NAS Certified Business Register.
The NAS public register of certified UK businesses. Every entry has been independently assessed — not self-declared.
Free to search for buyers, procurement teams, and main contractors.
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About This Register
About This Register.
This register lists all businesses that currently hold valid NAS (National Assurance Standard) certification. All entries have been independently assessed by a qualified assessor — certification is not self-declared.
Buyers and procurement teams can use this register to verify supplier credentials at no cost. NAS certification is independently assessed and aligned with ISO/IEC 17021 principles.
If you believe any information is incorrect, contact us at [email protected]
Want to Be Listed?
Apply for NAS certification and join the register. Basic from £349/year.
How the certification process works →Nationwide UK Coverage
Find NAS Certified Businesses Across the UK
NAS — the National Assurance Standard — provides independent, evidence-based contractor certification for trades, contractors and SMEs in every town, city and region across the United Kingdom. From sole traders to main contractors, NAS certification helps businesses prove compliance, appear on approved supplier lists, and win work with verified credentials.
Accreditation & certification support in:
Serving businesses across England, Scotland, Wales, Northern Ireland, Greater London, the Midlands, the North West, the North East, Yorkshire, the South West, the South East, East Anglia — and every town in between.