Double glazed sash windows

Double glazing sash windows is easily done, and its a great way of saving heat and reducing noise, without spoiling the character of your home.

Keep your existing sash windows

Depending on the style of your sash windows we can fit slimline, double glazing into your original windows. Thus reducing landfill, keeping you warm, and best of all – saving a little piece of history.

Slimline double glazing

All of our slimline double glazing units are filled with gas, providing insulation, sound reduction, reduced condensation, and maximum thermal efficiency. You can choose which gas or thermal efficient glass we use depending on your requirements.

New double glazed sash windows

If we can’t fit slimline double glazing units into your existing sashes not to worry. We can create brand new sashes with the latest, energy-efficient units. And, in all cases, we carefully measure the dimensions of your existing sash windows and replicate any existing decorative features – creating double glazing that blends in seamlessly, whilst significantly improving your home’s thermal efficiency.


The thickness of the double glazed unit that we can fit will depend on the thickness of the existing sashes. These vary from window to window, but we usually fit a 14mm slim line double glazed unit (2 panes of 4mm glass and a 6mm gap).


If you’re finding it difficult to stay warm and cosy in your home, we can improve your house’s thermal insulation by using gas-filled double glazed units. We have lots of different options – from argon and krypton to xenon gas. If you’d like to explore these, you can read more here, or just give us a call to talk it through.