Approved document seven of the building regulations pertains to materials and workmanship.
It should be noted that this regulation only pertains to England and not Wales.
A high number of fenestration inspection failures [nonconformity] of inspections carried out by the competent person schemes such as Fensa Certass etc are in this regard.
Fenestrology can assess an installation and report on this criteria only. It should be noted however that this information does form part of our installation inspection set out previously.