How much does double glazing cost?

Replacing single glazing (or old double glazing) on your windows and doors will increase the security of your property, reduce your energy bills and help you better regulate the temperature of your home. This is probably why it’s so commonplace in most homes across the UK these days.

However, if you’re not currently benefiting from these types of windows or you’re looking to upgrade your current ones, we’ve put together this double glazing price guide to give you an idea of how much you’ll need to pay to install new double glazing in your home.

NB: Average prices are based on uPVC casement windows. The higher prices cover windows such as sash, bay and timber frames.

How much does double glazing cost?

Struggling to find an accurate price for double glazing? Costs will inevitably vary depending on the size of your house, the number of doors and windows you have, and what type of double glazing you choose. That said, here are some rough guide prices to help you plan your budget.

• For a home with 8 windows and 2 uPVC doors, the average cost will be about £6,000 – £15,000
• If you have 15 windows and 2 uPVC doors, the double glazing cost is around £10,000 – £24,000 
• Double glazing for a larger home with 20 windows and 2 uPVC doors will cost in the region of £14,000 – £32,000 

Double glazing hourly rates

If we assume an 8-hour working day, expect to pay a glazier or double glazing installer between £25 - £35 per hour, or £200 - £280 a day to fit your windows and doors.

As you’d expect, hourly rates vary by region, with London costing considerably more, so the best way to get an accurate idea of the hourly rate of a trusted double glazing installer in your area is to source some quotes.

What are the factors affecting the cost of double glazing?

A number of factors affect how much you pay for your home’s double glazing. These include:

• Number of windows and doors
• Type of windows and doors
• Quality and type of glass
• Type of window and door locks
• Access to the property
• Any scaffolding needed
• Where you live

It’s also useful to remember that double glazing quotes don’t usually factor in any special requirements, such as coloured door and window frames, A-rated windows, lead framed gloss, or special locking mechanisms.

If in doubt, ask your local double glazing specialists for an inspection and consultation before getting a quote.

Double glazing cost calculator

If you know what type of windows and doors you want to install, then you can calculate the cost of your new double glazing. This includes the materials and labour.

So, starting with the materials, the average cost for a uPVC casement window is £325, and the average cost for a uPVC casement door is £400. Then you have an average labour cost for two professionals of £500 a day.

Beyond the obvious number of units needed, there are a number of factors that will affect the cost of your double glazing installation, such as the specific type of windows and doors wanted, and the quality of the glass.

In addition, you can choose between different types of locks and surface finishes. Another factor to consider is access, as poor access to window or door apertures can result in the need to hire scaffolding at an average rate of £100 a day.

Once the job is done, it’s important to factor in £30 - £35 an hour for a plasterer to refinish internal areas around the windows, which are likely to have suffered some surface damage.

It’s always advisable to get accurate quotes based on your specific installation from a number of trusted and local double glaziers. When you do, make sure they give you a price based on a full assessment of your windows and doors. This is so you can be clear on the costs before you agree to the work going ahead.

What is the cost of replacing double glazing for a 3-bed house?

The larger your home, the higher the price of double glazing. The cost you’ll pay for double glazing will directly depend on how many windows and doors your home has. The cost of adding double glazing in a 3-bedroom house will generally be higher than in a 1-bedroom house.

When asking for a quote, it’s best to count your doors and windows and ask for a rough estimate based on those numbers rather than talking about the number of bedrooms in your home.

How much does double glazing cost for a new window?

One of the key factors that affects the replacement cost of double glazing for your home is the type of windows you have – both the style and material. For example, sash windows will cost more than casement windows, while uPVC will cost less than wood or aluminium.

The average double glazing cost for new uPVC casement windows is £1,000 per window. If you want double glazing for uPVC sash windows, you should budget around £1,500 per window.

Wood casement windows cost on average £1,500 each. For wood sash windows, the double glazing cost is about £2,500 per window, while double glazing for aluminium casement windows will cost approximately £1,250 each. Furthermore, you’d be looking at paying £2,000+ per window if you have aluminium sash windows.

Comparing double glazing prices

One of the key factors affecting the replacement cost of double glazing for your home is the type of windows you have – both the style and material. As long as you’re aware of them, you’ll be able to make an informed decision. We recommend speaking to at least three double glazing installers for quotes and then comparing them.

Keep in mind the following factors that may affect your rates:

• Type of glass:. There are different types of glass available, including toughened, frosted, and self-cleaning and they all have different prices
• Location of the windows. Double glazing windows on upper floors could cost more than those on the ground floor
• Energy efficiency ratings. Double glazing with high energy efficiency ratings will cost more
• Type of window or door. The double glazing cost for a new window varies according to the type of window it is. Similarly, different doors will also have different double glazing costs
• Your location and labour charges. London and the South East are more expensive than other parts of the country, so you’d be paying more in labour charges there

Types of windows and available glass upgrades

Overall, the choice of window type and upgrades will depend on various factors, including the building’s architectural style, budget, and energy efficiency needs. That’s why it’s essential to consult with a professional window contractor to determine the best window type and upgrades for your building.

Here are some of the most common types of windows, their benefits and potential upgrades:

Single hung windows

Single hung windows are one of the most popular types of windows in residential buildings. They consist of two sashes, one fixed and one movable, which can be opened by sliding them vertically. The benefits of single hung windows include their low cost, ease of use, and easy maintenance.

Upgrades for single hung windows include energy-efficient glass, which can reduce energy costs, and tilt-in sashes, which make cleaning your windows easier.

Double hung windows

Double hung windows are similar to single hung windows. However, both sashes are movable and can be opened by sliding them up or down.

The benefits of double hung windows include their versatility, as they can be used in a variety of architectural styles. They’re also able to provide better ventilation than single hung windows.

Upgrades for double hung windows include insulated frames, which improve energy efficiency. You can also include high-performance glass, which offers better insulation and reduces noise.

Casement windows

Casement windows are hinged on one side and open outwards. They provide excellent ventilation in almost any type of building.

The benefits of casement windows include their durability, security, and energy efficiency.

Upgrades for casement windows include multi-point locking systems, which increase security. You can also add energy-efficient glass, which helps to reduce your monthly bills.

Awning windows

Awning windows are similar to casement windows. However, they’re hinged at the top and open outwards from the bottom. They’re often used in basements and bathrooms where ventilation is essential but privacy is a concern.

The benefits of awning windows include their energy efficiency, versatility, and ease of operation.

Upgrades for awning windows include insulated frames, which improve energy efficiency, and soundproof glass, which can help to reduce noise levels.

Sliding windows

Sliding windows have two or more sashes that slide horizontally. They’re easy to use and also offer excellent ventilation.

The benefits of sliding windows include their affordability, versatility, and low maintenance.

Upgrades for sliding windows include energy-efficient glass to reduce energy costs. Reinforced frames also increase durability and security.

When you request a quote for your double glazing needs, try to give as many details as possible. Include the above factors as well as the size of your house. For example, if it has one, two, or three levels, and where all the windows are etc.

Double glazing quotes

If you’re at the point of wanting quotes for new double glazing, there are a few things you can do to make sure your price is as accurate as possible.

Firstly, count the number of windows and doors you need and note where they are on your property (e.g., front, back or side, upstairs or downstairs). It’s useful to have this information when you start talking to a local double glazier about your quote. If you want, you can measure the windows as a whole and the individual sections, but any professional double glazier will want to come out and do this themselves.

As a rough guide on what prices to expect, budget about £6,000 – £15,000 for a home with 8 windows upstairs and downstairs, and 2 uPVC doors front and back. If you have a large house, expect to pay between £14,000 – £32,000 for 20 double glazed windows and 2 uPVC doors.

It’s always sensible to keep a contingency fund of around 10 – 15% to cover unexpected costs or slight changes to the spec of your double glazed units. Whether you know what type of windows and doors you want or not, you can get quotes from locally recommended professionals using the free search tool below.

Which type of double glazing is best?

UPVC double glazed windows

uPVC, or unplasticised polyvinyl chloride, windows have a number of benefits. Financially, they’re a great choice, as they can be up to three times cheaper than wooden frames, and they deliver market-leading energy efficiency, keeping your heating bills down. In addition, they’re also recyclable, meaning when your windows are removed the plastic can go on to be reused.

uPVC windows and doors are also very durable and now come in a variety of colours and finishes, which includes a wood-effect. Easy to keep clean, they also come in a variety of styles, including sash and tilt and turn, and if you have a bay window, then a uPVC structure can be designed to perfectly accentuate that sweeping design feature on the front of your home.

Timber double glazed windows

Whilst not as energy efficient or cheap as uPVC, timber is, as you’d expect, the more environmentally friendly option when it comes to installing new double glazed windows on your home. Not only is wood naturally renewable, timber windows and doors also do not require the chemicals and intensive processes that uPVC units do in their manufacture.

Beyond being green, there is a consensus of opinion that wooden windows look nicer, more traditional, solid and subtle than uPVC, especially if your home is a period property. Available in the same range of styles as uPVC, if looked after, timber windows can last a lifetime, making the initial investment worthwhile.

Aluminium double glazed windows

Presenting a slimmer, sleeker and lighter profile, aluminium double glazed windows can give a home an ultra-modern look. Aluminium is a very strong and weather-resistant material (it’s used to build aeroplanes!), so you’ll find the greater initial investment will pay off in long-term durability and low maintenance.

Typically presented in its natural colour of silver, when it comes to double glazed windows, aluminium can be painted in a number of shades, meaning you’re sure to find an even more unique look for your property. As with uPVC and timber windows, aluminium double glazed windows can be designed to tilt and turn and fit a bay window.

Steel double glazed windows

Similar in appearance to aluminium windows, steel double glazed windows are ultra slim with minimal frames.

Echoing the style of traditional brick warehouse windows, they are typically installed on industrial heritage buildings, but have become popular with homeowners looking for that minimal, industrial look in their home.

Usually seen in black, steel windows are easily painted in all colours, enabling a double glazing specialist to match the finish to the vision you have for your property.

Available upgrades for double glazing

Although double glazing already provides good insulation, reduces noise, and enhances energy efficiency, there are various types and potential upgrades to consider, including glass options. Let’s explore the most common types below:

Standard double glazing

Standard double glazing consists of two glass panes with a gap between them. This gap is filled with air or an inert gas like argon and provides insulation. You can coat the glass panes with a low-emissivity (Low-E) coating that reflects heat back into the room and helps reduce energy bills.

Potential upgrades for standard double glazing include triple glazing, which adds an extra pane of glass for even better insulation and noise reduction. You can also include high-performance Low-E coatings, which offer better insulation and solar control, keeping your home cool in summer and warm in winter.

Laminated double glazing

Laminated double glazing consists of two or more glass panes with a layer of polyvinyl butyral (PVB) between them. The PVB layer acts like a barrier that prevents your windows from shattering due to an impact. This makes it an excellent option for safety and security.

Potential upgrades for laminated double glazing include additional PVB layers for improved safety and security and tinted glass for better solar control and privacy.

Toughened double glazing

Toughened double glazing is made of two or more glass panes that have undergone a heating and cooling process to make it stronger and more durable. The benefits of toughened double glazing include improved safety, reduced noise, and better insulation.

Potential upgrades for toughened double glazing include laminated glass for enhanced safety and security and Low-E coatings for better insulation and solar control.

Acoustic double glazing

Acoustic double glazing is designed to reduce noise transmission. This makes it an excellent option for homes and buildings located near busy roads or airports. It typically consists of two or more glass panes with different thicknesses and laminated or toughened glass for enhanced noise reduction.

Potential upgrades for acoustic double glazing include thicker glass panes and additional layers of PVB or resin for even better noise reduction.

In terms of glass options, there are various types available, including:

• Low-E glass has a special coating that reflects heat back into the room, making it an excellent option for energy efficiency.
• Tinted glass is coated with a film that reduces solar heat gain and improves privacy.
• Frosted glass is etched or sandblasted to provide privacy and light diffusion.
• Patterned glass has a decorative pattern that enhances the aesthetic appeal of windows while providing privacy.
• Self-cleaning glass has a special coating that breaks down dirt and grime, making it easier to clean.

Useful double glazing checklist

• Count the number of windows and doors you want to install double glazing in
• Speak to your local double glazing experts for professional advice and accurate quotes
• Shop around for fair and competitive double glazing costs
• Always hire a tradesperson with experience and relevant qualifications and/or accreditations
• Check installers are FENSA approved