Build Check Certification is Certass for their Thermal Rating Register (TRR) Scheme to provide door and windows energy ratings. We undertake audits on manufacturers who wish to apply to use the energy-rating label on their products. A regular annual audit is a basic requirement of these schemes.
Energy ratings provide independent verification of how energy-efficient your windows and doors are in meeting Part L requirements. The rating system is based on a scale of G to A+, with A+ windows being the most energy-efficient.