What's the NAICS and SIC code for an architecture firm?
For an architecture firm, use NAICS 541310 (Architectural Services) in the US and SIC 71111 (Architectural activities) in the UK.
United States, NAICS 2022
541310 Architectural Services
Architectural Services (except landscape).
SBA small business limit: $12.5 million average annual receipts.
United Kingdom, SIC 2007
71111 Architectural activities
Architectural activities.
Use this code when you register with Companies House or file your confirmation statement.
When a different code fits better
These are the codes most often confused with the main answer. Pick by the activity that earns most of your revenue.
| Code | Title | Use it if |
|---|---|---|
| NAICS 541320 | Landscape Architectural Services | you design landscapes |
| NAICS 541340 | Drafting Services | you mainly provide drafting |
| SIC 71112 | Urban planning and landscape architectural activities | you do urban planning or landscape architecture |
Good to know
Engineering firms have separate codes from architecture firms.
You can list more than one code. Companies House accepts up to four SIC codes, and SAM.gov lets you add several NAICS codes, with one marked as primary.
What the code affects
- SBA programs and federal contracts: your NAICS code sets the size limit you must stay under to count as small. Check your size.
- SAM.gov registration: contracting officers search by NAICS, so list every code you can deliver work under.
- Companies House: your SIC code appears on the public register and in your confirmation statement.
Related business types
Codes checked against the US Census 2022 NAICS index and the ONS UK SIC 2007 index. Information only; confirm with the agency you file with.