Rank Company 2012 Total Revenue ($) 1 Fluor $221,231,200 2 Arup $149,738,587 3 Affiliated Engineers $105,503,000 4 WSP USA $105,362,352 5 KPFF Consulting Engineers $91,000,000 6 Syska Hennessy Group $82,097,502 7 Henderson Engineers $63,485,775 8 Smith Seckman Reid $52,919,312 9 KJWW Engineering Consultants $51,092,154 10 Vanderweil Engineers $50,552,200 11 TTG $49,968,167 12 Glumac $47,967,000 13 Bard, Rao + Athanas Consulting Engineers $41,500,000 14 Rolf Jensen & Associates $40,000,000 15 Coffman Engineers $39,100,000 16 Environmental Systems Design $38,763,000 17 Magnusson Klemencic Associates $37,462,767 18 M-E Engineers $35,400,000 19 TLC Engineering for Architecture $34,295,957 20 RMF Engineering Design $32,300,000 21 RDK Engineers $31,201,000 22 Walter P Moore $29,092,693 23 H.F. Lenz $26,991,500 24 Interface Engineering $25,193,936 25 Degenkolb Engineers $25,127,432 26 CCRD Partners 25,100,000 27 Mazzetti 24,895,804 28 Robins & Morton 24,500,000 29 M/E Engineering 22,687,000 30 Aon Fire Protection Engineering 22,510,728 31 Heapy Engineering 22,116,941 32 Sparling 20,282,073 33 Haynes Whaley Associates 19,907,949 34 Newcomb & Boyd 18,617,195 35 KCI Technologies 18,032,000 36 Bridgers & Paxton Consulting Engineers 16,868,884 37 GHT Limited 16,834,469 38 Bala Consulting Engineers 16,430,000 39 French & Parrello Associates 15,903,300 40 ThermalTech Engineering 15,500,000 41 Joseph R. Loring & Associates 15,000,000 42 KLH Engineers 14,072,830 43 Dunham Associates 14,000,000 44 Wallace Engineering 13,350,000 45 P2S Engineering 12,962,044 46 Karpinski Engineering 12,076,943 47 Peter Basso Associates 11,016,000 48 Rist-Frost-Shumway Engineering 9,300,000 49 CTLGroup 9,000,000 50 Allen & Shariff 8,500,000 51 Wick Fisher White 8,126,951 52 Brinjac Engineering 6,890,645 53 OLA Consulting Engineers 5,500,000 54 Eaton Energy Solutions 4,430,095 55 Kamm Consulting 3,681,775 56 FBA Engineering 3,360,000 57 Apogee Consulting Group 3,331,300 58 G&W Engineering 2,408,800 59 Total Building Commissioning 616,878 60 Yates Cos., The 400,000 61 Weis Builders 300,000