Your goal

Improve my windows

Replacing every window at once is rarely the right first move. Start with the worst-facing rooms, seal the gaps around the frames, and spread the rest over time.

See the order of work Find a local specialist

This goal usually involves

Seal around the windows
Upgrade the worst rooms
Replace what can’t be saved

Save the frames you can, replace the ones you can’t, and do the worst rooms first.

The pathway

Do it in this order.

Step one: Draught sealing

Seal around the windows

Before new glass goes in, seal the gaps around the frames you have. It’s cheap and quick, and it tells you which rooms still feel cold.

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Draught and weather sealingDoors, windows and the gaps around them.

Thermal imaging and insulation scansSee which windows lose the most heat.

Draught and air leakage testingFind the leaks around frames you can’t see.

Step two: Windows and glazing

Upgrade the worst rooms

Frames in good condition can take a second pane fitted inside, which costs far less than replacement and keeps heritage frames. Where the frames have had it, double glazing does the job properly.

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Secondary glazingA second pane inside the window you have.

Retrofit double glazingDouble glazed glass in the frames you already have.

uPVC double glazed windowsThe warmest and quietest of the common frames.

Double glazed aluminium windowsSlim double glazed frames with a thermal break.

Step three: Replacement

Replace what can’t be saved

Rotten frames, jammed sashes and doors that never sealed are worth replacing outright. Triple glazing is there for the coldest rooms and the noisiest roads.

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Window and door replacementRotten frames and doors that never sealed properly.

Triple glazed windowsThree panes for the coldest rooms and noisiest roads.

Not sure where to start?

Stop guessing, start saving: find your home’s energy score.

Don’t waste money on upgrades you don’t need. A professional home energy assessment shows where your house loses heat and power, so your budget goes where it makes the biggest difference.

Find an assessor near me

Specialists for this goal