Product approval & certification

BBA certification is recognised throughout the construction industry as a symbol of quality and reassurance. It's the vital ingredient in the provision of assurance, quality and integrity to a plethora of stakeholders in the construction industry.

Cavity Assessment Surveillance Scheme (CASS®)

The BBA Cavity Assessor Surveillance Scheme (CASS®) allows installers to survey and ascertain the suitability of a property for cavity wall insulation and based on this assessment, work with home owners to provide a solution.


When it comes to cavity wall insulation retrofits, it is clear that, in some cases, consumer confidence is being undermined by the perception that insulation is being installed into properties which are unsuitable.

To address this problem, the BBA has developed the Cavity Assessor Surveillance Scheme (CASS®).

Under this scheme, we check at the beginning of the process the suitability of properties proposed by Property Assessors for cavity wall insulation, and we provide independent third-party validation of suitability.

The costs of providing this additional level of consumer reassurance will be borne by the industry, not by the consumer, with the BBA ensuring a seamless process. Having liaised with the industry, DECC and the Guarantee Providers, we know that the major stakeholders are fully supportive of CASS® and we are confident that, in many cases, a successful property assessment will become a requirement for the issuing of guarantees.

What does it mean for CWI Property Assessors?

Cavity wall Property Assessors that work for companies that use other BBA approved products are required to have all property assessments verified by the BBA property assessment staff. 

What does it mean for householders?

The scheme has been introduced by the BBA to ensure that Property Assessors who carry out property services on homes do so against a strict set of requirements. Experienced BBA staff will determine if the property assessment satisfies the requirements which need to be in place for the successful installation of cavity wall insulation.

For further information on CASS® and related matters, please contact us

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