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If you have old-style single glazed windows, it is likely that your home experiences draughts, cold spots and high heating bills. It is natural for a home to lose some of its heating, especially through its windows, but the amount of heat that is typically lost through single glazed windows is much higher than in homes with modern double glazing. The result is that the homeowner is forced to use a lot more heating, meaning higher heating bills, and a significant increase in the amount of carbon emissions produced by the property. In the current climate of rising energy prices and increased concern about the amount of carbon we release into the atmosphere, neither of these outcomes is a good thing.

The solution is to replace the windows with double glazing, but many people fear that the costs of installation may be prohibitive. In fact, it is possible to get a good deal on double glazing installation, particularly if you first of all obtain a number of quotes from a few reputable installers, and the overall cost need not be as high as you fear. To give you a general idea of the amount of money a homeowner can typically expect to spend, here is a guide to double glazing prices.

How much does double glazing cost?

The total amount that you can expect to spend on replacement windows depends on the following factors:

  • The number and size of windows and doors that need to be replaced
  • The type of windows that will be installed: casement or sash
  • The type of frame: wood, aluminium or uPVC.

The more windows and doors that need to be replaced, the more the installation will cost, and the the larger the windows, the more expensive they will be. However, it is always worth negotiating with the installer to bring the price down. If you don’t accept their initial quote, you might find that they come back to you with a cheaper offer.

With regards to the style of windows, sash windows are typically more expensive than casement windows – often costing as much as twice as much. And when it comes to frames, many homeowners find that uPVC is the most cost effective choice of material. Hard-wearing and easily maintained, it is cheaper to buy and easier to look after than wooden or aluminium frames, although it’s worth remembering that wood effect uPVC tends to be a little more expensive than standard white uPVC frames.

Here are some example prices: a single 600 x 900 white uPVC casement double-glazed window will typically cost around £300. A sash window of the same size is likely to cost around £500 to £600. For a door (again with a white uPVC frame), expect to pay in the region of £900. To get replacement windows for a semi-detached house (i.e. one with 8 windows to be replaced), it will cost over £3,000 for casement windows, or £5,000 to £6,000 for sash windows. To all of these prices, you can add up to 20% if the uPVC is to be wood effect, as opposed to white. For aluminium frames, add between 30-50%, with similar prices on offer for new wooden frames.

It is also always worth remembering that not only will your replacement windows provide you with a warmer and more comfortable home, but they will also help you to reduce your carbon footprint and heating bills. Many people see a reduction of around £170 a year on their bills as a result of replacing their old windows with new double glazing windows.


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