NAS Certification for
Drain & Drainage Businesses.
Drain clearance and drainage contractors working for housing associations, FM companies, and NHS trusts must demonstrate robust compliance — particularly around COSHH, Environmental Protection, and confined space working. NAS provides the independently assessed credentials your clients require.
Why Drain Clearance Businesses Need NAS Certification
Drain clearance contractors handle hazardous substances, work in confined spaces, and manage environmental risks — making compliance scrutiny from housing associations and FM clients particularly rigorous. NAS provides the independent certification that demonstrates your business operates to a defined UK standard.
NAS Basic — £349/yr
Health and safety policy and arrangements, risk assessments and method statements, COSHH, CDM duties, training, insurance and subcontractor checks — the SSIP core criteria.
NAS Bronze — £749/yr
Everything in Basic plus legal identity and licences, employers’ liability insurance, data protection, equality, complaints handling, employment terms and right-to-work checks.
NAS Silver — £950/yr
Everything in Bronze plus environmental and waste management, quality and corrective action, governance and conflicts of interest, competition law, pensions, working time and subcontractor approval.
NAS Gold — £1,150/yr
Everything in Silver plus 13 procurement modules: financial standing, anti-bribery and integrity disclosures, tax status, cyber security, ethical supply chain, sustainability and Building Safety Act readiness.
What You Get With NAS Certification
Certification goes beyond a certificate — it opens doors and gives you tools to grow.
Public Register Listing
Housing and FM buyers verify your NAS drainage certification on the free NAS register.
Drainage & FM Tenders
Access live drainage and reactive maintenance tender opportunities in housing and FM sectors.
Trade-Specific Questions
Your questionnaire includes questions for your trade, so the evidence you submit matches the work you actually do.
Assessor-Reviewed Evidence
An assessor checks your actual documents, so your certificate carries weight with buyers.
Expiry Reminders
Reminders before your NAS certificate, and dated documents you have submitted such as insurance, expire.
Annual Re-Assessment
Renewal includes a fresh evidence review, so buyers know your certificate reflects current documents.