Both schemes let installers self-certify replacement windows. Here's what actually differs between them.
FENSA and Certass are both government-authorised Competent Person Schemes. That means installers registered with either scheme can self-certify their work as complying with Building Regulations. Both provide the certificate you'll need when you sell the house.
FENSA was set up by the Glass and Glazing Federation (GGF) in 2002. Certass was set up as a smaller competing scheme. Historically FENSA had wider recognition; today both are recognised equally by conveyancing solicitors and mortgage providers.
Both schemes offer insurance-backed guarantees (IBGs) that protect the homeowner if the installer goes out of business. Details of coverage vary between the two schemes' underwriters — ask your installer for the IBG documentation and read what it actually covers (usually 10 years product, sometimes shorter workmanship).
Not much. Both schemes vet installer competence, insurance and financial standing. What matters more is whether the installer is registered with one of them at all, and whether their insurance-backed guarantee is a policy from a recognised UK insurer. Both schemes deliver this; unregistered installers don't.
Some installers advertise 'FENSA and Certass registered'. In practice you can only be registered with one at any given time for the same scope of work. Ask which scheme covers your specific installation and check that scheme's website (fensa.org.uk or certass.co.uk) confirms the installer's active membership.
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