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The average cost of replacement windows for a three-bedroom house in the UK is between £1,200 to £3,000. Balcony Door
uPVC is the cheapest frame material. It doesn’t have to look cheap however, with attractive colour options now on the market.
There are a few telltale signs: condensation between the panes, difficulty operating the windows, and noticeably higher energy bills.
The cost of double glazing windows , whether you’re seeking new installations or replacements, can significantly impact a homeowner’s budget. New windows costs can range between £1,200 to £3,000 for a three-bedroom house in the UK. While the initial outlay may seem steep, it’s essential to recognise the long-term value. Modern windows, including those with triple glazing , are not just about aesthetics but energy efficiency and reducing household heating bills.
Investing in high-quality, energy efficient windows can dramatically reduce household energy bills, ensuring that homeowners not only recoup their initial investment but also enjoy savings in the years to come.
Our experts examine the windows pricing structures, looking at window types , comparisons, and points to consider, providing the details you need to decide which new windows to choose.
The exact cost of your new windows will largely depend on the number of windows you need to install and chosen material type. We’ve calculated a range of costs for uPVC casement windows, which are the most common type installed in the UK, providing an estimate from low to high.
In the UK, there are several different types of windows; they come in different shapes and sizes and function differently to one another – these are the most common types of windows and their average costs:
When it comes to window prices, uPVC is the cheapest of all the available frame materials.
Unplasticised polyvinyl chloride (uPVC or vinyl) framed windows are a popular choice for residential properties. Thanks to its durability, low maintenance and cost-effectiveness, uPVC is a viable alternative to the more traditional timber and aluminium frame materials.
Typically, double-glazed uPVC windows have excellent insulation properties, helping to reduce energy loss, resulting in lower bills and a more comfortable indoor environment. They are also effective at noise reduction, and as most are pre-fitted with multi-point locking systems, they increase your home’s security level.
Once available only in white, many manufacturers now offer coloured uPVC windows and numerous finishes, allowing homeowners to individualise their homes according to their taste. Some manufacturers even offer uPVC that mimics the look of timber, giving homeowners the best of both worlds.
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Although uPVC windows pricing varies depending on the supplier, the table below shows the typical cost for standard white uPVC double-glazed windows.
Less popular than uPVC, aluminium windows tend to have a slimmer profile, allowing for greater glass real estate. This is because aluminium is a stronger material; however, it doesn’t offer the same thermal efficiency as uPVC. As such, aluminium windows can be prone to condensation and are cold to the touch in winter.
Like uPVC, aluminium windows are easy to maintain, requiring only an occasional wash to keep them looking good, and come in a choice of colours to match the aesthetics of your home.
Aluminium window prices are around 25 per cent more than uPVC.
Timber is a popular choice for homeowners looking to combine the benefits of double glazing with the traditional aesthetic of wooden window frames. Although timber frames can significantly increase your property’s value, they can work out at around 50 per cent more than uPVC, making them the most expensive option.
Timber can last many years when properly maintained, which means occasionally refinishing and repainting the surface to restore its weatherproof properties. It’s well-suited for older or period properties and homeowners who prefer the look and feel of natural materials.
The price of windows is dependent on several factors, including frame material, style, and installation costs. However, casement windows are often the most affordable option.
An example of a casement window (Adobe)
Casement windows are popular and versatile and can be constructed from uPVC, aluminium or timber. They usually feature side-hinged panes that swing either inwards or outwards like a door, but the hinges can also be located at the top or bottom. The bottom-hinged version is particularly safe if you have young children. They can be combined with other window styles, such as fixed, bow, or bay and are the cheapest option for your home.
Casement windows typically include secure multi-point locking mechanisms, while their design provides easy access for cleaning purposes.
Sash windows have been a popular design since the 17th century, particularly in Georgian, Victorian, and Edwardian architecture, and are often used in new constructions to maintain a traditional aesthetic.
Also known as sliding sash or double-hung sash windows, they consist of one or more movable panels that can be slid vertically – or sometimes horizontally – to open or close the window. Often incorporating smaller glass panes divided by bars, sash windows are typically larger than casements.
Sash windows perfectly combine the advantages of modern technology with classic styling. Although timber sashes are the choice of purists, uPVC sash windows are a viable alternative, and many manufacturers produce them.
An example of a tilt and turn window (Adobe)
Tilt and turn windows are a modern design that offers multiple opening options for ventilation and ease of cleaning. They are frequently seen in European countries and are rapidly gaining popularity in the UK.
Tilt and turn designs are typically constructed with multiple locking points, and incorporate a unique hardware system, allowing them to operate in two distinct ways:
They can be made from uPVC, aluminium, or timber and are available in various styles and finishes to suit different architectural preferences.
Bay windows bow outward from the wall of the property, creating additional interior space and adding visual interest to the exterior. They are often seen in residential homes and can enhance both the kerb appeal and the interior living space.
Comprising three or more window panels arranged at angles to each other, bay windows traditionally form a curved or polygonal shape. The most common configuration is a large central window flanked by two smaller angled windows on each side, creating a rectangular bay.
Bay windows are available in uPVC, aluminium, and timber, with a range of colours and finishes. The below table displays average prices for uPVC bay windows.
An example of bow windows (Adobe)
Similar to bay styles, bow windows also protrude outward from the property’s exterior walls. However, unlike bay designs that extend to the ground, bow windows tend to have the window ‘bowing’ out from the wall, with a space underneath. They are characterised by their curved shape, as opposed to the bay’s more angular appearance, with the glass panels arranged in a gentle arc.
Although not sold by some manufacturers, bow windows can be produced in uPVC, timber and aluminium.
Your installer will measure your windows to give you an accurate quote, but doing it yourself will give you an idea of the prices you can expect (Adobe)
Your installer should carry out the measuring process to ensure accuracy and a proper fit. However, knowing how to measure your windows accurately is essential to understand project costs before comparing quotes, ordering new windows online, or thinking about dressings, such as blinds or curtains.
Window measurements are taken in millimetres (mm) and should, if possible, be taken from the exterior of your property.
It’s important to measure the window aperture, rather than the frame, taking the measurement from the edge of the bricks as though the window itself isn’t there.
Here’s a step-by-step guide to measuring your windows:
Don’t assume that all the windows in your home are the same size. Measure each one individually, as there can be slight variations in size, even in seemingly identical windows.
Some suppliers will ask for a 5mm to 10mm deduction from your figures to allow for any natural shifting, so remember to ask if this is necessary.
Double glazing and secondary glazing have two main differences, one being structural and the other being price. Secondary glazing is less expensive than double glazing since it is not as energy-efficient and does not require completely new windows, as double glazing does. Though secondary glazing is less expensive, its energy-efficient counterpart could help save more money on energy bills in the long run.
Double-glazed windows consist of two panes of glass, separated by a spacer bar, with the gap filled with either an insulating gas – usually argon – or air, creating a vacuum. This sealed unit stops the warmth inside your home from transferring to the external pane of glass and prevents condensation between the panes, making it more effective at reducing interior condensation.
Double glazing offers good acoustic insulation, improves your home’s security, and, thanks to the vast choices of materials, styles and colours, can increase the kerb appeal and value of your property.
However, if a unit develops a fault, repairs can be challenging, and may involve replacing the entire window, which can be expensive and time-consuming.
Secondary glazing involves adding an additional pane of glass or acrylic on the interior side of an existing single-glazed window, creating a second layer of insulation. While not as efficient as double glazing, secondary glazing still improves thermal insulation, although the likelihood of condensation is greater.
Generally cheaper than double glazing, secondary glazed window installation is less intrusive, as it doesn’t require replacing the existing windows. This makes it a popular option for listed buildings or homes in conservation areas.
Secondary glazing is less visible from the exterior, maintaining the original appearance of the building. However, it might not be as visually appealing from the inside.
Ultimately, the choice between double and secondary glazing depends on budget, requirements, and aesthetic preferences. Double glazing is generally more effective at improving thermal insulation, while secondary glazing is cheaper and easier to install.
There are some factors that can affect the cost of replacement or additional windows. While there are not many, the factors that could bump up the cost include:
Double glazing windows have an average lifespan of 15 to 20 years, which is typically when homeowners may choose to replace them.
However, there are a few other telltale signs of when they need to be replaced, including:
When comparing window quotes and prices, it’s essential to ensure you’re making an informed decision based on your requirements, preferences, and budget. Begin by researching the available options for materials and styles before you contact any suppliers.
To provide accurate quotes, suppliers – or their sales representatives – will need to book an appointment to visit your home, take measurements and discuss your options.
You should never feel pressured to decide on the spot and certainly shouldn’t sign any contracts without taking time to read the small print. Reputable suppliers will allow you the time to determine whether you want to accept their quotes and move forward with the installation.
Any new windows cost quote should be as detailed and transparent as possible, including all the necessary information to help you make an informed decision.
A quote should include all the relevant details for your project, such as:
If there is any element you are unsure of, or you want clarification on a particular point, make sure you ask before you sign the contract. This allows you to make the best decision on which supplier you want for your windows project.
Replacement windows cost the average UK homeowner between £1,200 and £3,000, though the exact cost will vary depending on your chosen window type and frame material. Different frame materials come with different benefits, and it’s important to consider a balance between price and benefits. As well as carefully choosing the type of double glazing windows to install, the company you choose is just as important; each comes with different prices and product warranties. It’s wise not to rush into your decision and take the time to compare quotes, products and warranties from varying windows companies.
Negotiating a lower price on your new windows can be rewarding if you know the best strategies and are prepared to be patient, persistent, and compromise.
Here are some helpful tips:
The prices for new double-glazed windows have increased in recent years, and this is due to a number of factors. The rising costs of raw materials, manufacturing, transportation, and labour are all reflected in the prices homeowners pay.
Glass, in particular, is experiencing higher production costs, meaning window manufacturers must pay more for the same quantity of glass, while both the pandemic and Brexit have caused significant labour shortages in the UK, impacting on window prices.
Window prices depend on several key factors. The type of windows you have – the style, frame material, and type of glass – will all impact the overall cost.
Surprisingly, where you live in the country may influence the price of your new windows. Access to a large labour force, such as in a city, can keep installation costs down. It may also mean a supplier doesn’t have far to travel for your project, and therefore, has lower transportation costs.
All of these factors will affect the final prices for your new windows.
While there is no financial support specifically for new windows, government grants exist for those wishing to make energy efficient upgrades to their homes. These include double glazing windows, new boilers and insulation.
The ECO4 scheme runs until the end of March 2026 across England, Wales, and Scotland, and is designed to help low-income families living in energy inefficient properties. Several similar options are available, including the Home Energy Scotland Grant and Loan, LA Flex, and HUG2.
Independent Advisor’s team of experts has spent hundreds of hours researching windows, studying their performance and features, customer feedback and costs to help you make an informed decision when it comes to buying new windows. To find out more about our process, read our article on how we cover windows.
Katharine Allison is an experienced writer and researcher who has been producing content for over 10 years. She has worked with some of the UK’s leading companies including Federation of Master Builders, Architectural Digest, and Cuvva Car Insurance. During her time at Positive Agency, she worked with Gordon Ramsay, Denon Construction, Transport for Wales, and Northern Rail, among others. Katharine was also integral in establishing Inner Allies UK as a national mental health charity. Katharine is particularly passionate about consumer causes and animal welfare, and has degrees in art, philosophy, and psychology. She lives with her sled dogs in East Sussex.
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Automatic Door Breakout System This calculator works using pricing data sourced directly from UK windows manufacturers. Prices are subject to fluctuations, however, so please use the results as a guide and contact suppliers for an exact price for your property.