Window Replacement: A guide.

new bay kitchen windows, double glazing casement windows,

Have you noticed cracks in your window glass? or is condensation between the panes becoming an issue? maybe draughts are flowing through the frames and causing your home to become colder than usual. If you’re experiencing any of these issues it may be time for a window replacement. This helpful guide will breakdown the average cost of window replacement and attempt to answer most commonly asked questions about double glazing & window replacements.

What is the average cost of replacing windows?

The cost of replacing your window can depend on multiple different reasons, the material, type, size, energy raiting and installers fee. On average fitting one double-glazed window as a replacement can cost you between £350-£600, but again this is just an average and can vary from installation to installation. On average for 3-bedroom house in the UK a full replacement of double glazing can be between £3000-£5000.

The triple glazing window is 30% more expensive than double-glazed and if you’re fancy of an aluminium or timber frame, prepare to pay 30-50% more than double-glazed fans. However, the question about the cost can only be answered definitely if the fitter visits your home and you’d take into consideration the style, type and type of the window you are looking for.

Which window styles are the most expensive to replace?

A double-glazed sash window is usually the most expensive window to replace because it costs around £600 to £800 per window, but this could depend on the dimension, colour, glass design and the unit’s finish. Double-glazed tilt and turn windows may be less expensive than sash, ranging from £500 to £600, while the most economical is the casement window which is around £300 to £400.

How long does double glazing last?

Most double glazed windows exposed to extreme weather conditions have an estimated lifespan of 20 years while those installed in a sheltered place and not subject to any harsh weather can last 5 to 10 years longer.

It’s one of the best advantages of double glazing that makes it ideal for Welsh home. Particularly the valleys, where we tend to suffer the worser end of the weather. Our installers specialise in Merthyr Tydfil & Aberdare homes.
This resilient material does not get rusty, nor is it prone to corrosion. It also does not warp, buckle or rot and it is very difficult to damage so intruders could not quickly enter your home. It gives excellent performance for years and even decades, and aside from its inherent aesthetics, it will make your home secured.

If double glazing is broken, can you replace the glass?

If your double-glazed windows are misted or cloudy, have broken or cracked glass, you don’t have purchase a new window because the glass is replaceable. This job wouldn’t take too long either, because experts just have to remove the glass unit, replace it with a new glass, and the beauty of your glass will finally be restored.

The average replacement cost of a misted double glazing is around £60 to £400 depending on whether you need an entire window or have the double-glazed units repaired.

What can I do to protect my double-glazed windows?

Double-glazed windows are virtually maintenance-free because unlike old-fashioned timber windows, it doesn’t need to be constantly repainted, and it does not rot. But if you want your double glazing to last longer, here are simple tips to protect it. It isn’t time-consuming, but it can help you spot problems and minimize the repair cost over your windows’ lifespan.

  1. Wash your windows and frames
    This one of the essentials in double glazing maintenance. Every window needs to be regularly cleaned at least once in a month to keep the parts moving freely and ensure that dirt won’t build-up on the glass or frames. The longer you leave it uncleaned, the more chances dirt will stick into it like cement. If this happens, trying to remove it can mean potential damage to the windows. If you need a guide on how to clean windows the right way, check out one of our articles without leaving streaks. It’s important to note that you should only use detergents approved by the manufacturer if you have self-cleaning glass to prevent damaging your double glazing.
  2. Check the locks and hinges
    The locks and hinges were designed and expected to last as long as the windows themselves. However, it’s still wise to inspect it regularly by unlocking and opening each window and checking if it moves smoothly without sticking or juddering. It would also be best if you would place the keys near the windows to open them quickly in case of fire.
  3. Lookout for damps and condensation
    When warm air meets the cold during winter, it’s pretty normal to see a small amount of condensation on your windows. However, if you’ve noticed that large amounts of condensation runs down the window panes, this could be a red flag that implies that leak or damage in your double or triple glazing.

So, beware of any signs of damp around your window including moulds on the walls or frame because even though moulds are not that harmful to most people, if you are sensitive to pores, these can cause allergies to flare up.

Additional tip: Wipe your windows every morning to keep moisture away and try to run a dehumidifier. And if possible and safe, ventilate your room by opening it slightly or fit some trickle vents into it.

  1. Vacuum tracks and runners
    If you are using a sliding window, ensure that the trucks and runners are free from grit using a hose from your vacuum cleaner. Simply open your windows and run it around. This trick is also useful in bifold doors because dirt build-up in the track can cause the doors to stick twist or leave its runners altogether.


Replacing your windows is costly, but doing so can benefit you in the long run, especially if your newly-fitted windows are energy-efficient, highly durable and secure. If you want to get the best deals, it would be helpful to compare quotes from different installers and ensure that they are based on the same number, dimensions and finish. But remember that if a window is drastically cheaper, it may not offer superior quality and performance. So, choosing the cheapest one shouldn’t be your priority when comparing different quotes. It would be best to try to stick with a reputable and ask specific questions. If you need more information about window replacement cost, drop us a message or call our number. We’d be happy to help you out, conduct an on-site survey or provide a comprehensive quote.

More To Explore