Can Sash Windows be Double Glazed?

If there’s one question that we hear all the time, it’s whether sash windows are suitable for double glazing or not?

To help you decide, we’ve put together this short guide to help answer any questions you may have about double glazing and sash windows.

Can sash windows be double glazed?

Sash windows can indeed be double glazed.

Many owners of sash windows ask this question because of the traditional style of sash windows looking so loose and rickety.

This doesn’t mean they can’t be double glazed, though.

Sash windows will actually benefit from double glazing for increased thermal efficiency and better soundproofing.

In fact, it’s the perfect way to modernise sash windows – while allowing them to retain their antique charm.

Older sash windows need to be upgraded to double glazing and then maintained.

The only time that sash windows can’t be double glazed is in some rare instances where planning permission may be required.

Do I need planning permission for double glazing sash windows?

Conservation areas mean planning permission will probably be needed.

Listed buildings also have their own considerations – in most cases, getting planning permission isn’t possible.

What sort of situation would allow you to install double glazed sash windows in a listed building?

It is usually when you can prove that the existing sash windows are gone beyond repair.

Will double glazing cause the sash windows to look different?

Overall, the windows won’t look very different at all.

The frames may have some miniscule differences to the moulding for the inside/outside beads, and the glass will of course have the appearance of two layers.

Unless you’re a window expert, you probably won’t even notice the difference.

How will double glazing improve my sash windows?

In the modern age, almost all windows are now double glazed because of the completely superior insulation that double glazing offers.

It is simply two glass panes fitted into the same window, with some gas between the panes to keep warm air in and cold air out.

If you have poor insulation, that means you’ll be heating the air inside your house, just to then let it all go outside – it’s very expensive and very wasteful.

How long will the windows last?

It all depends on the quality of materials used and how well you maintain the windows.

Look for the best quality materials when installing the windows.

The windows could easily last for over twenty years (and probably much more) if you look after them, saving you money and energy in the long run.

Get in touch

We hope we’ve helped to give you more information about double glazing and sash windows.

If there’s something we haven’t covered, don’t hesitate to get in touch with us.