Golden Ratio Sash Windows & Doors

Golden Ratio Sash Windows and Doors: London's Heritage Joinery Specialists. We preserve the architectural soul of London homes through expert restoration and bespoke timber joinery. Specialising in Victorian and Edwardian sash windows, casement windows, and entrance doors, we balance traditional aesthetics with 21st-century thermal performance. Our services include bespoke stained glass design and our signature Stained Glass Encapsulation process — restoring heritage leadlights sealed within energy-efficient double glazing. FENSA-registered, CSCS-qualified, free site survey.