All our door systems are certified through one or more UKAS accredited Third-Party Certification (TPC) scheme. Within each of these systems, one or more of our door products are contained.
Each TPC scheme has their own rules and requirements for membership. You can approach any certification provider with queries relating to their scheme rules and the methods to which they are applied. We would always recommend using a certification scheme that is accredited by UKAS and willing to communicate their certification in a transparent way.
You can read more about Third-Party Certification here.