NAS is suitable for contractors, suppliers, consultants and service providers across the UK built environment, property, maintenance, infrastructure and public sector supply chain.
It is not a tick-box membership. An assessor reviews your actual documents — policies, risk assessments, insurance, training records — before a separate person decides whether to certify.
Built for Buyers Who Need More Than a Self-Declaration
NAS gives buyers independent evidence about the businesses in their supply chain. Every certificate is backed by documents an assessor has reviewed, renewed each year, and checkable on the free NAS register.
This helps procurement, compliance, health and safety, contract managers and site teams make better-informed decisions before and during works.
Public Register
Check any certificate free by name or number.
Verified Documents
Assessor-reviewed policies, insurance and evidence.
Training Evidence
Workforce training records reviewed at assessment.
Annual Re-Assessment
A fresh evidence review every year at renewal.
- ✓Show buyers a certificate backed by documents an assessor has reviewed
- ✓Show your workforce cards, training records and RAMS in one place
- ✓Reduce repeated document requests from clients and main contractors
- ✓Build a verified, professional buyer-facing profile
- ✓Stand out in tender responses and pre-qualification questionnaires
- ✓Demonstrate your commitment to standards independently assessed
Built for Contractors Who Want to Be Taken Seriously
For contractors, NAS helps turn compliance evidence into a professional buyer-facing profile. Businesses can show what they do, where they work, what documents they hold, what training their workforce has completed and how they manage compliance across their organisation.
It gives good businesses a better way to evidence their standards instead of being buried in paperwork, repeated email requests and outdated certificate checks.
Certification by Sector
NAS certification supports contractor compliance, buyer assurance and supply chain confidence across every major sector.
Housing Associations
Independently checked contractor compliance for planned maintenance, repairs and new build supply chains.
Find out moreLocal Authorities
Evidence-based certification helping councils meet procurement and due diligence obligations.
Find out moreHouse Builders
Subcontractor and supply chain compliance certification on residential developments.
Find out moreMain Contractors
Tier 1 and principal contractor supply chain assurance through verified NAS profiles.
Find out moreFacilities Management
FM contractors and hard and soft services providers with independent compliance credentials.
Find out moreNHS & Healthcare
Compliance certification for contractors working in NHS estates and healthcare environments.
Find out moreMOD & Defence
Supply chain certification for contractors operating on defence and government estates.
Find out moreRail & Transport
NAS certification for rail contractors, infrastructure suppliers and trackside service providers.
Find out moreUtilities & Infrastructure
Compliance evidence for contractors delivering utility and civil infrastructure projects.
Find out moreEducation & Schools
Contractor certification for education estate works, maintenance and capital projects.
Find out moreCommercial Property
Compliance and workforce certification for commercial fit-out and maintenance contractors.
Find out moreRetail & Leisure
Supply chain assurance for contractors working across retail, hospitality and leisure estates.
Find out moreSocial Housing
Registered provider supply chain compliance and contractor onboarding assurance.
Find out moreIndustrial & Manufacturing
Certification for contractors working in industrial, manufacturing and process environments.
Find out moreInsurance Repair Networks
Compliance and competence certification for contractors within insurance repair panels.
Find out morePublic Sector Procurement
Supporting public sector buyers with structured contractor due diligence and assurance.
Find out moreCertification by Trade
NAS certification is available to all UK trade businesses. Find your trade and understand how to evidence your standards.