Free Tool
NAICS Code Lookup & Small-Business Size Checker
Find your 6-digit NAICS code and instantly check whether you qualify as a small business under the SBA size standards. Required for federal contracting, set-aside opportunities, and SAM.gov registration.
- 236115Construction
New Single-Family Housing Construction (except For-Sale Builders)
General contractors building new single-family homes for clients (not for resale).
Small-business cap: $45 million in average annual receipts - 236220Construction
Commercial and Institutional Building Construction
General contractors building commercial, industrial, and institutional buildings.
Small-business cap: $45 million in average annual receipts - 237110Construction
Water and Sewer Line and Related Structures Construction
Heavy construction of water mains, sewer lines, and related infrastructure.
Small-business cap: $45 million in average annual receipts - 237310Construction
Highway, Street, and Bridge Construction
Construction of roads, highways, streets, bridges, and tunnels.
Small-business cap: $45 million in average annual receipts - 238210Construction
Electrical Contractors and Other Wiring Installation Contractors
Specialty trade contractors for electrical work and wiring installation.
Small-business cap: $19 million in average annual receipts - 238220Construction
Plumbing, Heating, and Air-Conditioning Contractors
Specialty trade contractors for plumbing, HVAC, and refrigeration systems.
Small-business cap: $19 million in average annual receipts - 238910Construction
Site Preparation Contractors
Excavation, demolition, and site preparation services.
Small-business cap: $19 million in average annual receipts - 513210Information
Software Publishers
Companies that develop and publish software products (SaaS, packaged software).
Small-business cap: $47 million in average annual receipts - 517111Information
Wired Telecommunications Carriers
Wired telecom services including landline, fiber, and broadband.
Small-business cap: 1,500 employees - 518210Information
Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services
Data centers, cloud hosting, web hosting, data processing services.
Small-business cap: $40 million in average annual receipts - 519290Information
Web Search Portals and All Other Information Services
Internet publishers, web portals, search engines, and related information services.
Small-business cap: 1,000 employees - 541110Professional, Scientific and Technical Services
Offices of Lawyers
Legal services provided by attorneys and law firms.
Small-business cap: $15.5 million in average annual receipts - 541211Professional, Scientific and Technical Services
Offices of Certified Public Accountants
CPA firms and certified public accounting services.
Small-business cap: $26.5 million in average annual receipts - 541310Professional, Scientific and Technical Services
Architectural Services
Planning and designing buildings and other structures.
Small-business cap: $12.5 million in average annual receipts - 541330Professional, Scientific and Technical Services
Engineering Services
Engineering services, including design, analysis, and consulting.
Small-business cap: $25.5 million in average annual receipts - 541370Professional, Scientific and Technical Services
Surveying and Mapping (except Geophysical) Services
Land surveying, mapping, geographic information systems (GIS).
Small-business cap: $19 million in average annual receipts - 541511Professional, Scientific and Technical Services
Custom Computer Programming Services
Custom software development, application development, programming services.
Small-business cap: $34 million in average annual receipts - 541512Professional, Scientific and Technical Services
Computer Systems Design Services
Designing and integrating computer systems for clients (often the most-used IT NAICS for federal contracts).
Small-business cap: $34 million in average annual receipts - 541513Professional, Scientific and Technical Services
Computer Facilities Management Services
On-site management and operation of clients' computer systems and data centers.
Small-business cap: $37 million in average annual receipts - 541519Professional, Scientific and Technical Services
Other Computer Related Services
Computer services not classified elsewhere — disaster recovery, computer forensics, etc.
Small-business cap: $34 million in average annual receipts - 541611Professional, Scientific and Technical Services
Administrative Management and General Management Consulting Services
Management consulting on operations, strategy, and administration.
Small-business cap: $24.5 million in average annual receipts - 541612Professional, Scientific and Technical Services
Human Resources Consulting Services
Consulting on HR strategy, compensation, training, and organizational design.
Small-business cap: $29 million in average annual receipts - 541613Professional, Scientific and Technical Services
Marketing Consulting Services
Consulting on marketing strategy, branding, and market research.
Small-business cap: $19 million in average annual receipts - 541614Professional, Scientific and Technical Services
Process, Physical Distribution, and Logistics Consulting Services
Consulting on supply chain, logistics, and operational processes.
Small-business cap: $20 million in average annual receipts - 541618Professional, Scientific and Technical Services
Other Management Consulting Services
Management consulting not classified elsewhere — including telecom, IT advisory, etc.
Small-business cap: $19 million in average annual receipts - 541620Professional, Scientific and Technical Services
Environmental Consulting Services
Environmental impact assessment, remediation planning, and compliance consulting.
Small-business cap: $19 million in average annual receipts - 541690Professional, Scientific and Technical Services
Other Scientific and Technical Consulting Services
Scientific and technical consulting not classified elsewhere — energy, agriculture, etc.
Small-business cap: $19 million in average annual receipts - 541715Professional, Scientific and Technical Services
Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)
R&D in physical sciences, engineering, and life sciences — common for SBIR/STTR contracts.
Small-business cap: 1,000 employees - 541810Professional, Scientific and Technical Services
Advertising Agencies
Full-service advertising agencies creating campaigns across media.
Small-business cap: $25.5 million in average annual receipts - 541820Professional, Scientific and Technical Services
Public Relations Agencies
PR services, media relations, crisis communications.
Small-business cap: $19 million in average annual receipts
What is a NAICS code?
The North American Industry Classification System (NAICS) is the standard used by federal agencies to classify business establishments. Every government solicitation lists a primary NAICS code so vendors can quickly identify which contracts they’re eligible to bid on.
Why size standards matter
The SBA sets a maximum revenue, asset, or employee count for each NAICS code. If your company is below that cap, you qualify for small-business set-aside contracts and certifications like 8(a), HUBZone, WOSB, and SDVOSB.
How to use this tool
Search by industry keyword, business activity, or 6-digit code. Click any result to see the full SBA size standard, run an eligibility check, and get next steps for SAM.gov registration and certification.
Found your NAICS — now what?
Knowing your code is step one. SLED.AI handles SAM.gov registration, set-aside certification strategy, opportunity matching, and proposal writing — the rest of the path from zero to your first government contract.
Related guides
- Complete guide to government contracting for small businessPillar guide — everything from registration to first win.
- Small business certifications: 8(a), HUBZone, WOSB, SDVOSBWhich certifications match your NAICS and eligibility.
- Easiest government contracts to winAccessible entry points once your NAICS is set.
- Selling to state and local government (SLED)Where your NAICS code intersects with the SLED market.
Data version 2023-03-17-sba-full. Covers 978 six-digit NAICS codes with SBA size standards from the table effective March 17, 2023. For an authoritative check before submitting a bid, verify against the current SBA Table of Size Standards and the Census NAICS taxonomy.