A discreet secondary glazing system fitted to the room-side of your existing windows — dramatically improving thermal and acoustic performance without altering original frames.
Secondary glazing is ideal when you can't or don't want to replace existing windows. A slim aluminium frame with a separate glazed panel is fitted on the inside of your existing window — creating an additional air gap that significantly improves both thermal insulation and sound reduction. Original windows remain untouched.
Listed & conservation areas
Secondary glazing doesn't alter original windows, making it the approved solution where replacement isn't permitted.
Excellent acoustic performance
The air gap between original and secondary glazing is highly effective at reducing external noise — valuable near busy roads or airports.
Significant thermal improvement
A well-fitted secondary glazing system can reduce heat loss through windows by up to 65% compared to single glazing alone.
Discreet appearance
Slim aluminium frames in White or complementary colours sit within the window reveal — invisible from outside.
We assess your existing windows, discuss opening configurations and advise on the best secondary glazing system for your requirements.
Every secondary glazing panel manufactured to your exact window reveal dimensions for a precise, draught-free fit.
Fitted by our own team with minimal disruption. No alteration to existing windows or reveals.
Modern secondary glazing uses slim aluminium frames, typically 20-25mm wide, fitting within the existing window reveal. From outside, original windows look completely unchanged. From inside, the slim frame is largely unobtrusive.
Yes — we offer sliding, lift-out and hinged secondary glazing panels that allow the original window to be opened for ventilation when needed.
For thermal performance, replacement windows typically outperform secondary glazing. However, secondary glazing is often better for acoustic insulation — particularly when the air gap is 100mm or more.
Secondary glazing doesn't alter the external appearance of your property, so planning permission is not normally required — even for listed buildings. Always confirm with your local authority for Grade I listed properties.
Free survey, no-obligation quote, professional installation.