Certass
Windows and glazing · Certification body and window and door self-certification scheme
Certass operates certification for eligible replacement window and door installations. Its certification scheme and the associated trade association benefits are related but not identical services.
Checked Official sources below.
What it covers and whether it is required
The self-certification route allows approved businesses to notify qualifying work under Building Regulations. Membership is voluntary; the building work still needs the correct compliance route whether or not Certass is used.
Joining requirements and costs
Applicants submit their business documents and are assessed against the scheme requirements. The current joining page explains the application and certification process. Confirm the scope, assessment frequency, guarantee requirements and complete fee structure for your business.
Check the current fees with Certass before applying. Ask whether the quotation includes application, assessment, renewal and any per-job charges. Use published fees or ask for a written quotation.
What it means for homeowners
Check current certification and that your work falls within the registered scope. Obtain the compliance certificate, written guarantee and any separate insurance-backed guarantee. Do not assume trade association membership alone proves that a particular installation has been notified.
How to check a claim
Official member, card or certificate check: Certass.
Match the record to the named person or contracting business. Check the current scope, not just a logo on a van or an old certificate. If the public record does not show the detail you need, ask the body to confirm it before appointing the business.
Where the scheme applies
The relevant replacement glazing self-certification route applies in England and Wales. Confirm other certification services and territorial scope with Certass for work elsewhere.
Common questions
Does Certass membership mean every kind of building work can be self-certified?
No. Self-certification is limited to the business’s approved scheme scope and territory. Check the actual work and certificate required.
How do I check Certass status?
Use the official verification service linked in this guide. Match the person or legal business name, current status and relevant work category. For a guarantee, check the document issued for your contract as well.
Official sources
- Certass: self certification scheme
- Certass: competent person scheme current schemes and how schemes are authorised
Sources checked November 2026. Scheme rules can change; confirm current requirements before applying or signing a contract.