Thornbury's housing is market town with a Conservation Area covering the old high street, Cotswold stone properties, modern estate housing on the outskirts. Each demands a different replacement glazing approach — slim double-glazed units (10–14 mm cavity) for heritage frames, standard 28 mm units with argon for modern uPVC and aluminium, and triple-glazed specifications for new-builds chasing Approved Document L.
We've been supplying replacement sealed units across the Bristol catchment for 15+ years and Thornbury has always been part of that catchment (12 miles north of Bristol). Every unit is manufactured to BS EN 1279, comes with a 12-month workmanship guarantee, and is installed by FENSA-registered glaziers. Our diagnostic-first approach means we'll tell you when a repair beats a replacement and only quote a new unit when the existing one's seal is genuinely past saving.
Cotswold stone surrounds in the Conservation Area need careful sightline matching — slim double-glazed units are the standard heritage-friendly retrofit. For Conservation Area work, we supply slim double-glazed units that fit original timber sashes and casements; for new-builds, triple-glazed units with argon or krypton fill (see comparison).