PSC C1AA: Architect and Engineering – Construction: Office Buildings
C1AA is the product and service code (PSC) federal agencies use for architect and engineering – construction: office buildings, in the arch – eng svcs – construction group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 2
- Spending, FY2025
- $244.6 million
- Share to small businesses, since FY2024
- 21%
Open count as of Oct 11, 2026, 3:01 PM ET.
Open contracts with PSC C1AA, due soonest
- GSA A/E SHORT SELECTION PROCESS FOR CONUS/OCONUS
✦ GSA's Public Buildings Service is collecting qualifications from architect/engineer (A/E) firms for a short selection list used for small design jobs (under $350,000) in the U.S.…
Due in 20 daysOct 31, 2026
- Black Warrior, Tombigbee, Alabama, Coosa Rivers Project Management Office
Due in 25 daysNov 5, 2026
Where C1AA sits in the PSC Manual
- Category: Service
- Group C: Architect/Engineer Services
- Group C1: Arch – Eng SVCS – Construction
- Code C1AA: Architect and Engineering – Construction: Office Buildings
NAICS codes used with PSC C1AA
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with C1AA most often:
| NAICS | Industry | Spent, last 3 years | Open notices |
|---|---|---|---|
| 236220 | Commercial and Institutional Building Construction | $770.6 million | 1 |
| 541310 | Architectural Services | $240.4 million | 1 |
| 541330 | Engineering Services | $152.8 million | — |
| 238220 | Plumbing, Heating, and Air-Conditioning Contractors | $6.2 million | — |
| 561210 | Facilities Support Services | $2.6 million | — |
| 541611 | Administrative Management and General Management Consulting Services | $1.1 million | — |
On open notices right now, the most C1AA work comes from Department of Defense and General Services Administration.
Who buys under PSC C1AA
Agencies with the most contract dollars under C1AA over the last three fiscal years, per USAspending.gov:
| Agency | Obligated |
|---|---|
| Federal Bureau of Investigation | $637.9 million |
| Public Buildings Service | $231.2 million |
| Department of State | $155.5 million |
| Department of the Navy | $35.1 million |
| Department of the Air Force | $34.2 million |
| Department of the Army | $28.2 million |
| Departmental Offices | $16.3 million |
| Department of Veterans Affairs | $10.2 million |
Federal spending under PSC C1AA by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $810.2 million |
| FY2025 | $244.6 million |
| FY2026 (incomplete) | $123.5 million |
Headline figures use FY2025, the last complete year. FY2026 is still incomplete and will rise until about early January 2027 as Defense data arrives: USAspending.gov publishes Defense contracts 90 days after they're signed.
Who wins PSC C1AA contracts
| Company | Obligated, last 3 years |
|---|---|
| Brasfield & Gorrie LLC | $519.9 million |
| BL Harbert International LLC | $185.4 million |
| RME/PCI Joint Venture LLC | $44.5 million |
| Dattner Architects DPC | $30.6 million |
| Trane U.S. Inc. | $27.3 million |
| Page Federal Solutions, LLC | $23.8 million |
| Hellmuth, Obata & Kassabaum, Inc. | $21.9 million |
| Smith-Miller + Hawkinson Architects, LLP | $16.1 million |
| Teya Support Services LLC | $15.7 million |
| Jacobs Government Services Company | $12.8 million |
Linked names have a FedReady profile. Profiles cover small businesses registered on SAM.gov, so large companies are listed without one.
Related PSC codes
- C111 BLDGS & Fac / Admin & SVC BLDGS
- C112 BLDGS & Fac / Airfield, Com & MSL F
- C113 Educational Buildings
- C114 Hospital Buildings
- C115 Industrial Buildings
- C116 Residential Buildings
- C117 Warehouse Buildings
- C118 Research and Development Facilities
- C119 Other Buildings
- C121 Conservation and Development
Frequently asked questions
What is PSC C1AA?
C1AA is the service code in the federal Product and Service Code (PSC) Manual for architect and engineering – construction: office buildings, under C (Architect/Engineer Services) and C1 (Arch – Eng SVCS – Construction). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC C1AA?
Most federal contract dollars under PSC C1AA go with NAICS 236220 (Commercial and Institutional Building Construction), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC C1AA?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. 2 open notices use PSC C1AA right now. FedReady can match new ones to your business and email you, free.