How long does double glazing last?


Have you noticed your energy bills creeping steadily upwards? Occasional cold draughts coming through your living room, or leaking and condensation inside your windows?

There’s a reason people say nothing lasts forever – and your windows are no exception.

Double glazing typically lasts around 15 to 20 years if fitted properly – but with untrustworthy traders cutting corners, and the wear and tear from our wild weather, you can’t always be sure an older window is doing its job.

If you’re concerned your double glazing might be due for replacement, here’s a few ways to find out.


Dating your double glazing

Due to stricter building regulation, the number of homes with double glazing fitted jumped from 16% to over 60% between the 1970s and the 1990s. That’s almost half the homes in the UK fitted during that 20-year period! The industry was experiencing a huge boom, and today over 80% of UK homes have the majority of their windows double glazed.

However, any windows fitted during that boom will no longer be up to standard. No matter how well fitted, the seals on a window will eventually degrade and require replacement. The simplest way to tell if your windows need to be replaced is to find out when they were fitted. Here at Advanced, we recommend upgrading any windows fitted more than 10 years ago.

Unfortunately, if your windows were installed by a previous owner, then it might not be possible to date them accurately. In that case, you may have to examine your windows yourself for any signs of damage.


Assessing your double glazing

The initial tell-tale signs of damaged glazing are things you would probably have already noticed.

These include:

  • Frequently needing to wipe condensation from your inside pane
  • Cold draughts coming from between the window and the brickwork
  • Moisture being trapped inside the two panes of glass

All of these issues indicate serious damage to a window, which could be costing you when it comes to heating your home. You’re not out of the woods even if you haven’t noticed these problems though – any smaller signs of damage could turn into potential problems if left ignored. 

The only sure-fire way to determine if your windows are due for replacement is to give them a thorough investigation. You need to look closely at the seals, the frames, and the glass itself.


What to look for

Any breakage in the seal is a major problem. If you uncover a broken seal, we recommend upgrading to a modern, more robust window.

With your window frames you should look out for any sign of mould or rotting. These indicate your window is failing to protect your home from moisture, and could result in structural damage and damp.

Finally, with the glass, look for any minor cracks or chips. Just like with a car windscreen, these seemingly small problems create weak points which will only worsen with time – they need to be treated before they cause a bigger problem.

If you are unsure whether your windows require replacement, or feel unable to assess them yourself, don’t hesitate to get in contact with us. The team here at Advanced will make sure your home is protected from the elements.


Still not sold on double glazing?

If your home still doesn’t have double glazing installed, and you are trying to work out whether it’s a worthwhile investment, let’s break down the numbers.

Our A-rated energy efficient windows will save around £110 per year – compared to single glazing in a detached house – according to The Energy Saving Trust. Here at Advanced, we offer double glazed windows from only £295, with a 15-year guarantee. 

The potential energy savings from double glazing mean that in no time at all the windows will pay for themselves – and past that you’re in profit! 

Energy bills aside, double glazing still has much more to offer. It reduces outdoor noise, increases the value of your property, and better protects you and your loved ones from burglars!


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