What is NAS Certification?

NAS (National Assurance Standard) is an independent, evidence-based UK accreditation and certification for contractors, tradespeople, and SMEs. It is aligned with ISO/IEC 17021 and assessed by qualified, independent assessors.

How much does NAS Certification cost?

NAS Basic costs £349/year, NAS Bronze costs £749/year, NAS Silver costs £950/year, and NAS Gold costs £1,150/year. Loyalty renewal discounts apply from year 2.

Is NAS Certification the same as CHAS?

No. NAS Certification is independent of CHAS. Unlike CHAS, NAS uses real assessor review of actual evidence documents — not self-declaration — and is aligned with ISO/IEC 17021.

How long does NAS Certification take?

Most NAS assessments are completed within 3-5 working days of submitting your evidence. The full process from application to certificate typically takes 1-3 weeks.

Drain Clearance NAS | NAS National Assurance Standard

Drain Clearance NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.

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NAS — National Assurance Standard | UK Accreditation & Contractor Certification

UK Accreditation & Certification for Contractors. Business Support & Growth Nationwide.

NAS (National Assurance Standard) is an independent, evidence-based UK accreditation and certification scheme for contractors, trades and SMEs in every town and city across the UK. Contractors prove their compliance, manage key documents and share live supplier data with buyers. Procurement teams get a clearer view of certification status, insurance, workforce records, RAMS, CIS information and contractor risk — without chasing endless emails.

Independent assessment. Evidence-based certification. ISO/IEC 17021 aligned.

Apply for NAS Certification → | Request Buyer Access →

Stop Paying for a Badge. Start Building Proof.

For Contractors

Get NAS certified, build credibility, manage compliance documents, create RAMS, track workforce records and win more work. Show buyers live compliance evidence, reduce repeated document requests, and grow your business with procurement-ready accreditation.

For Buyers & Procurement

Stop chasing supplier paperwork. NAS gives procurement, HSEQ and supply chain teams a live view of contractor compliance, certification status, insurance, workforce training, policies, RAMS, CIS records and financial health indicators.

Request free buyer access →

NAS Certification Tiers

NAS Basic — £349/year

Entry-level H&S accreditation for sole traders and small businesses. Covers Health & Safety Policy, RAMS assessment, digital NAS certificate and public register listing.

Apply for Basic

NAS Bronze — £749/year

Full compliance certification for SMEs & contractors covering core legislation and operational compliance. Includes Data Protection, GDPR, Equality & Diversity, and insurance verification.

Apply for Bronze

NAS Silver — £950/year

Enhanced compliance for growing SMEs with governance, environmental policy, risk management evidence and operational maturity. Priority processing included.

Apply for Silver

NAS Gold — £1,150/year

Procurement-ready certification covering 22 compliance areas including Building Safety Act, corporate governance, PQQ response generator and shareable buyer profile.

Apply for Gold

Built Around Impartial Assessment

Evidence-based assessment — no self-declaration
Independent assessor review
Certification decision separation
Full audit trail
Complaints and appeals process
Public certificate verification
Public register of certified businesses
Aligned with ISO/IEC 17021 principles

Who Is NAS Certification For?

NAS accreditation is for UK contractors, subcontractors, tradespeople, and SMEs who want to demonstrate live compliance, win more contracts, and get onto approved supplier lists — supporting business growth in every region of the UK.

Recognised by housing associations, main contractors, local councils, NHS trusts, MOD suppliers, and procurement teams across the UK.

How NAS Certification Works

Submit your online NAS application at nrta.uk
Upload your compliance evidence to the secure NAS portal
An independent assessor reviews your evidence against the National Assurance Standard
Receive a decision — approval, corrections required, or NCR raised
Certificate issued and your business listed on the NAS Certified Business Register

Full guide to how NAS certification works →

Compare NAS to Other UK Compliance Schemes

NAS vs CHAS
CHAS Alternative UK
SafeContractor cost comparison
Constructionline vs NAS Certification
SMAS vs CHAS