UK Contractor Certification
Health & Safety Certification
NAS (National Assurance Standard) is an independent, evidence-based UK business certification aligned with ISO/IEC 17021 and the Common Assessment Standard (CAS). Assessors review your actual documents — not a self-declaration form.
Starting from £349/year. Renewable annually. Public register listing included.
What is NAS?
What Is NAS Certification?
NAS — the National Assurance Standard — is an independent business certification for UK organisations. It is not a membership scheme or self-declaration database. Businesses must submit real compliance evidence which is reviewed by independent, qualified assessors.
NAS is structured across four tiers — Basic, Bronze, Silver, and Gold — each requiring progressively broader evidence across governance, compliance, ethics, and operational management.
Health and safety policy and arrangements, risk assessments and method statements, COSHH, CDM duties, training, insurance and subcontractor checks — the SSIP core criteria.
Apply for Basic →Everything in Basic plus legal identity and licences, employers’ liability insurance, data protection, equality, complaints handling, employment terms and right-to-work checks.
Apply for Bronze →Everything in Bronze plus environmental and waste management, quality and corrective action, governance and conflicts of interest, competition law, pensions, working time and subcontractor approval.
Apply for Silver →Everything in Silver plus 13 procurement modules: financial standing, anti-bribery and integrity disclosures, tax status, cyber security, ethical supply chain, sustainability and Building Safety Act readiness.
Apply for Gold →Who Can Apply
Who Can Apply for NAS Certification?
Any UK-registered business can apply, across all sectors and trade types.
The Process
The NAS Assessment Process.
A transparent, 9-step evidence-based certification pathway.
Application & Review
Submit your online application. Our team reviews for completeness and eligibility.
Payment & Evidence
Your portal is activated. Upload your compliance evidence through the secure platform.
Assessor Evaluation
An independent assessor reviews your evidence against NAS criteria. Non-conformities are documented.
Decision Review
A decision manager independently reviews the assessment for impartiality and completeness.
Certification Issued
Your NAS certificate is issued with a unique certificate number.
Public Register
Your business is listed on the NAS public register — searchable by any buyer.
NAS Certification FAQs
What is the difference between certification and accreditation?
Certification means your organisation has been independently assessed against a defined standard and issued a formal certificate. Accreditation is the formal recognition that a certification body itself is competent — typically granted by UKAS. NAS operates as an independent certification body aligned with ISO/IEC 17021, issuing formal certificates based on documented evidence.
Do I need certification to work on construction sites?
There is no legal requirement, but most principal contractors, councils, and housing associations require evidence of compliance before awarding work. NAS certification provides that evidence — independently assessed and publicly verifiable, with real assessor review of your documents.
How much does NAS certification cost?
NAS Basic is £349/year, Bronze is £749/year, Silver is £950/year, and Gold is £1,150/year. Pricing is flat — never scaled by headcount or turnover. Loyalty discounts start at 5% from year 2, rising to 20% by year 5.
How long does certification take?
Most assessments complete within 3-5 working days of evidence submission. The full process from application to certificate typically takes 1-3 weeks. No payment is taken at the application stage.
Nationwide UK Coverage
NAS Certification & Business Accreditation 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.