Window Replacement: What Are Your Options?

Window Replacement

If you have old, cracked, leaking, or mouldy windows which are failing to insulate your home, it will not only be less than comfortable, but could be causing your heating bills to be higher. Installing new double glazed windows is the most effective way to tackle the problem, but it is not the only option.

From draught proofing windows to installing top of the range triple glazed windows, here are your main options when it comes to improving the windows in your home.

Draught proofing windows

The first point to make is that high-quality double or triple-glazed windows installed after 2002 (with a FENSA certificate or stamp in the metal seal) should not require draught proofing. This is because the window installer complied with Building Regulations, used energy efficient products and was registered with the local council.

However, if your windows are older than this or you are not sure if the installation was FENSA approved, you may find issues with leaks and draughts in the gaps between the window and the frame, the caulk on the outside of the window frame, and the areas around any locks or catches. Just a small gap on each of your windows will add up to a significant amount of heat loss leading to costlier heating bills and increased carbon emissions.

To reduce heat loss, lower energy costs, prevent leaks, and stop dust or moisture getting into the home, you or a professional can take steps to draught proof the windows. Possible solutions include:

  • Silicone-based sealant or brush strips
  • Self-adhesive foam strips
  • Metal or plastic strips with brushes or wipers attached.
  • How much does draught proofing cost?

    If you choose to draught proof your windows by yourself, the cost will depend on the products you buy to complete the job. Alternatively, you could pay approximately £200 for a professional to draught proof your entire home, e.g. doors, keyholes, letterboxes chimneys, fireplaces, floorboards, skirting boards, loft hatches, pipework, cracks in walls, gaps around electricity fittings.

    Adding secondary glazing to single glazed windows

    If your windows are single-glazed, you may find it difficult to keep your home warm and noise pollution from the outside could become a nuisance. The most effective solution would be to replace single glazed windows with double or triple glazing, but sometimes this is not possible. Some may not be able to afford to replace their windows, while others may live in listed properties or conservation areas which prohibit modern window installations.

    Secondary glazing is a potential solution to this problem. By adding a second pane of glass to the window, you can improve heat and noise insulation without changing the character of the property and at a lower price than window replacement.

    How much does secondary glazing cost?

    The cost of installing secondary glazing will depend on the type of glazing you choose and the installer you hire to install it. Options include sliding, lift-out, magnetic, or fixed secondary glazing. On average, secondary glazing costs between £150-£400 per square metre, excluding the cost of installation.

    Installing double glazed windows

    Replacing your old windows with new, energy efficient double glazing is the best way to insulate and protect your home while reducing your heating costs.

    While secondary glazing adds another pane of glass to existing windows, double glazed windows are sealed units which contain two panes of glass with a gap in between them. They are also known as insulated glass units as the gap is filled with an insulating gas such as Argon. This makes the home more comfortable, cheaper to heat, and more secure as the windows are harder to break.


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    How double glazing insulates the home

    When cold air hits the external pane of glass, this cold air is transferred to the Argon gas layer which has a 34% reduced thermal transfer rate. This slows the conduction of heat. Double glazed windows retain heat in a room whilst stopping cold air from coming in from outside. This makes the home much more energy-efficient, so much so that since 2002 Building Regulations stipulate that all replacement windows have the be a minimum of double glazed C rated, unless the property is a listed building or in a conservation area.

    How double glazing makes the home quieter

    Double glazed windows also reduce the level of noise which enters the home by absorbing energy and slowing the vibration frequency as it transfers through the glass panes and Argon gas.

    How double glazing reduces condensation

    Air is full of moisture which becomes liquid when it cools, so when the air hits a cold surface such as an external window pane, droplets of water will form. Double glazing is sealed so that this moisture cannot enter the window frame or home, but it also minimises the problem because the panes are not as cold as they are in single glazed windows. This is because the gap between the double glazing keeps the internal panes warmer so the vapour does not turn to condensation.

    How much does double glazing cost?

    The cost of double glazing will vary depending on how many windows you have, the size and style of the windows, the frames you choose, and the installer you hire to carry out the installation.

    On average, installing uPVC casement windows with double glazing in a flat could cost between £1,500 and £2,750, while installing windows in a small detached house or large semi-detached house (with approximately 12 windows) could cost between £5,000-£8,000.

    To get the best price for double glazing, it is important to find and compare quotes from at least three companies. Send us an enquiry today and we will put you in touch with up to 3 reputable window installation companies so you can get the best deal.

    Installing triple glazed windows

    Triple glazed windows deliver the same benefits as double glazing, but to a greater extent as the three panes of glass are separated by two layers of Argon gas.

    On average, triple glazing will cost around 25-33% more than double glazing.

    Get quotes for replacement windows

    We have a network of window installers right across the UK and to find approved installers in your area, all you have to do is complete our simple online form. This will only take a matter of minutes and once you’re done, you’ll get free quotes from up to 3 window installers based in your area.


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