Extend your business expertise to include Certification from

British Assessment Bureau

    Certification from British Assessment Bureau
    Cavity Wall Extraction Certification

    Extend your business expertise

    British Assessment Bureau have adopted the Oscar Onsite Cavity Wall Insulation Extraction Scheme and are able to enhance Oscar Onsite members with additional certification.

    Compete in a fast-moving industry

    Benefits of becoming CWE certified
    • Win more business
    • Demonstrate competence in tenders
    • Certification designed with building product manufacturers
    • Instil confidence in customers and stakeholders
    • Oscar Onsite recognised standards

    How to get Cavity Wall Extraction certification

    There are 5 simple steps to achieve your British Assessment CWE certification


    Contact the team regarding Cavity Wall Insulation Extraction to receive a quotation.

    Documentation Preparation and QMS Login Submission

    Once documentation is prepared and ready for audit, submit details for inclusion onto the audit list. Audits will be carried out within 28 days.


    A desktop assessment of your systems and supporting documents are completed. If it meets the CWIE requirements you will be granted certification for 3 months and you will be added to the TrustMark register and website. If there are non-conformities, you will be required to submit a corrective action prior to granting certification.

    Site Assessment

    Within 3 months of the initial assessment, we will complete on-site assessments of work you have undertaken or are in the process of undertaking. These will be assessed against your system and the CWE requirements. Following this, your certification will be extended to a full 12-month term. If there are non-conformities, you will be required to submit a corrective action prior to us granting the extension.

    Annual assessment

    The excellent reputation of certification is driven by its requirement for ongoing assessment of compliance, so we’ll keep in touch and arrange annual assessments to keep your certification up-to-date and support you in maintaining an up-to-date project file on the Trustmark website.

    Learn more

    What is Cavity Wall Extraction?

    Cavity Wall Insulation Extraction and Clearance is the procedure whereby debris, rubble, obstructions and old insulating material is cleared from a cavity. Such obstructions are found in a surprising number of properties and regularly cause issues within the home, such as creating cold spots and damp problems.

    Who are Oscar Onsite?

    Oscar Onsite are an award-winning long-established UK wide accreditation body that provides training and assessments to contractors involved in Cavity Wall Insulation Extraction, to ensure they meet the National Occupation Standards and earn the recognised OSCAR. Oscar Onsite provide foundation training and accreditation and formal qualifications including NVQ Level 2 in Cavity Wall Insulation Surveying and NVQ Level 2 in Cavity Wall Insulation Extraction as a GQA Approved Training Centre. Oscar Onsite also provide Technical Monitoring and onsite support to members, and in association with their RICS partner firms, they offer a bespoke Cavity Wall Insulation Condition Inspection Survey directly to homeowners, Landlords, Local Authorities and Housing Associations, and through our network of member firms who have demonstrated their professionalism and quality of service above and beyond at all times.

    British Assessment Bureau is working in association with the Oscar Onsite Cavity Wall Extraction Scheme in offering a fully rounded service from Oscar Onsite training through assessments and on to certification by the British Assessment Bureau

    British Assessment Bureau