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 certification to work on construction sites in the UK?

There is no legal requirement to hold a specific certification. 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.

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.

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Raise NCR — Raise NCR on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Register — Register on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Supplier Directory — Supplier Directory on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Contractors Page — Contractors Page on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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NAS For Contractors — NAS For Contractors on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
NAS For Procurement — NAS For Procurement on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Sectors Hub — Sectors Hub on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Housing Associations — Housing Associations on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
House Builders — House Builders on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Facilities Maintenance — Facilities Maintenance on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Main Contractors — Main Contractors on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Hospitals NHS — Hospitals NHS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
MOD Defence — MOD Defence on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Plumbers NAS — Plumbers NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Electricians NAS — Electricians NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Roofers NAS — Roofers NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Bricklayers NAS — Bricklayers NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Carpenters NAS — Carpenters NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Decorators NAS — Decorators NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Drain Clearance NAS — Drain Clearance NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Fitters NAS — Fitters NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Cleaners NAS — Cleaners NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Other Trades NAS — Other Trades NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Contractor Compliance Score — Contractor Compliance Score on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
How Our Compliance Scan Works — How Our Compliance Scan Works on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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NA Svs CHAS Comparison — NA Svs CHAS Comparison on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CHAS Alternative UK — CHAS Alternative UK on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
SMA Svs CHAS Difference — SMA Svs CHAS Difference on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Constructionline Vs Certification — Constructionline Vs Certification on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Constructionline Requirements Checker — Constructionline Requirements Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Local Authorities NAS — Local Authorities NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Education Schools NAS — Education Schools NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Commercial Property NAS — Commercial Property NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Retail Leisure NAS — Retail Leisure NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Social Housing NAS — Social Housing NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Industrial Manufacturing NAS — Industrial Manufacturing NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Insurance Repair NAS — Insurance Repair NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Public Sector NAS — Public Sector NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Gas NAS — Gas NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Plastering Dry Lining NAS — Plastering Dry Lining NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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Fire Safety NAS — Fire Safety NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.

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NAS — National Assurance Standard | UK Contractor Certification

UK Certification for Contractors. Business Support & Growth Nationwide.

NAS (National Assurance Standard) is an independent, evidence-based UK 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 certification.

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 certification 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 certification 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 →