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.

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.

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

Draughts

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

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.

*The lifetime guarantee excludes the Everest essentials range.