What is NAS?
The NRTAUK Assurance Standard (NAS) is an independent compliance and accreditation framework that helps UK businesses prove their commitment to high industry standards.
Developed on the CORE Framework (Compliance, Operations, Risk & Ethics), NAS ensures your business is aligned with Health & Safety Executive (HSE) requirements and the Common Assessment Standard (CAS).
By achieving NAS certification, you demonstrate that your organisation not only meets — but exceeds — essential operational, legal, and ethical obligations.
Build Credibility
Trusted by clients, contractors & procurement teams
Win More Work
Essential for tenders and supply-chain contracts
Stay Compliant
Aligned with UK law and industry standards
Join the Network
Connect with thousands of accredited businesses
Choose Your NAS Tier
Select the level that matches your business needs
The NAS Certification Process
Apply
Submit your application with required evidence
Assessment
Independent assessor reviews your submission
NCR Resolution
Address any non-conformities identified
Decision
Independent decision maker approves
Certified
Receive your NAS certificate