With the green building movement now in its second decade, Giants 300 firms have made sustainability comparable to breathing. They do it automatically.
New this year: charts showing the total number of green accredited staff—in addition to LEED APs and LEED Green Associates, the total includes Certified Energy Auditors and Managers, Certified Sustainable Building Advisors, Green Advantage Certified Professionals, Green Globes Assessors and Professionals, Green Roof Professionals, and High-Performance Building Design Professionals.
Note: An AEC professional who is, for example, both a LEED AP and a CEM would be counted in both categories.
Below, you’ll find rankings of green accredited professionals as a percentage of total employees in the firm. We did this to recognize smaller firms that have a high percentage of green-certified staff. +
TOP 10 GREEN BUILDING ARCHITECTURE FIRMS
| Rank | Company | 2011 Green Revenue ($) |
| 1 | Gensler | 392,000,000 |
| 2 | Skidmore, Owings & Merrill | 165,750,000 |
| 3 | HOK | 164,680,868 |
| 4 | HDR Architecture | 137,120,000 |
| 5 | Perkins+Will | 131,350,000 |
| 6 | HKS | 119,325,668 |
| 7 | NBBJ | 106,167,000 |
| 8 | ZGF Architects | 75,600,000 |
| 9 | HNTB Architecture | 62,139,956 |
| 10 | RTKL Associates | 60,000,000 |
TOP 10 GREEN BUILDING ENGINEERING FIRMS
| Rank | Company | 2011 Green Revenue ($) |
| 1 | Stantec | 189,400,000 |
| 2 | URS Corp. | 137,048,000 |
| 3 | AECOM Technology Corp. | 118,000,000 |
| 4 | Jacobs | 102,496,836 |
| 5 | Arup | 60,960,000 |
| 6 | KPFF Consulting Engineers | 50,000,000 |
| 7 | Burns & McDonnell | 43,747,479 |
| 8 | Syska Hennessy Group | 43,150,000 |
| 9 | WSP USA | 34,500,000 |
| 10 | Parsons Brinckerhoff | 34,400,000 |
TOP 10 GREEN BUILDING CONSTRUCTION FIRMS
| Rank | Company | 2011 Green Revenue ($) |
| 1 | Turner Corporation, The | 4,540,280,000 |
| 2 | URS Corp. | 3,875,000,000 |
| 3 | Clark Group | 2,324,000,000 |
| 4 | Balfour Beatty US | 2,137,850,000 |
| 5 | Gilbane Building Co. | 2,085,018,000 |
| 6 | Whiting-Turner Contracting Co., The | 1,911,396,378 |
| 7 | PCL Construction Enterprises | 1,730,300,000 |
| 8 | Hensel Phelps Construction | 1,476,940,000 |
| 9 | Holder Construction | 1,061,000,000 |
| 10 | Barton Malow Co. | 1,005,440,388 |
TOP 10 GREEN ACCREDITED STAFF AT ARCHITECTURE FIRMS
| Rank | Company | 2011 Green Accredited Staff |
| 1 | Gensler | 1211 |
| 2 | Perkins+Will | 986 |
| 3 | HOK | 854 |
| 4 | HDR Architecture | 802 |
| 5 | Cannon Design | 397 |
| 6 | SmithGroupJJR | 367 |
| 7 | HKS, Inc. | 342 |
| 8 | IBI Group | 313 |
| 9 | RTKL Associates | 242 |
| 10 | Skidmore, Owings & Merrill | 235 |
TOP 10 GREEN ACCREDITED STAFF AT ENGINEERING FIRMS
| Rank | Company | 2011 Green Accredited Staff |
| 1 | AECOM Technology Corp. | 914 |
| 2 | Stantec | 664 |
| 3 | Jacobs | 559 |
| 4 | URS Corp. | 501 |
| 5 | Burns & McDonnell | 272 |
| 6 | Arup | 233 |
| 7 | Parsons Brinckerhoff | 223 |
| 8 | WSP USA | 200 |
| 9 | Clark Nexsen | 191 |
| 10 | Dewberry | 178 |
TOP 10 GREEN ACCREDITED STAFF AT CONSTRUCTION FIRMS
| Rank | Company | 2011 Green Accredited Staff |
| 1 | Turner Corporation, The | 1251 |
| 2 | Jones Lang LaSalle | 1250 |
| 3 | Gilbane Building Co. | 481 |
| 4 | Balfour Beatty US | 446 |
| 5 | McCarthy Holdings | 407 |
| 6 | DPR Construction | 399 |
| 7 | JE Dunn Construction | 390 |
| 8 | Clark Group | 355 |
| 9 | PCL Construction Enterprises | 336 |
| 10 | Hensel Phelps Construction | 325 |
Related Stories
Warehouses | Mar 29, 2023
Construction completed on Canada’s first multi-story distribution center
Construction was recently completed on Canada’s first major multi-story industrial project, a distribution center in Burnaby, British Columbia. The project provides infrastructure for last-mile delivery in a world where consumers have come to expect next-day and same-day delivery, according to Ware Malcomb, the project's architect of record.
AEC Innovators | Mar 27, 2023
Leading architecture, engineering firm HED appoints new co-CEOs
As children of immigrant families, Van Herle and Suarez will bring a diverse perspective into a historically underrepresented industry and advance the firm’s mission of creating a positive impact for clients, communities, and the world.
Healthcare Facilities | Mar 26, 2023
UC Davis Health opens new eye institute building for eye care, research, and training
UC Davis Health recently marked the opening of the new Ernest E. Tschannen Eye Institute Building and the expansion of the Ambulatory Care Center (ACC). Located in Sacramento, Calif., the Eye Center provides eye care, vision research, and training for specialists and investigators. With the new building, the Eye Center’s vision scientists can increase capacity for clinical trials by 50%.
Libraries | Mar 26, 2023
An abandoned T.J. Maxx is transformed into a new public library in Cincinnati
What was once an abandoned T.J. Maxx store in a shopping center is now a vibrant, inviting public library. The Cincinnati & Hamilton County Public Library (CHPL) has transformed the ghost store into the new Deer Park Library, designed by GBBN.
Multifamily Housing | Mar 24, 2023
Multifamily developers offering new car-free projects in car-centric cities
Cities in the South and Southwest have eased zoning rules with parking space mandates in recent years to allow developers to build new housing with less parking.
Multifamily Housing | Mar 24, 2023
Coastal multifamily developers, owners expect huge jump in insurance costs
In Texas and Florida, where Hurricane Ian caused $50 billion in damage last year, insurance costs are nearly 50% higher than in 2022.
Multifamily Housing | Mar 24, 2023
Average size of new apartments dropped sharply in 2022
The average size of new apartments in 2022 dropped sharply in 2022, as tracked by RentCafe. Across the U.S., the average new apartment size was 887 sf, down 30 sf from 2021, which was the largest year-over-year decrease.
Government Buildings | Mar 24, 2023
19 federal buildings named GSA Design Awards winners
After a six-year hiatus, the U.S. General Services Administration late last year resumed its esteemed GSA Design Awards program. In all, 19 federal building projects nationwide were honored with 2022 GSA Design Awards, eight with Honor Awards and 11 with Citations.
Transportation & Parking Facilities | Mar 23, 2023
Amsterdam debuts underwater bicycle parking facility that can accommodate over 4,000 bikes
In February, Amsterdam saw the opening of a new underwater bicycle parking facility. Located in the heart of the city—next to Amsterdam Central Station and under the river IJ (Amsterdam’s waterfront)—the facility, dubbed IJboulevard, has parking spots for over 4,000 bicycles, freeing up space on the street.
Healthcare Facilities | Mar 22, 2023
New Jersey’s new surgical tower features state’s first intraoperative MRI system
Hackensack (N.J.) University Medical Center recently opened its 530,000-sf Helena Theurer Pavilion, a nine-story surgical and intensive care tower designed by RSC Architects and Page. The county’s first hospital, Hackensack University Medical Center, a 781-bed nonprofit teaching and research hospital, was founded in 1888.
