building Commissioning | $43,810 |
| 89 | Stanley Consultants | $10,107 |
| 90 | FBA Engineering | $10,000 |
Read the Office Sector Giants article
Read BD+C's full Giants 300 Report
Related Stories
| Aug 31, 2011
Wythe Confectionary renovation in Brooklyn completed
Renovation retains architectural heritage while reflecting a modern urban lifestyle.
| Aug 24, 2011
Deadline Extended: 2012 "Best AEC Firms to Work For” Awards
We’re looking for firms that create truly positive workplaces for their AEC professionals and support staff. In other words, this awards program will recognize those AEC firms that nurture and develop their most valuable asset—their people.
| Aug 23, 2011
Acoustical design education model
Pass this exam and earn 1.0 AIA/CES Discovery learning units. You must go to www.BDCnetwork.com/EnhancedAcousticalDesign to take this exam.
| Aug 19, 2011
Thought Leader: Boyd R. Zoccola, chair and chief elected officer of BOMA International
Boyd R. Zoccola is Chair and Chief Elected Officer of BOMA International. A BOMA member since 1994, he has served on the Executive, Finance, Investment, and Medical/Healthcare Facilities Committees. An Indiana Real Estate Principal Broker and a board member of the Real Estate Round Table, he is Executive Vice President of Hokanson Companies, Inc., of Indianapolis, and has been involved in the development of $600 million worth of real estate. On a volunteer basis, Zoccola was president of Horizon House and a board member of Girls, Inc. He holds a BA in biology from Indiana University.
| Aug 19, 2011
How and why AEC professionals choose flooring systems
Design and construction professionals who completed our flooring survey had strong opinions about their preferred flooring type.
| Aug 19, 2011
Underfloor air distribution, how to get the details right
Our experts provide solid advice on the correct way to design and construct underfloor air distribution systems, to yield significant energy savings.
| Aug 19, 2011
Enhanced acoustical design
Ambient noise levels in some facility types are trending up and becoming a barrier to clear communication between building occupants.
| Jul 22, 2011
The Right Platform for IPD
Workstations for successful integrated project delivery, a white paper by Dell and BD+C.
| Jul 22, 2011
High-performance windows and doors
Learning objectives After reading this article, you should be able to: Understand issues of thermal performance and energy efficiency in relation to window and door systems; describe optimal detailing of the window-wall interface and how it contributes to building performance, sustainability, and occupant well-being; understand how durability contributes to sustainable windows/doors; and list sustainable O&M requirements for window and door systems.
