Sash Window Secondary Glazing
Specialist secondary glazing for Victorian, Georgian, and Edwardian sash windows. Preserve the character of your period property while dramatically improving thermal and acoustic performance.
Purpose-Designed for Sash Windows
Vertical Sliding
Mirrors the operation of your original sash window for familiar, easy use.
Heritage Sensitive
Designed to complement period architecture without compromising character.
Thermal Performance
Dramatically reduce heat loss through single-glazed sash windows.
Sound Insulation
Effective acoustic barrier for properties on busy streets.
Why Sash Windows Need Secondary Glazing
Original sash windows are a defining feature of London's period architecture. Georgian townhouses, Victorian terraces, and Edwardian villas throughout the capital feature these elegant windows — but single glazing means significant heat loss and poor acoustic insulation.
Replacing original sash windows with double-glazed units often isn't an option. Many properties are in conservation areas or are listed buildings where alterations to the external appearance are restricted. Even where replacement is permitted, modern units rarely match the aesthetic quality of original windows.
Secondary glazing offers the ideal solution. By fitting a discreet internal window system, we can deliver superior thermal and acoustic performance while your original sash windows remain completely untouched. The secondary glazing operates independently, with our vertical sliding panels mirroring the operation of your original windows.
Solutions for Every Sash Window Style
Our most popular service. Victorian sash windows typically feature larger panes with horns on the bottom rail. We match the sightlines to maintain visual harmony.
- Vertical sliding panels
- Slimline aluminium frames
- Optional tilt-in for cleaning
Georgian sash windows with their distinctive six-over-six or similar glazing patterns require careful consideration. Our solutions respect the original proportions.
- Unobtrusive profiles
- Heritage colour matching
- Conservation officer approved
Edwardian properties often feature sash windows with decorative upper panes. Our secondary glazing allows the original detailing to remain visible.
- Clear views of original glazing
- Multiple opening options
- Enhanced security
Sash Window Specialists Across London
We provide specialist sash window secondary glazing throughout London:
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