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Our researchers have compiled the latest window prices and interviewing window suppliers to provide you with the latest new windows costs.
New windows cost anywhere between £200 and several thousands of pounds per window depending on the size, style and frame material you opt for.
While these may seem like daunting numbers, a report by the Glass and Glazing Federation (GGF)1 shows that upgrading older windows can reduce heat loss from 44 per cent to 22 per cent. Since lower heat loss means lower energy bills, this translates into hundreds of pounds of savings every year, so installing new windows is a smart investment both for your comfort and for your wallet.
In this guide, our energy saving experts break down the cost of new windows and give you their tips for getting the best deal on your installation. You can also try our free windows cost calculator to get an estimate of how much replacing your windows would cost, and to compare quotes from trusted double glazing installers.
We are committed to publishing reliable window price estimates based on market trends, supplier pricing, and consumer feedback. We want homeowners to feel empowered to make informed decisions, based on transparent insights they can trust.
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To create the most accurate guide on the cost of replacement windows, our team of experts leveraged their years of experience in the home improvement and energy space, conducting hundreds of hours of research to help you make an informed decision regarding window prices.
They also regularly consult a range of credible and authoritative sources in the industry such as installers and manufacturers to ensure the information in this guide is up-to-date.
Perhaps the most important factor that affects the cost of replacement windows is the frame material you choose.
The cheapest windows on the market are uPVC casement windows, which are mass-produced from relatively cheap materials. However, uPVC is not the most durable material: timber windows (the most expensive option) tend to last at least twice as long as uPVC windows do. If you plan to live in the same house for at least 20 years, timber may be a more cost-effective solution despite the higher upfront cost.
It is important to note, however, that if you choose timber frames, they will need regular maintenance, whether you do it yourself or pay a professional. uPVC and aluminium windows, on the other hand, usually require very little upkeep.
You can also opt for heritage window frames and frames made from premium materials such as steel, but they will cost significantly more. Finally, you have composite windows, which use a mix of materials such as uPVC and aluminium to balance quality and affordability.
White uPVC casement frames are a popular and affordable option among UK homeowners. Window prices start at around £200 per frame for a basic design. A wide variety of styles, finishes and even coloured uPVC windows are available.
uPVC frames are also good at insulating homes, working to reduce heat loss in winter and limit heat gain in summer. As a result, your home should feel more comfortable year-round, and you may even see a reduction in your energy bills. uPVC frames need only minimal maintenance, such as occasional cleaning with soap and water or a cleaning spray. Moreover, these window frames should last more than 20 years. Being resistant to moisture, rot and UV damage means uPVC frames shouldn’t fade, crack or warp during their lifespan.
| Casement window frame material | 600mm x 900mm | 900mm x 1,200mm | 1,200mm x 1,200mm |
|---|---|---|---|
| uPVC | £525 | £615 | £670 |
Aluminium windows start at around £350 all the way to over £1,000 for larger, more complex designs, so they’re more expensive than uPVC frames. That said, these metal windows are generally more affordable than higher-end options such as timber or steel.
Aluminium’s high strength-to-weight ratio means that your window frames can be thinner, allowing more natural light to pass through compared to windows made from other materials. Like uPVC, aluminium is resistant to rusting and warping and doesn’t require much maintenance, and one of the biggest advantages of aluminium frames is their 45-year lifespan.
Despite their many advantages, however, aluminium windows have poorer energy efficiency than windows with uPVC or timber frames. Aluminium is a thermal conductor, meaning heat can transfer heat between indoors and outdoors more easily. As a result, indoor temperatures may be less comfortable, and your energy bills may increase. However, manufacturers often integrate thermal breaks (materials that reduce heat transfer) into aluminium window frames to improve insulation.
| Casement window frame material | 600mm x 900mm | 900mm x 1,200mm | 1,200mm x 1,200mm |
|---|---|---|---|
| Aluminium | £700 | £800 | £870 |
Replacing windows with timber-framed designs is the most expensive option, starting at around £1,000 per window for a basic design. The long-term cost of timber will also be higher than aluminium and uPVC because of the upkeep required to keep them in shape, such as repainting and oiling.
Despite the high costs, timber frames do have advantages. For example, they’re stronger and have better thermal insulation than uPVC. Timber frames also have aesthetic appeal, especially if you own a period home designed with timber frames in mind. Last but not least, they can last twice as long as uPVC frames if maintained properly. Depending on the style of your property and your long-term plans, timber window frames may be more cost-effective in the long run, even considering the higher initial costs.
| Casement window frame material | 600mm x 900mm | 900mm x 1,200mm | 1,200mm x 1,200mm |
|---|---|---|---|
| Timber | £1,630 | £1,850 | £1,975 |
While they tend to last longer than uPVC windows, wooden window frames are prone to deterioration from adverse weather and natural wear-and-tear. Despite this, are they worth the investment? Let’s break it down.
Depending on the type of wood you opt for, we recommend repairing, repainting or revarnishing your windows every 1 to 5 years to keep your frames in good condition. If you prefer DIY maintenance, the required materials should cost about £100, and depending on the extent of the work needed, it should take 2 to 6 hours on each window.
This means that considering longevity and maintenance, a wooden window frame is only £96 more on average than a uPVC window frame.
The cost of new windows is also determined by the style of window you choose, which in turn is set by your personal taste, practical requirements and the house’s architecture.
Casement windows – which are attached to the frame by a hinge on one side – are affordable, functional and versatile, making them a popular choice for many UK homeowners. However, this type of window doesn’t suit every property. For example, bay windows are a more natural fit for cottages, while sash windows tend to better suit Edwardian or Georgian properties.
Below, we break down cost estimates for each window style so you can make an informed decision about your window replacement.
Casement windows offer excellent ventilation and are versatile and easy to use. They also tend to be the cheapest style you could opt for.
With a hinge on one side, casement windows open outwards using a crank or lever. French-style casement windows do not have a central post, offering an unobstructed view when open, but that central post does create a tight seal when closed, making a property more energy efficient and secure.
When purchasing casement windows, you can choose between uPVC, aluminium or timber frames, and manufacturers can tailor the windows to match your preferences with various finishes, colours and hardware. Many casement designs also incorporate glazing bars called astragals, which give the impression of individual glass panes mimicking the traditional cottage windows. Casement windows can be customised to suit a homeowner’s tastes, including adding premium design features such as stained glass.
Although casement windows are affordable, versatile and effective, they won’t be the best fit for every property. For example, sash or bay windows may better suit period or heritage style homes. It’s also important to consider whether an outward-opening window could cause an obstruction or pose a safety hazard around your property.
| Casement window frame material | 600mm x 900mm | 900mm x 1,200mm | 1,200mm x 1,200mm |
|---|---|---|---|
| uPVC | £525 | £615 | £670 |
| Aluminium | £700 | £800 | £870 |
| Timber | £1,630 | £1,850 | £1,975 |
Sash windows, sometimes called hung sash windows or sliding windows, date back to the late 1600s. Sash windows incorporate 1 or more movable panels – called sashes – and use counterweights to slide vertically (in single- or double-hung sash windows) or horizontally within the window frame (in sliding sash windows). A well-maintained sash window has a smooth opening and closing action and is practical and attractive.
Most Georgian, Victorian and Edwardian properties have sash windows, but there are now modern double glazed options which have grown popular in contemporary UK homes. Double glazing provides good thermal insulation and needs relatively little upkeep.
You can often tell the age of a historic property by the number of panes in its sash windows. For example, sash windows in Georgian homes tend to feature 6-over-6 configurations, while Victorian terraces typically have 1-over-1 sash designs.
Sash windows are usually available in uPVC and timber frames, with a range of colours to choose from.
| Sash window frame material | 600mm x 900mm | 900mm x 1,200mm |
|---|---|---|
| uPVC | £805 | £915 |
| Timber | £2,450 | £2,775 |
Bay windows project outwards from your property, creating a recess or bay on the inside. This outward projection lets you see more of the outside and maximises natural lighting. The stylish appearance and overall practicality of bay windows have kept this window style popular among UK homeowners.
A whole bay window usually comprises 3 or more window panels joined at angles to form a trapezium shape. The largest window panel is typically the central one, which runs parallel to the main wall of the building. The flankers – or side windows – are connected to the central one at various angles (generally 30, 45 or 90 degrees) depending on the house’s architectural style and the homeowner’s preferences.
You can also purchase double glazed bay windows with several frame materials – including uPVC, aluminium and timber – and in multiple styles and configurations. As bay windows do not have standard sizing, it’s difficult to estimate an average price. However, a general rule of thumb is to add £75 per panel to cover the connecting struts. The table below gives some sample costs.
| Bay window frame material | 1,016mm x 914mm | 3,200mm x 1,980mm |
|---|---|---|
| uPVC | £1,755 | £2,890 |
| Aluminium | £2,265 | £3,735 |
| Timber | £5,265 | £8,675 |
Like bay windows, bow windows expand outwards from the walls of your home, increasing the amount of interior space and natural light you benefit from. The main difference with bay windows lies in their shape and configuration.
As their name suggests, bow windows form an arc usually made with 4 or more window panels. Bow windows give an attractive curved appearance on the outside of a home and create a rounded nook or alcove on the inside. A bow window’s panels are usually equal in size and are either openable (if fitted with casement or double-hung windows) or fixed.
Bow windows do not come in standard sizes, as they depend on customer specifications. The number of casement panels you request will affect the cost, and you should also budget for an additional £75 per panel to cover the connecting struts and poles. The table below provides price estimates based on material and window size.
| Bow window frame material | 1,016mm x 914mm | 3,200mm x 1,980mm |
|---|---|---|
| uPVC | £1,815 | £2,890 |
| Aluminium | £2,265 | £3,860 |
| Timber | £5,435 | £8,960 |
Tilt and turn windows are versatile and modern, so their popularity is growing across the UK. Their flexible hinge system means they can open outwards like a casement window or tilt inwards and pivot from different points. The tilting option allows you to ventilate your home without compromising on security and is safer for households with young children or pets.
Double glazed tilt and turn windows are energy efficient and usually require minimal maintenance. They are available in various frame materials including uPVC, aluminium and timber.
| Tilt and turn window frame material | 800mm x 800mm | 1,000mm x 1,000mm | 1,200mm x 1,200mm |
|---|---|---|---|
| uPVC | £670 | £760 | £835 |
| Aluminium | £875 | £1,000 | £1,085 |
| Timber | £2,040 | £2,310 | £2,515 |
Listed and heritage properties are considered to have historical importance, so any upgrades to them must preserve their original character and appearance. As a result, there can be additional costs when replacing windows in these properties. Expenses such as applying for permission, soliciting input from architects and paying for specialist installers could increase the cost of replacement windows on period properties.
If your property is listed, you must get the necessary permissions from your local planning authority before beginning repair or renovation work. Any changes that might affect the appearance of a listed property or building of special architectural or historic interest will need Listed Building Consent. Your local authority will cover the cost of obtaining this.
We’d recommend meeting with architects or surveyors as early as possible in the planning process, as they can help you navigate the regulatory landscape. Looking into the specific regulations and guidelines about your property set out by heritage bodies such as Historic England, Historic Environment Scotland, Cadw in Wales or the Northern Ireland Environment Agency can also be helpful. These authorities provide valuable guidance on the maintenance and renovation of listed buildings.
It’s often easier to repair the existing windows on listed properties than it is to replace them. However, if the windows are damaged beyond repair – due to extensive rot or decay, for example – it makes sense to look into replacing them.
In cases where a previous replacement window installation has compromised the property’s historic character by using inappropriate materials or designs, proposing a return to the original window style could be a legitimate basis for replacement too.
Keep in mind that it can take up to 13 weeks for a local authority to process applications for large-scale projects, although most aim to make a decision on smaller proposals within 2 months.
You can design and submit your own detailed drawings to the planning department, but it’s more common to engage a professional architect, which may cost between £900 and £1,500. Depending on the project, additional costs may apply, such as:
Below, we outline the main pros and cos of each type of window glazing so you can make an informed decision about which is right for your home.
Double glazing is a popular and cost-effective solution for improving energy efficiency and comfort in homes. It consists of 2 panes of glass with a gap filled with insulating gas, which reduces heat transfer, leading to lower energy bills. Double glazing is widely used across the UK, providing a good balance between cost and performance, particularly for homes in moderate climates.
One of the main advantages of double glazing is its affordability compared to triple glazing. While it offers less insulation than triple glazing, it is typically 10 to 20 per cent cheaper. Double glazing is also lighter than triple glazing, meaning it usually doesn’t require structural reinforcements to window frames, further keeping costs down.
Here are some of the many benefits of double glazing:
Triple glazing consists of 3 panes of glass with 2 insulating gas-filled spaces, offering superior insulation to double glazing. Its main advantage is better energy efficiency, which can help reduce heating costs, especially in colder climates, and reduced noise.
Once rarely seen, triple glazed windows are becoming more popular across the UK, in part because of the UK Government’s Future Homes Standard project. From 2025, new builds must produce 75 to 80 per cent fewer carbon emissions than homes built under current regulations; with these stricter energy efficiency standards, triple glazing will likely become common in new constructions.
Triple glazed windows offer several advantages over double glazing, such as:
It’s worth noting, though, that triple glazing tends to be more expensive than double glazing, which can add up substantially in a whole-house installation. However, some suppliers offer free triple glazed upgrades if you’re planning on replacing your windows.
The extra weight of triple glazing also requires stronger window frames, which can lead to additional structural costs if your property isn’t suited to carrying heavier units. Repairs and replacements can also be more complicated and expensive than double glazing due to their intricate design.
Secondary glazing involves adding a second layer of glass or plastic to an existing window, offering a cost effective way to improve insulation and soundproofing without replacing the original windows. This method is particularly appealing for homeowners looking to reduce energy bills and noise without the higher upfront costs of double or triple glazing windows.
Secondary glazing is less efficient than double glazing, but it has several advantages:
Of course, if you’re considering installing secondary glazing, you should be aware of the disadvantages:
We recommend you take the time to get multiple quotes from various suppliers and installers, as this will ensure you get the best value on your replacement windows. Any quote for new double glazing should be detailed and easy to understand. Below is a list of factors we think you should consider when we assessing a double glazing quote:
We spoke to Richard Tincknell, who has worked for window installer Britannia Group for over 30 years.
He told us that in his experience, some less reputable double glazing companies advertise impossibly low prices on their websites to attract customers, and the result can be shoddy work which needs replacing. He has also frequently seen other companies place pressure on people to agree to their quotes by offering time-limited deals.
So, how do you go about finding a good installer? According to Tincknell, great communication, time spent on understanding your needs and the absence of pushy sales techniques are all green flags.
He also highlighted that some installers use computer software to demonstrate how a particular window will look in your home, ensuring you are satisfied with the design and the quote before you commit. Since the choice of style, frame materials, colour and window furniture affects the final price, such technology allows you to easily adjust your order according to your preference and budget.
As the buyer, you have the right to negotiate with a window installer before you accept the quote.
However, some windows companies are more receptive to haggling than others. As a rule, the bigger and more expensive your planned installation, the more incentive the installer has to decrease its cost.
Obtaining multiple quotes is the best way to effectively lower window prices. That way, you can politely point out that an alternative provider has offered a better price on a certain item or service. Even if the company is reluctant to lower its price, it might be willing to sweeten the deal by offering better terms or upgrading certain components.
You can justify the cost of replacing windows if you start to experience any of the following issues:
As a rough guide, double glazed windows typically last upwards of 20 years, depending on the type and quality of the materials used as well as their maintenance.
| Window material | Average lifespan |
|---|---|
| uPVC | 25 years |
| Aluminium | 45 years |
| Timber | At least 50 years |
Regular maintenance such as cleaning the frames, lubricating hinges and checking for any signs of wear can significantly extend the lifespan of your windows. Environmental conditions also play a role in their longevity; windows exposed to extreme weather, such as heavy rainfall, strong winds or intense sunlight may deteriorate faster. By staying proactive with maintenance and addressing minor issues early, you can maximise the performance and lifespan of your windows, regardless of the environmental conditions they face.
To ensure a proper fit and prevent installation issues, accurate measurements are essential. Always measure the aperture – the opening in the wall for the window – rather than the window itself. If possible and safe to do so, it’s helpful to measure on the outside of the building as well.
Always check your measurements twice to ensure accuracy. If you’re not confident about your own measurements or how to approach the process, ask an experienced window installer to do it for you. Most professionals will check your measurements before confirming a quote and will conduct an on-site visit before beginning the installation.
Considering new windows can significantly reduce your energy bills and increase your home’s energy efficiency, we think they’re a viable investment, especially if you’re intending on staying in your home for a long time. However, the costs are high enough to warrant careful consideration.
Our key takeaway is that there are window prices to suit most homeowners’ budgets, starting from around £500 per window for a uPVC casement window and rising to £8,400 for a large, timber-framed bay window.
The best way to ensure you’re getting a fair price for your window installation is to obtain multiple quotes from different installers and compare them. You may be able to bring the price down slightly by pointing out that a competitor is offering a better deal, but that’s not a guarantee.
uPVC casement windows are still the cheapest combination of material and style that you can choose to replace your double glazing in 2026. The cost per window starts at around £500, without the cost of installation.
Investing in premium windows can be worthwhile if the benefits, such as increased energy efficiency and soundproofing, match your needs. However, you should balance these advantages with your budget to find the best option for your home.
While there are currently no specific windows grants available in the UK, you could qualify for funding through various programmes aimed at improving energy efficiency and reducing household heating costs. Such initiatives include the ECO4 grant, which provides partially funded (in some cases, even free) replacement windows to eligible low-income households.
Replacing 20-year-old windows with modern double glazing boosts your property’s energy efficiency and reduces your heating bills. It also enhances your home’s appearance, value and comfort. New windows offer better insulation and upgraded security, noise reduction and UV protection, making them a worthwhile investment if you have the budget.
Some window installers now offer a windows scrappage scheme to encourage homeowners to replace their old, inefficient windows with modern, energy-efficient alternatives. For example, when you recycle your old windows, Anglian offers an average of £1,000 off the cost of new ones.
It is more efficient to replace all your windows at once, as this often earns you a bulk discount and minimises disruptions. However, if you’re on a budget, you could consider starting by upgrading high-wear windows like street-facing ones to improve energy efficiency and noise reduction while boosting kerb appeal.
From the VELUX website, it costs around £980 to replace a roof window, assuming a like-for-like switch. However, this price will be higher if you wish to install a larger window or add a new window to a space that doesn’t already have one. Installers’ rates will also vary depending on the labour and materials required, so this price is only an indication.
[1]Window of Opportunity report, Glass and Glazing Federation, 2022.