Trade associations and Professional Bodies for uPVC Single Windows

Assure Certification

Certass

Chartered Association of Building Engineers

Chartered Institute of Building

Double Glazing & Conservatory Ombudsman Scheme

FairTrades

Federation of Master Builders

FENSA

GGFi

Glass and Glazing Federation

Network Veka

SAFEcontractor

The Consumer Protection Guarantee

Which? Trusted Trader