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 to carry out assessments — typically granted by a national body like UKAS. NAS operates as an independent certification body aligned with ISO/IEC 17021 principles, assessing organisations and issuing formal certificates based on documented evidence.

Do I need accreditation to work on construction sites in the UK?

There is no legal requirement to hold a specific accreditation. However, most principal contractors, housing associations, councils, and NHS trusts require evidence of compliance before awarding work. NAS certification provides that evidence — independently assessed and publicly verifiable, with real assessor review of your actual documents.

Is SSIP accreditation a legal requirement?

No. There is no law requiring an SSIP assessment. However, many clients require it for prequalification. NAS provides an independent, evidence-based alternative that goes beyond basic SSIP self-declaration — with qualified assessor review and a publicly searchable certificate register that buyers trust.

Is NAS certification the same as CHAS?

No. CHAS operates as a membership and prequalification scheme with a self-declaration model. NAS operates as an independent certification body aligned with ISO/IEC 17021 — real assessors review your actual evidence, a separate decision manager confirms objectivity, and a formal certificate is issued. NAS Gold is also aligned with the Common Assessment Standard (CAS).

How much does NAS certification cost?

NAS Basic is £349/year, NAS Bronze is £749/year, NAS Silver is £950/year, and NAS Gold is £1,150/year. Pricing is flat — never scaled by headcount or turnover. Loyalty discounts apply from year 2 (5% rising to 20% by year 5).

How long does NAS certification take?

Most NAS assessments complete within 3-5 working days of evidence submission. The full process from application to certificate typically takes 1-3 weeks.

What is ISO 17021 and why does it matter?

ISO/IEC 17021 is the international standard governing bodies that certify management systems. It requires independent assessors, separation of assessment and decision-making, and evidence-based decisions. NAS operates its certification scheme in alignment with these principles.

How long is NAS certification valid?

NAS certification is valid for one year and is renewed annually. The annual renewal cycle ensures your compliance is kept current. Loyalty discounts apply from year 2.

NASvs CHASComparison | NAS National Assurance Standard

NASvs CHASComparison on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.

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Bsr / BSR Contractors — bsr/BSRContractors on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Property Import — bsr/BSRProperty Import on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / Building Safety Demo — bsr/Building Safety Demo on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Bsr / BSR Demo Portal — bsr/BSRDemo Portal on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / Building Safety Checkout — bsr/Building Safety Checkout on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / Building Safety Register Home — bsr/Building Safety Register Home on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Bsr / BSR Guide — bsr/BSRGuide on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Enterprise Enquiry — bsr/BSREnterprise Enquiry on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Settings — bsr/BSRSettings on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Trade Link — bsr/BSRTrade Link on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / Building Safety Pricing — bsr/Building Safety Pricing on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Golden Thread — bsr/BSRGolden Thread on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Portal — bsr/BSRPortal on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Competent Register — bsr/BSRCompetent Register on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Properties — bsr/BSRProperties on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Dashboard — bsr/BSRDashboard on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bsr / BSR Compliance — bsr/BSRCompliance on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Contractor Certification Pricing — seo/Contractor Certification Pricing on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / For Buyers — seo/For Buyers on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Supplier Compliance Verification — seo/Supplier Compliance Verification on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Seo / Approved Contractor Register — seo/Approved Contractor Register on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Contractor Compliance Certification — seo/Contractor Compliance Certification on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Live Contractor Compliance — seo/Live Contractor Compliance on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Knowledge Centre — seo/Knowledge Centre on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Contractor Certification UK — seo/Contractor Certification UK on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Evidence Based Certification — seo/Evidence Based Certification on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Procurement Ready Contractors — seo/Procurement Ready Contractors on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Trade / Contractor Certification Property Maintenance — seo/trade/Contractor Certification Property Maintenance on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Trade / Contractor Certification Roofers — seo/trade/Contractor Certification Roofers on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Trade / Contractor Certification FM — seo/trade/Contractor Certification FM on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Trade / Contractor Certification Fire Safety — seo/trade/Contractor Certification Fire Safety on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Seo / Trade / Contractor Certification Electricians — seo/trade/Contractor Certification Electricians on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Seo / Sector / Certification For Housing Associations — seo/sector/Certification For Housing Associations on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Sector / Certification For Main Contractors — seo/sector/Certification For Main Contractors on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Seo / Sector / Certification For Councils — seo/sector/Certification For Councils 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 nas-certification.co.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 →