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Double Glazing: Benefits, Costs & Savings

girl and dog sat by double glazed window

A well insulated home will prevent less heat from escaping outside and mean that your heating won’t have to work so hard to reach the desired temperature. It’s reported that homes with single-glazed windows lose 20% of this heat through the windows and suffer from increased heating bills as a result.

The best way to combat this is with double glazing, which will not only keep more heat in your home but also reduce condensation and allow less outdoor noise into the home.

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What is Double Glazing?

Double glazing is the name given to windows that have 2 panes of glass, rather than just one, providing another layer of insulation to the home.

The 2 panes of glass aren’t touching, between them is a gas, most commonly argon, which helps to increase the insulation further.

Why choose double glazing?

Great insulation properties

Reduced noise from outside

Reduces damp in your home

Higher security than single glazing

Benefits of Double Glazing

As we’ve mentioned, double glazing acts as an added layer of insulation for your home, helping to keep the heat in and lower your heating bills. This is a major benefit of installing double glazing but there are many more:

  • Helps to prevents draughts from entering the home.
  • Less outside noise will make its way into the home.
  • Reduced condensation on the inside of the windows.
  • Increases the security of your home as 2 panels of glass is much tougher to break than one.

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Disadvantages of Double Glazing

Keeping the heat in your home during the winter is one of the biggest benefits of double glazing but it’s not appreciated quite so much during the summer, when it can make rooms hot and stuffy. You might want to consider having the windows tinted which will reflect some of the sunlight away, preventing outdoor heat from coming into the home, but this will add to the cost.

Double glazed windows that aren’t airtight are susceptible to condensation forming between the glass. Eventually, this could lead to the whole window needing to be replaced. However, if you hire a fully-qualified window installer, this shouldn’t be a problem.

How Much Does Double Glazing Cost?

There are many factors at play when determining how much double glazing windows could cost, including: size, style, framing material and the energy rating of the glass. When it comes to the energy efficiency rating, glass that’s A-rated typically costs around 10% more than glass with a lower rating. However, what you pay for a more efficient glass for your windows, you’ll soon make up for in savings on your energy bills.

On top of the price of the double glazed windows themselves, you’ll also have to consider the installation costs. Your location can play a factor here, with homeowners in London facing higher prices for installation.

To get the best possible price on your double glazing installation, we highly recommend getting quotes from multiple sources so that you can compare and choose the one that’s best for you. We’ve made this process nice and easy with our simple online form that you can use to tell us the work you need and you’ll soon be contacted by up to 3 trusted window installers near you who will each provide a free quote.

uPVC Double Glazing Costs

Size Price
620x1050mm £130
620x1200mm £140
915x1050mm £140
1200x1050mm £175
1200x1200mm £215
1780x1050mm £275
1780x1200mm £290

Wooden Windows Double Glazing Costs

The cost of timber frames with double glazing will differ depending on the style and size. Use the tables below to find out how much timber casement and sash windows could cost before installation.

Timber Casement

Casement windows are the most conventional type of window in the UK, hinged on one side and opening outwards. The price for installing double glazed timber casement windows will vary depending on the size and whether they’re being installed on the ground or upper floors.

Size Price
600x900mm £800 – £900
900x900mm £1,100 – £1,200
900x1200mm £1,275 – £1,375
1200x1200mm £1,400 – £1,500
1800x1500mm £1,750 – £1,900

Timber Sash

Sash windows tend to be quite tall, with the lowest pane of glass sliding upwards to open. When it comes to installing double glazed timber sash windows, the same factors can affect the cost as with timber casement windows: size and floor they’re being installed on.

Size Price
600x900mm £1,500 – £1,600
900x900mm £1,650 – £1,750
900x1200mm £1,850 – £1,950
1200x1200mm £1,900 – £2,100
1800x1500mm £3,000 – £3,100

All of the potential costs we’ve highlighted in the above tables are before the installation, which you will have to add on to the price of the windows. To get the best deal possible on installation, we highly recommend comparing quotes from multiple sources.

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What Can Push the Price of Double Glazing Up?

It’s important to take into account that certain additional features, offered by many double glazing companies, can push up the cost of a widow installation.

For the cheapest double glazing, stick to uPVC windows but if you’re considering something beyond that, you’ll need to consider the following:

Frame material

Price can vary dramatically between window frame materials, for example aluminium frames could be as much as twice the cost of uPVC. You may however want to weigh up the pros and cons of each material, as some may have a longer lifetime or provide additional energy saving benefits.

Glass efficiency

A-rated windows offer a higher level of energy efficiency, however they will cost more than B-rated windows. You also have the option of having low emissivity (low-e) coatings added to your glass which will increase energy performance by up to 40% but it will come at a higher price.

Savings From Double Glazing

The Energy Saving trust have calculated the amount of money single-glazed homes can save each year by installing double glazing. These savings are for typical gas heated homes in England, Scotland and wales.

Energy rating Detached Semi-detached Mid terrace Bungalow Flat
A £120-£160 £85-£110 £65-£90 £55-£75 £40-£60
B £110-£145 £75-100 £60-£80 £50-£70 £40-£55
C £110-£135 £75-£95 £60-£75 £50-£65 £40-£50

Double glazing will take a long time to pay back through energy saving benefits and should be considered a longer term investment; the installation will create a warmer, quieter environment while increasing the value and aesthetic appeal of your home.

Are Double Glazing Grants Available?

Since the Green Deal closed in 2015, there are currently no government schemes available that can help finance your double glazing installation in the UK. However, there are several other schemes around that could potentially help with the payments:

  • Home Repair Assistance Grant
  • Care & Repair
  • Housing Aid for Older People Grant
  • Home Improvement Grants

To find out how to apply and if you’re eligible, take a look through our guide to double glazing grants.

Do Double Glazed Windows Require any Maintenance?

Double glazed windows require little to no maintenance, especially when they’ve only recently been installed.

It’s a good idea to open and close your windows every now and then to make sure that the hinges are still moving as they should. You should also test the locks on the frame, to give you the peace of mind that they’re still locking as they should.

Keeping the windows clean is an important part of window maintenance as it can help to prevent muck and debris building up around the frame that could prevent the necessary parts from moving. It’s possible to install self-cleaning double glazing, which breaks down dirt that makes its way onto the glass, which you should only wipe using products approved by the manufacturer.

When having double glazing installed around your home, remember to consider the warranty as you’ll be covered by the manufacturer in the unlikely event that the windows encounter any issues during that period.

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Are Your Windows Double Glazed?

There are 2 simple ways to check if your home is already fitted with double glazed windows:

  1. Take a look at the window’s inside edge, if you have double glazing then you’ll see 2 panes of glass with a space in between. Otherwise, there will be just 1 pane of glass which means that your window is single glazed.
  2. Open the window and press a finger to either side of the glass, if they’re close together then you have single-glazed windows, if there’s a fair amount of space between your fingers then you’re already enjoying the benefits of double glazing.

Secondary Glazing

A alternative to replacing your current single-glazed windows with double glazing is secondary glazing. This involves a single pane of glass being added to the existing pane, making it a secondary pane.

Secondary glazing is a cheaper alternative to having double glazing installed and you’ll still be able to benefit from reduced heat loss and listed buildings don’t require any planning permission.

Get Free Double Glazing Online Quotes

Once you’ve decided that double glazing is the right choice for your home, you’ll need to find a qualified window installer to fit them. By completing one of our simple online forms, you can get free double glazing quotes from trustworthy installers in your area.

After telling us the type of work you require in our form, we’ll match you with window installers near you and up to 3 will get in touch with you to provide a free, no-obligation quote. You’re then free to choose the one that’s best suited to you.

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