How much is the average cost of double glazing windows?

The average cost of installing a double glazed window in your home is around £300-400.

Installing double glazing helps keep your home warmer, in turn reducing your heating bills and helping the environment. Double glazing sandwiches a thin insulating layer of air, or an inert gas such as argon, between two panes of glass. This insulating layer is sealed, keeping out the cold air and keeping the warm air in your home.

The BBC reports that a fifth of your home's heat is lost through the windows. As well as making your heating bills more expensive, it also results in British homes having as much of an impact on the environment as all the fuel burning vehicles we use in the UK.

Installing double glazing will not only reduce your heating bills by around £90 per year (according to the BBC) but it will also cut your CO2 emissions by a mighty 740kg every year.

The cost of double glazing depends on the type of windows you have, the size and the type of property. The Daily Telegraph reports that ‘for an average three-bedroom house, upgrading single glazing to the latest high performance double glazing (low-emissivity glass, gas-filled sealed units with warm-edge spacers) will cost £2,500 to £3,000’.

Website agrees, saying that the average cost per window will be £387 (based on double glazing being installed in eight windows at once.)

Bear in mind that if you live in a conservation area, or in a listed building, there may be special rules regarding the style and material of your windows. You may need planning permission to install double glazing and the cost may be significantly higher, especially if bespoke windows have to be made.

If you can't afford to replace all your windows, installing some double glazing is still a good idea. Pick the rooms that cost you the most money to heat and consider double glazed windows in those rooms.

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