Windows or insulation quotes

Replacing windows and doors, and improving insulation. They are usually done together because they are two halves of the same problem: how much heat your house loses.

Is your property suitable?

If your house is dated and the windows and insulation have never been touched, this is one of the few jobs where you feel the difference immediately and every day. It is not only the bills. It is draughts, cold rooms, condensation and noise.

Typical cost range

£1,725 – £13,800

Excludes VAT, and includes a 15% contingency allowance for the unexpected.

The figure depends on the type of window you choose and how many you are replacing. The other thing that moves it is access. If scaffolding is needed the cost rises, so it is worth knowing whether your quote includes it.

Because energy bills are part of the case for doing this, be careful with savings claims. A firm promising a specific annual saving is guessing at how you heat your house.

What to ask before hiring

Ask exactly which windows are included and to what specification. Ask whether scaffolding is in the price. Ask what happens to the existing frames and how the openings are made good afterwards. Ask what guarantee comes with the windows, and separately with the installation, because the two are often different lengths.

Red flags

A discount that expires today. Specific promised savings on your energy bills. A quote that does not itemise which windows are being replaced. Insulation offered without anyone looking at ventilation, since sealing a house up without thinking about airflow is how damp problems start.

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Windows or insulation

When the quotes come in

Almost nobody publishes what these jobs settle at, because the people writing about them are the people doing the quoting. If you go ahead, come back and tell us what you accepted. It takes less than 3 minutes, and it is the only way this page ever carries real numbers instead of estimates.

Add what you paid

Common questions

Will new windows really cut my energy bills?

They should help, but be careful with specific promises. A firm quoting you an exact annual saving is guessing at how you heat your house.

Why do quotes vary so much?

The type of window you choose and how many you are replacing, and whether scaffolding is needed to reach them. Ask whether scaffolding is inside the price or extra.

Is there a downside to insulating?

Only if ventilation is ignored. Sealing a house up without thinking about airflow is how damp problems start, so it should be part of the conversation.

What will I notice apart from the bills?

Draughts, cold rooms, condensation and noise. On a dated house where nothing has been touched, it is one of the few jobs you feel every day.