Double Glazing Costs: Compare Double Glazed Window Prices

Double Glazed Window Prices Guide

If you are looking to work out the cost of double glazing then read our double glazed window prices guide for helpful insight into double glazing costs.

Double glazed window prices will depend on specification such as style, size and number of windows you need installed. This guide will help you crunch the numbers.

At Double Glazing Quoter, we’re here to help you make the best choice for your home. We can help you find trusted and recommended window installers for quality replacement windows.

If you are looking to compare double glazed window prices then our double glazing cost calculator will help you work it all out.

Window Prices: What is The Average Cost of Windows?

The average cost of a double glazed window will range between £400 and £600 for a single window.

If you are in London, expect to pay 20-15% more for your windows.

It can cost around £2000 to install 4 standard double glazed windows in a flat and it can be more for a bigger UK home.

double glazed window prices

Prices will be affected by window style, size and the quantity of windows that need to be installed.

A sliding sash window for example, will often cost more than a standard casement and uPVC windows are also cheaper than timber or aluminium frames.

When it comes to size, the standard window measurement is 60cm x 90cm which will cost between £300 and £500. Larger frames of 90cm x 120cm will cost £500 to £700.

Take a look at our example price table below.

How Much Are Double Glazed Windows?

Property Number of Windows Price
Flat 4 £2,100
House 8 £4,300
House 10 £5,400
House 15 £8,000

The more double glazed windows you have installed, the more your double glazed window cost will be. If you are installing

For example, 4 windows in a ground floor flat is going to cost £2000. If you are having 10 windows installed in a two-storey house that’s going to cost £5000 or more.

Double Glazed Window Prices Calculator

Our double glazing cost calculator will give you an instant price for your replacement windows.

If you are looking for an estimate of how it would cost to install new windows in your home, start your double glazed window quote today.

What Will Your Window Quote Include?

Your quote should include a description of the windows you’re having, as well as a breakdown of all the window costs. It should also detail how long the installation will take.

Double Glazed Window Quote:

  • Technical survey of your property
  • The number, size and style of the windows
  • Full installation of the windows
  • Additional equipment for installation
  • Removal and disposal of old windows

If you’re unsure about any of the installation costs, ask your window installer to explain it to you. A professional will be happy to do this.

Avoid any installers who demand a large deposit upfront or pressure you in to signing a contract on the spot.

Cheap Double Glazing

At Double Glazing Quoter, we recommend you compare like-for-like double glazing quotes from a few installers. Get a feel for window prices in your area and compare costs.

To get an idea of window costs, use our free and easy to use window cost calculator.

Double Glazed Window Prices: Styles

The most popular window styles in the UK are casement, sliding sash, tilt and turn and bay windows.

Double glazed casement windows are the cheapest option due to their simple design. Sliding sash windows and bay windows are normally the most expensive.

Sash Window Double Glazing Prices

Sash window prices start from £500 and can increase to £1,000 depending on their size and specification.

Traditional sash windows are most commonly seen in Georgian and Victorian style properties.

When we see them on newer homes, they have often been designed to look traditional.

They are made of 2 framed panes of glass which slide over the other to open the window either vertically or horizontally.

How Much Do Sash Windows Cost?

Window Size Price per Sash uPVC Window
50cm x 50cm £500 to £700
100cm x 100cm £600 to £800
120cm x 120cm £800 to £1000

More Sash Window Prices and Sizes:

Casement Window Size Colour Guide Price
500mm x 500mm White £525 – £600
500mm x 500mm Wood Grain £625 – £700
1000mm x 500mm White £600 – £700
1000mm x 500mm Wood Grain £700 – £800
1000mm x 1000mm White £625 – £725
1000mm x 1000mm Wood Grain £725 – £825
1200mm x 1200mm White £725 – £825
1200mm x 1200mm Wood Grain £850 – £950

Casement Window Costs

Standard casement windows will cost between £200 to £500, depending on the their size and the number of frames you require.

Traditional casement windows are a popular choice and can be seen in many homes throughout the UK.

These windows are designed to open sideways, downwards or upwards. A great window to have in the kitchen, these windows are accessible and open wide for great ventilation.

Window Size Price per Casement uPVC Window
50cm x 50cm £300 to £400
100cm x 100cm £400 to £430
120cm x 120cm £430 to £500

Casement Window Prices: Fixed Window

Casement Window Size Colour Guide Price
500mm x 500mm White £150 – £175
500mm x 500mm Wood Grain £175 – £200
1000mm x 500mm White £175 – £200
1000mm x 500mm Wood Grain £200 – £250
1000mm x 1000mm White £200 – £250
1000mm x 1000mm Wood Grain £225 – £275
1200mm x 1200mm White £225 – £275
1200mm x 1200mm Wood Grain £250 – £300

uPVC Casement Window Prices (1 Opener)

Casement Window Size Colour Guide Price
500mm x 500mm White £250 – £300
500mm x 500mm Wood Grain £300 – £350
1000mm x 500mm White £275 – £325
1000mm x 500mm Wood Grain £325 – £375
1000mm x 1000mm White £300 – £350
1000mm x 1000mm Wood Grain £350 – £400
1200mm x 1200mm White £350 – £400
1200mm x 1200mm Wood Grain £400 – £450

Tilt and Turn Window Prices

A tilt and turn window will cost between £400 and £700, depending on specification.

These contemporary style windows have hinges at the side and the bottom so can be opened two ways.

The window can either be tilted inwards from the top using the bottom hinge, or it can open inwards using the side hinge.

These windows are perfect for upper storeys as they allow you to clean the window from the inside.

Window Size Price per Tilt and Turn uPVC Window
80cm x 80cm £420 to £580
100cm x 100cm £580 to 640
120cm x 120cm £640 to £700

More Casement Window Prices and sizes:

Tilt &Turn Window Size Colour Guide Price
800 x 800mm White £400 – £450
800 x 800mm Wood Grain £525 – £575
1000 x 800mm White £450 – £500
1000 x 800mm Wood Grain £550 – £600
1000 x 1000mm White £475 – £525
1000 x 1000mm Wood Grain £575 – £625
1200 x 1200mm White £500 – £550
1200 x 1200mm Wood Grain £625 – £675

French Casement Window Prices:

French Casement Window Size Colour Guide Price
500mm x 500mm White £450 – £500
500mm x 500mm Wood Grain £575 – £625
1000mm x 500mm White £475 – £525
1000mm x 500mm Wood Grain £600 – £650
1000mm x 1000mm White £500 – £550
1000mm x 1000mm Wood Grain £625 – £675
1200mm x 1200mm White £525 – £575
1200mm x 1200mm Wood Grain £675 – £725

Bay Window Costs

How much does it cost to double glaze a bay window? A bay window will cost between £1000 and £2000, depending on the size, materials and which double glazing supplier you choose.

Why do bay windows cost so much?

The range of bay window sizes are greater than average. Three or more casement windows make up the bay window, so when looking at bay window costs you have to consider casement window prices too.

Bay windows are also considered to be quite luxurious. They project outwards, beyond property walls. They can either be fitted to a normal aperture or be part of the house walls.

This extra space requires more glazing which is why double glazing bay windows can be more expensive than standard window designs.

Bay Window Prices (3 Section)

Casement Window Size Colour Guide Price
2400 x 1200 White £1050 – £1150
2400 x 1200 Wood Grain £1150 – £1250
2400 x 1500 White £1125 – £1225
2400 x 1500 Wood Grain £1250 – £1350
3000 x 1200 White £1150 – £1250
3000 x 1200 Wood Grain £1275 – £1375
3000 x 1500 White £1250 – £1350
3000 x 1500 Wood Grain £1375 – £1475

Bay Window Prices (4 Section)

Casement Window Size Colour Guide Price
3000 x 1200 White £1400 – £1500
3000 x 1200 Wood Grain £1525 – £1625
3000 x 1500 White £1500 – £1600
3000 x 1500 Wood Grain £1650 – £1750
3600 x 1200 White £1500 – £1600
3600 x 1200
Wood Grain £1650 – £1750
3600 x 1500 White £1600 – £1700
3600 x 1500 Wood Grain £1750 – £1900

Bay Window Prices (5 Section)

Casement Window Size Colour Guide Price
3600 x 1200 White £1850 – £2000
3600 x 1200 Wood Grain £1900 – £2050
3600 x 1500 White £1950 – £2100
3600 x 1500 Wood Grain £2050 – £2200
4000 x 1200 White £1900 – £2050
4000 x 1200 Wood Grain £2000 – £2150
4000 x 1500 White £2050 – £2200
4000 x 1500 Wood Grain £2150 – £2300

Replacement Window Benefits

Replacing old windows with new double glazing will help save you money, as well as give you a more secure and comfortable home.

For example, around a fifth of the heat your home loses is lost through inefficient windows.

double glazed window prices

Replacing old glazing with energy efficient windows will increase insulation throughout your home.

According to the Energy Saving Trust, new double glazing can reduce energy bills by up to £110 a year. Double glazed windows can even increase property value by up to 10%.

Most of us would like a warmer, quieter and more secure home that’s not too expensive to heat.

Investing in new windows brings many of these benefits, not only adding monetary value but improving home living.

The less heat your home loses through its windows, the warmer and more comfortable it will be.

This doesn’t only apply to single glazed windows but older double glazed ones too.

Old glazing can be significantly less efficient than new, glazed units. However, heat tends to be lost twice as quickly through single glazing.

When you replace your old windows and double glazing you will benefit from:

Lower Energy Bills
The better your home is at retaining heat, the less money required to heat it up!
Better Acoustics
Double glazing and secondary glazing is better at keeping external noise out. Double glazing is often recommended to homeowners who live in busy, built up areas.
Higher Security
2 panes of lass are harder to break than 1. This is especially true if the glass has been toughened or laminated. Modern double glazed windows are also available in a choice of high-security locks. This added security could help save you money on your home insurance.
The less fuel needed to heat your home, the less CO2 contribution. Double glazed windows will help to contribute to a better environment.
Less Maintenance
Less Maintenance. uPVC double glazed windows are less prone to leaks, draughts, rotting and warping. New windows will also come with a long guarantee.
Approved Appearance
Replacing old and tired looking windows will improve the aesthetics of your home, making it look prettier. If your house is South facing, double glazing can help reduce the fading of fabrics that prolonged sun exposure can cause.
Increase In Property Value
Double glazing can be a major advantage when it comes to selling your home. Potential buyers are likely to look upon our home more favourably if it is double glazed. It means they won’t have to pay for the improvements themselves.

What Types of Glazing Are There?

The three main types of glazing are: double glazing, secondary glazing and triple glazing.

Triple glazing can be even more effective but is often that bit more expensive.

Secondary glazing is an option for those on a tighter budget or live in a listed building or conservation area.

Double Glazing

Double glazed windows are constructed from 2 planes of glass. These 2 panes have air trapped between them, as opposed to single glazing which just has one.

It’s much harder for heat to escape 2 panes of glass and a layer of air which is why double glazing is much more energy efficient.

Replacing single-glazed windows in a typical 3 bedroom semi detached home with B or A rated glass, could help you save £75 – £110 a year.

Double glazing can last for up to 20 years. It can last even longer but over time, the gas between the panes can gradually leak out, making the window less efficient.

Do I Need Planning Permission to Have Double Glazing?

Planning permission isn’t required for double glazing unless you live in a listed building or a conservation area. In these instances, you will need to check with your local building authority. If double glazing is out of bounds then secondary glazing might be the next best option.

Secondary Glazing

Secondary glazing is where a second pane of glass is fitted inside your existing windows. If you have a listed building or live within a conservation area, secondary glazing may be the option for you. It isn’t as effective as double-glazing but it does offer more or less the same benefits.

Triple Glazing

Triple glazed windows are made from 3 sheets of glass, making them very efficient at keeping heat in, reducing outside noise and increasing security.

However, triple glazing is more expensive than double glazing and secondary glazing. Experts are still divided on whether it provides a big enough difference in benefits too.

Triple glazing will let less sunlight into your home because of the extra pane of glass. It’s also heavier than your average double glazing, so your walls will need to be assessed prior installation.

Double Glazing Vs Triple Glazing Costs

Triple glazing has 3 layers of glass instead of just 2 and this makes it more expensive than double glazing.

A triple glazed uPVC window will cost £100 to £200 more when compared to a uPVC double glazed window.

For example, a double glazed window will cost £350 but for a triple glazed window of the same size you can expect to pay around £500 or just under.

The price table below shows you the average price of triple glazed windows compared to double glazed windows.

In order to get a more detailed cost of triple glazed windows, a survey of your property will need to be carried out.

The costs of triple glazed windows will vary depending on where you live in the UK, as well as your individual window specification.

Window Frame Material Double Glazing Cost Triple Glazing Cost
White uPVC £420 to £650 £540 to £750
Wood Effect uPVC £540 to £720 £760 to £840

For a two bedroom flat, the cost to replace four windows with triple glazing will be around £1,950.

A two bedroom terraced with five windows could cost about £2,500 to triple glaze.

The main benefit to triple glazing your windows, is increased thermal efficiency. The energy efficiency of a window is represented by a U-Value. This measure show well a window can train heat.

When you triple glaze your windows, they will have a slightly higher U-Value than a standard double glazed window.

Triple glazing will keep your home that little bit warmer helping you to save on heating costs and keep energy bills low.

Thinking of replacing your windows with triple glazing?

The table below shows you how much you can expect to save each year by replacing your old glazing with double or triple glazing.

Glazing Type Energy Efficiency Detached Semi-Detached
Double A+ £110 £80
Triple A+ £175 £125
Double A £105 £75
Triple A £160 £110

The benefits of triple glazed windows:

  • Reduces heat loss
  • Improves security
  • The extra thickness helps to reduce external noise

The disadvantages of triple glazing:

  • More expensive than double glazing – may be a needless expense if your existing windows are still in good condition
  • Thicker glass means less light entering your home

Secondary Glazing Cost

Secondary glazing adds an additional pane of glass in front of our existing windows so you won’t need to replace them.

Secondary glazing is ideal for those on a tight budget as it is often half the price of double glazing.

This is dependent on window style however, as replacing traditional sash windows will cost significantly more. The glass will also determine the final price.

Type of glazing Secondary glazing  cost (Noise reduction) Secondary glazing cost (Draught reduction)
Sash windows £1057 + VAT £870 + VAT
Horizontal sliding windows £894 + VAT £685 + VAT

How To Get The Best Double Glazing

  • Compare quotes from different window companies.
  • Ensure window installers are accredited and certified.
  • Avoid companies with hard sale pitches. Reputable installation companies do not hard sell, instead they give you time to consider your options.
  • Do not be pressured into ‘on the day’ quotes. Compare local quotes and give yourself time to consider all window prices.
  • Buy at quiet times of the year. For example, December is usually the quietest time of the year for most double glazing companies. Buying double glazed windows in December will allow you to secure a great deal.
  • Don’t be afraid to negotiate.

Glass Types

Annealed Glass

Annealed glass is a commonplace, inexpensive and tough material. After being formed, it is slowly-cooled and left to rest at a temperature where it becomes too hard to manipulate.

This steady and consistent temperature helps the glass to resist shattering and mechanical shock during installation.

Tempered Glass

Tempered glass is more durable than annealed glass. It undergoes a final stage of heating to make it even stronger.

Tempered glass when broken, will shatter into tiny pieces. Therefore, it’s ideal for use in windows. It can be used without fear of serious injury should it break.

Safety Glass

Safety glass has each pane reinforced with a thin layer of tough plastic, like polyurethane. If the glass breaks, it won’t fall to the floor.

What is Low-E Glass?

Low-E Glass or low-emissivity glass as it is also known, reflects far  more heat than standard glass.

It’s a sensible choice for homeowners looking to control the interior of their home. It is made with a microscopic thin layer of metal that reflects the sun’s rays.

Self-Cleaning Glass

Self-cleaning glass has a coating of titanium dioxide. When it’s placed on windows, It responds to sunlight by transforming surrounding water molecules into hydroxyl radicals.

These help to break down any surrounding organic matter and once broken down, the dirt is easily washed away by rainwater.

Glass Styles

Clear Glass

Clear glass refers to glass that allows you to see clearly through the window. No shapes, colours or patterns. This is usually the standard glazing for double glazed windows and helps homes to be warm, bright and spacious.

Frosted & Obscure Glass

This glass style provides greater privacy and is translucent rather than transparent. It still allows light through but doesn’t give a detailed view so people cannot see much through it. This type of glass is perfect for use in bathrooms or cloakrooms.

Leaded Glass

Leaded glass uses strips of lead to hold small panes together, making a patterned design. Bevelled glass is cut with sloping edges.

Etched Glass

This type of glass was very popular during the Victorian era. It features decorative designs such as patterns, lettering or artwork.

Stained Glass

Stained glass is either a single-coloured pane, or different coloured panes combined to create a certain pattern or picture.

Window Frame Materials

uPVC Windows

Upvc stands for unplasticised polyvinyl chloride. This is the most common type of frame for double glazed windows in the UK.

It is a lot cheaper than traditional wooden windows. It’s also durable, low maintenance and will never tor, corrode or swell. These frames can last up to 35 years and are recyclable.

These frames are available in a wide range of colours and finishes, including woodgrain styles for a more traditional look.

Wooden Windows

Wooden frames look more traditional and are ideal for homes situated within a conservation area.

Timber frames are usually more expensive than uPVC and over time, require more maintenance. They need to be looked after properly and require regular painting as a protective measure.

Aluminium Windows

Aluminium frames are durable, secure and recyclable as well as being incredibly low-maintenance.

Aluminium will never rot, swell or rust. Strong and lightweight, these windows have incredibly slim sightlines which allow for enhanced light and better views. These modern windows offer a sleek, contemporary look in comparison with timber frames.

Window Colours | Coloured Window Frames

You can choose from a wide variety of colours and finishes for your double glazed windows. White, black, cream, grey, brown and even brighter shades are available.

If you are looking to maintain the traditional appearance of your home then a woodgrain finish will give your uPVC window a more authentic look.

You can even go for a dual colour option – one colour for the outside window frame and another one for the inside.

Double Glazing FAQ

How long does double glazing last?

The average life expectancy of double glazing is 20 years. After this time, double glazing won’t be as effective at keeping the heat in.

This is because the air or gas between the panes gradually leaks out, weakening the vacuum effect.

To get more out of your windows, it’s worth hiring a reputable installer and choosing quality A-rated windows.

Cheap windows are likely to last closer to 10 years so it’s well worth investing in quality windows.

Are double glazed windows worth it?

Double glazing has many benefits over secondary glazing and single glazing. It offers great thermal efficiency meaning your property is better insulated.

This results in fewer draughts, cold spots and cheaper heating bills. The added layer of gazing also offers better acoustics, so you’ll hear less noise from the outside.

It also increases security – double glazed glass can be more difficult to break than single glazing.

How much does it cost to double glaze a 3 bedroom house?

The average cost of double glazing a 3 bedroom house is £5000. The price could reach £7000 depending on the location, number of windows, style and materials used.

Double glazing per window costs between £400 and £600 per window. Installing 4 double glazed windows in a flat is likely to cost £2,000 – a lot less than the standard UK home.

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