Supplier Verification You Can
Actually Evidence
NAS NAS gives procurement teams, supply chain managers, and principal contractors a public register of independently reviewed UK businesses — supporting consistent, structured contractor due diligence.
Ask your suppliers whether they hold NAS certification. Check the public register instantly, at no cost.
Why Procurement Teams Need More Than Paperwork
Reviewing suppliers consistently is one of procurement's most persistent challenges. Businesses submit varying quality of documentation, standards differ between organisations, and there is rarely a structured baseline for comparison.
Self-declarations and basic policy checklists are easy to produce but difficult to evaluate. Without a structured third-party review framework, procurement teams are left making judgement calls on evidence that hasn't been independently assessed.
NAS NAS provides an independent, evidence-based certification framework that gives procurement teams a credible reference point — one backed by structured document review, independent assessors, and formal certification decisions.
Structured Evidence Review
Every NAS certification is supported by reviewed documentation, not self-declaration.
Independent Assessment
Assessors operate independently from commercial interests. Decisions are made impartially.
Public Register
A freely accessible public register of certified UK businesses, searchable by procurement teams.
Consistent Baseline
Certification against the same structured criteria, applied consistently across all applicants.
What NAS NAS Helps You Review
NAS certification is evidence-based. Here is what the assessment process examines across each tier.
Business Documentation
- Company policies and procedures
- Health & safety documentation
- Risk management evidence
- Employment and governance records
Business Structure & Credibility
- Registered business verification
- Operational structure evidence
- Business maturity indicators
- Governance and oversight records
Compliance & Operational Standards
- Insurance and legal compliance
- Staff training and competence
- Ethical business conduct evidence
- Quality and operational controls
Certification criteria vary by tier (Basic, Silver, Gold). Higher tiers require more extensive evidence across governance, ethics, and operational management. Learn how the process works →
How Buyers Can Use NAS
Using NAS within your supplier review process is straightforward. Here are three practical ways procurement teams engage with NAS.
Check the Public Register
Visit the NAS Accredited Register and search for any business. Certificate status, tier, and issue date are all publicly visible at no cost.
Ask Suppliers Directly
Add a simple question to your supplier questionnaire: "Do you hold NAS NAS certification?" Suppliers can share their certificate number for independent verification.
Include as Part of Supplier Review
Use NAS certification as one component within your broader supplier onboarding, tender evaluation, or supply chain review framework.
Why This Matters for Contractor Onboarding
Consistent supplier qualification requires a reliable framework. NAS NAS provides procurement teams with a structured, independently assessed reference point that adds credibility to contractor review without replacing your existing process.
Consistency Across Reviews
All NAS-certified businesses have been assessed against the same structured criteria. This supports a more consistent approach to comparing suppliers.
Visibility and Transparency
The public register is freely accessible. You can verify a business's certification status independently, without contacting the business directly.
Structured Evidence Standard
NAS certification is not self-declared. Evidence is reviewed by independent assessors, providing a more robust foundation than documentation alone.
Supports Existing Frameworks
NAS is designed to complement — not replace — your existing due diligence, procurement policies, and statutory compliance requirements.
CIS Compliance Checks & Financial Health Scoring
Two powerful verification tools available to buyers inside the NAS Supply Chain Portal — at no cost.
CIS Compliance Data
Structured — Not Self-Declared
When a contractor shares their CIS data through NAS, you see structured, portal-sourced information — not a box ticked on a supplier form. CIS data is displayed in a consistent format across all contractors, making comparison straightforward.
- HMRC CIS registration status — registered or not registered
- UTR number provided and evidenced
- CIS deduction rate — Gross, 20%, or 30%
- HMRC verification date and next due date
- CIS risk indicator — Low / Medium / High (contractor self-assessed)
- Uploaded CIS evidence documents — verification letters, VAT certificates, UTR evidence
- CIS not required? Contractors can flag this explicitly so you're never left guessing
Important: NAS displays contractor-provided CIS data. This does not replace HMRC CIS verification, which remains the buyer's statutory responsibility under the Construction Industry Scheme regulations.
Financial Health Score
Live from Companies House
Run a live financial health check on any NAS contractor directly from the Supply Chain Portal. We pull current data from Companies House and generate a scored, plain-English financial stability report — so your team can make consistent, evidenced procurement decisions.
- Financial stability score 0–100 based on live Companies House data
- Accounts filing status — on time, overdue, and by how many days
- Confirmation statement status — current or outstanding
- Outstanding charges registered against the company
- Company trading age and registered status
- AI-generated plain-English procurement recommendation
- Risk flags — Low / Medium / High / Critical severity
Source: All financial data is drawn from Companies House public records. This tool supports — but does not replace — a full credit check or financial due diligence assessment required for higher-value contracts.
What This Means for Your Procurement Process
CIS data and financial scores sit alongside certification status, insurance, and workforce compliance — giving your team a single, structured view of each contractor.
PQQ Support
Answer financial standing and CIS questions in PQQs with data sourced from verified third-party records — not contractor self-declaration.
Faster Onboarding
Pre-populated CIS and financial data means fewer supplier questionnaire chasers and faster contractor onboarding decisions.
Consistent Scoring
Every contractor is assessed against the same financial criteria — making comparison across your supply chain fair and structured.
Audit Evidence
Financial checks and CIS data are timestamped and logged — providing an evidence trail for internal procurement audits and framework compliance.
What You See When a Contractor Shares Their Profile
NAS certified contractors share a secure link to their live compliance profile. You get far more than a certificate — you get a real-time picture of their compliance status, updated automatically.
Traffic Light Compliance Status
Every document, insurance policy, and certification item shows Green (verified & current), Amber (expiring within 30 days), or Red (expired or rejected). Risk is visible at a glance — no interpretation needed.
Assessor-Verified Documents
Every document marked as verified has been independently reviewed by an NAS assessor — not self-declared. You see the document name, verification date, and assessor sign-off status.
Live Insurance Status
Current insurance cover levels, policy types, expiry dates, and live status. If a policy lapses, the status updates immediately — you are never looking at last year's figures.
Named Workforce Compliance
See named operatives the contractor has registered — their roles, CSCS cards, IPAF licences, trade certificates — with live status for each individual. Verify before they arrive on site.
Confidence Score
An automated confidence score based on document freshness, verification status, insurance cover levels, and certification tier. An instant risk signal to support contract decisions.
Secure Share Links — No Login Needed
Contractors send you a secure, token-authenticated URL. You view their live profile with no account required. Links can be time-limited and tracked — the contractor can see who accessed their profile.
Live NAS Profile vs. A Static Certificate
Ask your contractors to share their NAS Buyer Summary link. It contains everything you need to verify their certification — structured, independent, and always current.
The NAS Supply Chain Portal
Housing associations, main contractors, NHS trusts, and public sector bodies get free access to a live supply chain dashboard — no subscription, no cost, ever.
Housing Associations
Monitor your entire repairs, maintenance, and new build supply chain. See live compliance status for every subcontractor without chasing a single document.
Main Contractors & Tier 1s
Verify named operatives before they arrive on site. See individual CSCS cards, IPAF licences, and trade certificates — not just company-level certification.
NHS, MOD & Public Sector
Demonstrate active supply chain compliance monitoring to auditors and regulators — not just point-in-time verification at framework award.
What You Can See — Live, Not Static
Every item below is live and updated in real-time from the contractor's portal. You're never looking at a certificate issued 12 months ago.
Policies & Procedures
View the contractor's current Health & Safety policy, environmental policy, equality policy, and all other compliance documentation — assessor-verified with dated sign-off.
RAMS Documents
Browse their library of Risk Assessments and Method Statements. See which RAMS are current, when they were last reviewed, and which tasks they cover.
Insurance Certificates
View live insurance status — Employer's Liability, Public Liability, and Professional Indemnity. See cover levels, policy expiry dates, and real-time status. Amber/Red flags appear automatically if policies lapse.
Named Workforce & Cards
See every registered operative — their CSCS card, IPAF licence, Gas Safe registration, CPCS card, NVQs — with live traffic-light status per individual. Perfect for site gate checks.
Live Compliance Score
An automated compliance confidence score updated daily — based on document freshness, verification status, insurance cover, certification tier, and workforce card currency.
NAS Certification Status
Current NAS tier and certificate status, issue and expiry dates, and full certification history. Verify any contractor instantly — no login or account required for basic checks.
Post a Work Requirement. Let NAS Return Suitable Contractors.
NAS TradeLink allows buyers, procurement teams, main contractors and supply chain managers to post a work requirement from the Supply Chain Portal. NAS then returns suitable NAS-certified contractors based on trade, location, live certification status, insurance, workforce records, training, availability and sector experience.
You choose who to invite. Contractors respond through the portal. The process is recorded as part of your supply chain audit trail.
What buyers can do with NAS TradeLink:
- Post work requirements from the buyer dashboard
- Match contractors by trade, region and suitability
- Check live certification and compliance status
- View workforce, insurance and document indicators
- Invite selected contractors to respond
- Shortlist suitable suppliers
- Keep an audit trail of matching, invites, responses and decisions
NAS TradeLink is a portal benefit. NAS does not guarantee work will be awarded. Buyers remain responsible for final appointment decisions.