Triple Glazing: Is It Worth The Extra Cost?

A window with a single pane of glass loses up to 10 times as much heat as a section of insulated wall the same size. In fact, up to 20% of the heat in your home escapes through the windows.

Upgrading the windows is one of the best ways to improve the thermal efficiency of your home, that’s great for the environment and your bank balance.

We’ve been told for years that we should change our windows from single glazed to double glazed.

But what about triple glazing?

Is it worth paying the extra cost and are they really that different?

Triple glazing benefitsFirst Things First…

Rather than choosing a window based on how many panes of glass it contains, you should first look at the WER rating. This is a far more reliable way of predicting how thermally efficient the windows will be once they’re installed.

WER stands for Window Energy Rating and is the UK’s standard method for calculating how much heat will be lost through a window.

The WER takes into account the following:

  • The “U” value which is a calculation of how thermally efficient the entire window is, both the glass and the frame.
  • The air loss through the window seals, if any.
  • The amount of the sun’s heat that passes through the glass to warm up your home.

The image below is an example of a typical window rating, the scale is from A++ to G, although some manufacturers and installers omit the A+ and A++ from the scale if their products don’t meet those standards:

WER rating for triple glazing windows

Not All Windows Are The Same

Not all windows are made from the same materials and to the same standard.

A poorly made triple glazing window could be less efficient than a well made double glazed window.

Security Features

When deciding on which type of window to install, the security features such as locks should be considered.

There is no doubt that breaking three panes of glass is more difficult and noisy than breaking one or two panes.

This, of course, means nothing if the window can easily be popped open with a crowbar.

Noise Reduction

Double glazed windows significantly reduce the amount of noise that would otherwise travel through a single pane of glass.

Unfortunately, the difference between double and triple glazing is negligible

If noise reduction and soundproofing are important to you, then it would be better to install a secondary glazing unit behind a double glazing window.

The extra space between the panes of glass will act as a sound barrier. The more space, the better. That’s why triple glazing isn’t very good at soundproofing – the space between each pane is reduced as the glass is sandwiched together.

You should also explore acoustic windows, these panes of glass are laminated with a translucent material that allows light through but reduces the amount of noise.

How Much Do You Think These Windows Will Cost?

This part of our guide is entirely optional.

We are conducting research into how much homeowners think certain home improvement projects will cost.

You can skip this question if you wish:

Triple Glazing Price Guide

When triple glazed windows first went on sale, they were considerably more expensive than double glazed units.

Fortunately, the window fitting industry is extremely competitive and there are thousands of installers and dozens of manufacturers in the UK.

This has resulted in a significant reduction in the cost of these windows.

Many installers now offer free upgrades from double to triple glazing.

Below is our price guide for triple glazing windows:

2-bed house: £2500 – £3500

3-bed house: £3500 – £5000

4-bed house: £6000 – £7500

Obviously, the number and size of the windows will affect the price, but our price guide above is a good starting point.


See How Much It Costs To Buy Your Windows Direct From A Wholesaler

Have you ever wondered how much it costs to buy the windows direct from a wholesaler?

Now you can.

This is a great way to see how much the windows cost, excluding the installation fee and disposal fee for your old windows.

First, you’ll need to measure the dimensions of all your windows, also jot down the number of window openers.

Then, head over to Modern Upvc Windows or Just Doors and Windows and select the size and type of windows you want.

The prices displayed include VAT but exclude delivery fees and of course installation costs.

You can compare these prices to the quotes you’ve been given by installers, you’ll then have a good idea of how much profit the window fitters are making.

Comparing Triple Glazing Prices to Double Glazing

Prices change all the time but at the moment you’ll probably find that triple glazing is around 10% more expensive than double glazing.

Keep an eye out for seasonal deals though.

Installers often reduce their prices during quiet spells such as in January or February.

So, yes, it is worth choosing triple glazing over double glazing if you intend to live in the house for a long time.

If you’re looking to move in the next few years, then you may not recoup the extra cost through thermal efficiency.

Get a Quote Online

If you would like to compare triple glazing window prices online, we can help.

Tap the button below and fill out the form to get the ball rolling.

There’s no obligation and it only takes a few minutes:

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