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.

ISO Clause Admin | NAS National Assurance Standard

ISO Clause Admin on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.

Pages

Public Home
About — About on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
About NAS — About NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Account Settings — Account Settings on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Accreditation Audit Log — Accreditation Audit Log on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Accreditation Backoffice — Accreditation Backoffice on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Accredited Register — Accredited Register on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Admin User Management — Admin User Management on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Application Detail — Application Detail on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Application Form — Application Form on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Assess Application — Assess Application on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Assessment Decisions — Assessment Decisions on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Assessor Dashboard — Assessor Dashboard on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Assessor Guide — Assessor Guide on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Assessor Management Gov — Assessor Management Gov on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Assessor Manager — Assessor Manager on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Audit Log — Audit Log on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Basic Application — Basic Application on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Blog — Blog on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Blog Manager — Blog Manager on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Blog Post — Blog Post on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Business Record Detail — Business Record Detail on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Business Settings — Business Settings on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CAPA Details — CAPA Details on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CAPA Register — CAPA Register on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CCS Admin — CCS Admin on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CCS Admin Review — CCS Admin Review on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CCS Admin Rules — CCS Admin Rules on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CCS Admin Scans — CCS Admin Scans on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CORE Info — CORE Info on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CORE Training — CORE Training on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
COSHH Checker — COSHH Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CRM Calendar — CRM Calendar on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CRM Dashboard — CRM Dashboard on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CRM Opportunities — CRM Opportunities on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CRM Organisation Detail — CRM Organisation Detail on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CRM Organisations — CRM Organisations on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CRM Tasks — CRM Tasks on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Certificate Builder — Certificate Builder on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Certified Business Records — Certified Business Records on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Chat Insights — Chat Insights on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Check My Role — Check My Role on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Choose Payment Plan — Choose Payment Plan on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Client Hunter — Client Hunter on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Company Detail — Company Detail on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Complaint Communication — Complaint Communication on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Complaint Outcome — Complaint Outcome on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Complaint Review — Complaint Review on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Complaints Dashboard — Complaints Dashboard on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Complaints Register — Complaints Register on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Compliance Hub Admin — Compliance Hub Admin on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Compliance Hub Dashboard — Compliance Hub Dashboard on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Compliance Vault — Compliance Vault on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Contact — Contact on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Contact NAS — Contact NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Contractor Insurance Checker — Contractor Insurance Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Course Certificate Designer — Course Certificate Designer on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Course Content Manager — Course Content Manager on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Course Detail — Course Detail on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Course Module — Course Module on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Create CAPA — Create CAPA on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Create Sales Cycle — Create Sales Cycle on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Document Management — Document Management on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Downloads — Downloads on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Edit Course — Edit Course on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Expiry Monitoring — Expiry Monitoring on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
FAQ Page — FAQ Page on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Forum — Forum on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Forum Category — Forum Category on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Forum Thread — Forum Thread on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Generate Sales Pack — Generate Sales Pack on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Gold Application — Gold Application on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Governance Impartiality — Governance Impartiality on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Governance Overview — Governance Overview on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Health Safety Policy Checker — Health Safety Policy Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Home — Home on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
How Accreditation Works — How Accreditation Works on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
ISO Library — ISO Library on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
ISO Requirement Admin — ISO Requirement Admin on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Impartiality Safeguards — Impartiality Safeguards on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Invite User — Invite User on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Job Details — Job Details on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Jobs — Jobs on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Log New Complaint — Log New Complaint on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Member Dashboard — Member Dashboard on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Member Directory — Member Directory on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Member Profile — Member Profile on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Member Profile View — Member Profile View on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Messages — Messages on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
My Accreditation — My Accreditation on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
My Saved Tenders — My Saved Tenders on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
My Saved Tenders Enhanced — My Saved Tenders Enhanced on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
My Supplier Profile — My Supplier Profile on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
My Tender Applications — My Tender Applications on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
NAS Application Detail — NAS Application Detail on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
NAS Assessment Case — NAS Assessment Case on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
NAS Certification Flow — NAS Certification Flow on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
NAS Info — NAS Info on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
NCR Management — NCR Management on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Payment Cancelled — Payment Cancelled on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Payment Success — Payment Success on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Podcast — Podcast on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Podcast Manager — Podcast Manager on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Policy Builder — Policy Builder on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Post Job — Post Job on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Public CORE Courses — Public CORE Courses on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Public Register — Public Register on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Publish Tender — Publish Tender on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Publisher Portal — Publisher Portal on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
QMS Backoffice — QMS Backoffice on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
QMS Document — QMS Document on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
QMS Edit Document — QMS Edit Document on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
QMSISO Mapping — QMSISO Mapping on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
QMS New Audit — QMS New Audit on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
QMS New Document — QMS New Document on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
QMS New Impartiality — QMS New Impartiality on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
QMS New Review — QMS New Review on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
RAMS Checker — RAMS Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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.
Review Initial Application — Review Initial Application on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Sale Cycle Detail — Sale Cycle Detail on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Sales Guide — Sales Guide on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Sales Pipeline — Sales Pipeline on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Scheme Control — Scheme Control on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Scheme Readiness — Scheme Readiness on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Silver Application — Silver Application on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Start Accreditation — Start Accreditation on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Start Application — Start Application on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Subscription Required — Subscription Required on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Supplier Directory — Supplier Directory on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Supplier Management — Supplier Management on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Supplier Profile — Supplier Profile on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Supplier Signup — Supplier Signup on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Support — Support on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
System Audit Log — System Audit Log on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Tender Admin — Tender Admin on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Tender Alert Preferences — Tender Alert Preferences on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Tender Dashboard — Tender Dashboard on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Tender Detail — Tender Detail on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Tender Finder — Tender Finder on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Tender Publisher Dashboard — Tender Publisher Dashboard on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Tender Publisher Registration — Tender Publisher Registration on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Tender Readiness — Tender Readiness on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Training Evidence Checker — Training Evidence Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
View Member Profile — View Member Profile on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Procurement Page — Procurement Page on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Contractors Page — Contractors Page on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Suppliers Page — Suppliers Page on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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.
Compliance Hub Pricing — Compliance Hub Pricing on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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.
Safe Contractor Cost Comparison — Safe Contractor Cost Comparison on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Constructionline Vs Certification — Constructionline Vs Certification on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
CHAS Requirements Checker — CHAS Requirements Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
SMAS Requirements Checker — SMAS Requirements Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Constructionline Requirements Checker — Constructionline Requirements Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Safe Contractor Requirements Checker — Safe Contractor Requirements Checker on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Chas Smas Constructionline Safecontractor — Chas Smas Constructionline Safecontractor on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Constructionline Silver Vs Gold — Constructionline Silver Vs Gold on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Core Learning Admin — Core Learning Admin on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Rail NAS — Rail NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Local Authorities NAS — Local Authorities NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Utilities Infrastructure NAS — Utilities Infrastructure NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
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.
Flooring Tiling NAS — Flooring Tiling NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Groundworks Civils NAS — Groundworks Civils NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Scaffolding NAS — Scaffolding NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Fire Safety NAS — Fire Safety NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.
Security Access NAS — Security Access NAS on NAS National Assurance Standard. NAS National Assurance Standard certification scheme.

body { font-family: Arial, sans-serif; max-width: 900px; margin: 0 auto; padding: 20px; color: #1f2937; } h1 { color: #111827; } h2 { color: #374151; border-bottom: 2px solid #fbbf24; padding-bottom: 8px; } .tiers { display: flex; gap: 20px; flex-wrap: wrap; } .tier { border: 1px solid #e5e7eb; border-radius: 8px; padding: 16px; flex: 1; min-width: 200px; } a { color: #b45309; } nav a { margin-right: 16px; }

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 →