RetroFit® Double Glazing by Metro Glass upgrades existing single glazed aluminium and timber windows and doors with new, factory sealed double glazed units, without requiring full replacement of the existing joinery. The system can improve thermal performance, help manage summer overheating and reduce outside noise. RetroFit® offers the biggest range Low E glass options that can be tailored to the home’s orientation, climate and performance priorities. RetroFit® Double Glazing is available nationwide and is backed by Metro Performance Glass’s local glass processing capability and nearly 40 years of glass and glazing experience.