The Cavity Wall Insulation Self Certification scheme (CWISC) provides homeowners with the comfort of knowing that work by registered contractors complies with the requirements of the Building regulations. The scheme is operated by the Cavity Insulation Guarantee Agency (CIGA) in association with the British Board of Agrément (BBA), and has been approved by the Department of Communities and Local Government.

Registered installers under the scheme must comply with detailed technical requirements and installations are subject to regular independent inspections and audits. A copy of the scheme rules is available here. Shortly after completion of the work a certificate of conformity will be forwarded by post. This is an important document that you will require if you move or sell your home, so should be kept in a safe place but duplicates are available for a small charge.

Qualifying installations also receive a CIGA independent 25 year Guarantee against defects in materials and workmanship. To date CIGA has issued 4m Guarantees, which, together with the certificate of conformity with the Building Regulations provides householders with complete peace of mind.

There is no annual or joining subscription for installers to join CWISC and once admitted to membership a fee is charged for each job completed under the scheme. This fee includes provision of the CIGA Guarantee and is currently £7.50 plus VAT for each standard property or flat of up to 12m in height.