Audited, accredited, on every framework.

CHAS (the Contractors Health and Safety Assessment Scheme) is one of the UK's longest-established SSIP-recognised health-and-safety pre-qualification schemes. CHAS Accredited Contractor status confirms an organisation's health-and-safety policies, risk-assessment procedures and competence have been independently audited against a recognised national standard. GNAT UK Limited holds current CHAS accreditation and can supply certificates for pre-qualification on request.

RISQS (Railway Industry Supplier Qualification Scheme) is the pre-qualification scheme used by Network Rail and the wider GB rail industry. RISQS Verified status means a supplier has passed Network Rail's required audits for health, safety, quality, environmental and financial standards. Most rail-adjacent demolition and concrete-cutting work cannot proceed without a RISQS-verified contractor on site. GNAT UK Limited is currently RISQS Verified.

Constructionline is the UK's largest pre-qualification database for the construction industry. Gold Member is the highest standard tier — beyond basic compliance (Bronze) and SSIP-equivalent verification (Silver), Gold adds independent verification of insurance, equality, modern-slavery, environmental and quality-management policies. Tier-1 contractors typically require Gold Member status before pre-qualification.

The Common Assessment Standard (CAS) is a unified UK construction pre-qualification framework developed by Build UK and CECA to replace the previous patchwork of duplicate PQQs. CAS-verified suppliers have been independently assessed against a single, standardised question set covering health and safety, quality, environment, financial standing, anti-bribery, modern slavery and equality. Holding CAS reduces duplicate paperwork across major contractor frameworks.

Yes — GNAT UK Limited is a member of the National Federation of Demolition Contractors (NFDC), the trade body representing the UK demolition industry. NFDC members are independently audited against industry-specific competence standards including the NFDC Code of Conduct and operational safety requirements. Membership is restricted to demolition contractors who can demonstrate the necessary expertise, safety record and insurance cover.

The Water Jetting Association (WJA) is the UK trade body for high-pressure water-jetting work, including hydrodemolition. WJA Audited Member status indicates the contractor has been independently assessed against the WJA Code of Practice covering operator training, equipment maintenance and on-site safety procedures specific to high-pressure water work. GNAT UK Limited is an Audited Member.

Achilles BuildingConfidence is a pre-qualification scheme used widely across UK construction, particularly by Tier-1 main contractors, to verify supply-chain compliance with health-and-safety and quality-management standards. BuildingConfidence Audited status reflects a third-party, on-site audit of the supplier's systems, beyond paper-based pre-qualification.

SSIP (Safety Schemes in Procurement) is the umbrella body recognising compliant H&S pre-qualification schemes across the UK construction industry. Acclaim Accreditation is one of the SSIP-recognised member schemes, providing equivalent verification to CHAS for buyer organisations. SSIP recognition means that holding one accredited member scheme is acknowledged across all others — reducing duplicate audits.