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How long does double glazing last?

How long does double glazing last?



What is the lifespan of double glazing and how do you know when double glazing needs to be replaced?

How long does double glazing last? How long does double-glazing last?

Sometimes even the simplest of questions don't have the simplest of answers. As much as 10% of the warmth in a home is lost through windows and doors. Making sure that yours are working at optimal performance is vital to avoid draughts and high energy bills. The material that the windows are made from, and the quality of their build and installation, are key factors in determining how long they will last.

Double glazing has come a long way since Everest first opened its doors over 50 years ago. Changes in manufacturing techniques and refinement of materials has seen the modern window produce a better thermal performance than ever. But this doesn't answer your question. Some of the factors that affect double glazing are:

Installation and build quality of the window

A poorly produced window will show a build-up of condensation between the glass panes early on in its lifespan. This is a sign that the window's seal has failed and that it isn't working as it should. Windows that are still under guarantee will often be repaired or replaced without any further cost.

At Everest, we offer a leading lifetime guarantee against fog and condensation between the panes of the sealed units* for peace of mind. A draught around the window's frame and a gap between the sill and frame are noticeable signs of poor installation.

The placement of the window

Prolonged exposure to direct sunlight or extreme cold causes the window frame to expand and contract. Windows are largely designed to handle this, but over time this will affect the window's thermal performance. Natural factors including wind and the salty air of coastal areas could also have a detrimental effect on the window.

Windows are made from a variety of materials. Each of these materials has natural properties that affect its lifespan. We're going to break down these factors for uPVC, aluminium and timber.

What is the lifespan of uPVC windows?

What is the lifespan of uPVC windows?

uPVC stands for Unplasticised Poly Vinyl Chloride. Due to its robust, secure and virtually maintenance-free nature, the material is a favourite in the construction industry. The design of uPVC windows makes them highly energy-efficient and a popular choice throughout the UK.

On average, a double glazed uPVC window will last around 20-25 years.

What is the lifespan of aluminium windows?

Strong, durable and contemporary are just a few words associated with aluminium windows. The material is robust and, when combined with our multi-point locking system, makes the window exceptionally secure. The polyamide thermal break in our aluminium windows negates the material's natural heat conductivity, keeping the warmth in your home.

Aluminium windows are estimated to last around 45 years.

What is the lifespan of aluminium windows?
What is the lifespan of wood windows?

What is the lifespan of timber windows?

Traditional timber windows have come a long way since they were first used centuries ago. Modern enhancements have optimised its thermal performance while maintaining its stunning natural aesthetic. Wood provides the lowest heat conductivity of any frame material and is recyclable, making it exceptionally sustainable.

With regular maintenance, timber windows can last up to 50 years.

So, how long does double glazing last?

On average, you can expect double glazing to last around 20 years.

How do I know if my double glazing needs replacing?

There are a few key signs that your double glazing may need to be replaced:

  1. Draughts
  2. Condensation between the glass panes
  3. Damage
  4. High energy bills


Do your windows whistle in the wind? Feel around the frames of the window for air movement, can you feel a draught? Or maybe your room has become noticeably colder even while the heating is on. All of these are crucial signs that the seal in your windows may have failed.

Double glazing features a layer of Argon gas which sits between the 2 panes of glass and acts as an insulator. If the seal of the double glazing has released this gas, this drastically affects the windows ability to keep the elements at bay.

Condensation between the glass panes

Condensation between the glass panes is a sure sign that the layer of insulating Argon gas has been released.

This problem causes a sizable headache for most homeowners as it's recommended that the double glazed windows should be replaced. However, Everest customers receive a lifetime guarantee against fog and condensation between the panes of the sealed units*


Damage doesn't just affect the look of the window. Even the smallest of hairline cracks could release the layer of insulating gas in your double glazed window, affecting the comfort of your home considerably.

The layer of Argon gas also acts as a sound barrier. If you notice an influx of outside noise permeating the home, it may be time to think about replacing your double glazing.

High energy bills

Is your home expensive to heat in relation to its size? Ineffective double glazing allows meandering draughts which produce an uncomfortable chill throughout the home. This could require heating to be on longer to maintain a relatively comfortable temperature.

If you've noticed any of the signs we've mentioned, or to speak about to our expert advisors about replacing the windows in your home, give us a call 0808 302 6476 or request a free quote below.

Check out our window buying guide to help you find the perfect window for your home.

*The lifetime guarantee excludes the Everest essentials range.


Book your free quotation appointment with one of our local expert consultants who will:

  • Provide an accurate, no-obligation quote
  • Offer ideas and practical solutions
  • Show you samples of our products
  • Take all necessary measurements


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