Quieter, warmer rooms – without replacing your windows.
Secondary glazing is a slim, discreet second window fitted on the inside of your existing one. It is ideal for period homes, conservation areas and flats where the original windows need to stay – and it makes a real difference to noise, draughts and heat loss.
- Made to measure
- Fitted by our own team
- Ideal for period and listed homes
- Free survey
Why choose secondary glazing?
A great choice when you love your original windows but not the noise and cold that come with them.
Less noise
The air gap between the two windows cuts traffic, train and aircraft noise. Acoustic glass and a wider gap give the best results.
Warmer rooms
A second, well-sealed window reduces draughts and heat loss, so rooms feel more comfortable and your heating works less hard.
Keep the character
Your original sash or casement windows stay in place, untouched – perfect for period, listed and conservation-area homes.
Discreet design
Slim frames are made to measure and finished to blend with your window reveals, so they are barely noticeable.
Extra security
A second locking window adds another barrier for anyone trying to get in.
Quick, tidy fitting
Secondary glazing fits inside the existing opening, with no need to remove your windows or disturb the outside of your home.
Secondary glazing options
We recommend the right style for each window after a free survey.
For sash windows
Vertical sliding
Slides up and down in line with your sash windows, so the meeting rails line up and the view stays clean.
For wide windows
Horizontal sliding
Two or three panels slide side to side – easy to open for ventilation and cleaning.
For casement windows
Hinged
Opens like a door for full access to your original window, ideal where you open the windows often.
For windows you rarely open
Fixed or lift-out
The most discreet option with the best sealing. Lift-out panels can be removed for cleaning or in summer.
- Clear, acoustic, toughened or low-energy glass
- Slim, made-to-measure frames
- White or a colour to match your interior
- Discreet locks and easy-glide runners
Is secondary glazing right for you?
It is often the best solution when replacing the windows is not possible or not wanted.
Ask us for advice- Listed buildings and homes in conservation areas
- Flats where the freeholder will not allow new windows
- Homes on busy roads, railways or flight paths
- Original sash windows you want to keep
- Bedrooms and home offices that need peace and quiet
Secondary glazing styles
Slim, made-to-measure secondary glazing sits discreetly behind your original sash and casement windows – choose the opening style that suits each room.
Secondary glazing: frequently asked questions
Will secondary glazing reduce noise?
Yes. The air gap between your original window and the secondary unit is what reduces noise. For the best results we recommend acoustic glass and the widest gap your window reveals allow.
Do I need planning permission for secondary glazing?
Secondary glazing is fitted inside your home, so it does not usually need planning permission, even in a conservation area. Listed buildings may need listed building consent, so we always recommend checking with your local council first.
Can I still open my original windows?
Yes. Sliding and hinged secondary glazing opens easily, so you can still open your original windows for fresh air and cleaning.
Can secondary glazing be fitted to sash windows?
Yes. Vertical sliding secondary glazing is designed for sash windows, with the meeting rails lined up so it stays discreet from inside and outside.
How long does installation take?
Most homes are fitted in a day or two, depending on the number of windows. There is no need to remove your existing windows.
Is secondary glazing better than double glazing?
It depends on your home. Double glazing replaces the whole window, while secondary glazing keeps your originals. For noise, secondary glazing with a wide gap often performs better. We are happy to advise on the best option during a free survey.
Related: Sash windows · Casement windows · Survey services · Installation types
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