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How much do new windows cost? Replacement window prices in the UK 2024

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The average cost of replacement windows for a three-bedroom house in the UK is £4,000.

uPVC is the cheapest type of frame material, at around £500 for a casement window.

The cost of double glazed windows is determined by the number you need to install, the chosen frame material and the window design.

Replacement windows can cost around £4,000 for a semi-detached three-bedroom house, depending on factors such as the material used. However, double glazing can save you up to £260 per year – that’s around 20 per cent off the average heating bill, making the investment well worth it. The savings are even more significant with triple glazing, with some manufacturers claiming reductions of 50 per cent, but they do tend to cost more than their double glazing counterparts.

Here, we’ll cover the choices of styles, designs and materials you’ll have for your new windows and assess how they impact the price you’ll pay. Our experts also explain the ideal time to replace your existing windows, how to measure up, and how to get the best new window quotes.

Independent Advisor recommends that to get an accurate quote, access to the property is required.

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How much do new windows cost?

To help you understand the cost of replacement windows, we’ve provided average costs for double glazing a three-bedroom home with eight windows. We’ve calculated prices across various styles and frame materials. As prices can vary depending on window sizes and your chosen installer, we recommend getting quotes from several installers. You can use this form to get free quotes.

Windows prices based on style and material

Window typeMaterialAverage cost per windowAverage cost for three-bedroom house
CasementAluminium £1,054£8,400
Bow/BayAluminium £3,400£27,200

Our methodology around windows prices

data points measured
types and materials considered
experts consulted
hours of research
customer reviews read

Our 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 see more about our process, find out how we cover windows.

What are the most affordable window frame materials?

When it comes to window prices, uPVC (unplasticised polyvinyl chloride) is the most cost-effective of all the available frame materials.

uPVC windows are a popular choice for residential properties thanks to their durability, low maintenance and cost-effectiveness. uPVC is a viable alternative to the more traditional timber and aluminium frame materials.

uPVC windows prices

Casement window frame material600mm x 900mm900mm x 1,200mm1,200mm x 1,200mm

Typically, double glazed uPVC windows have excellent insulation properties and help 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 customise their homes according to their taste. Some manufacturers even offer uPVC that mimics the look of timber, giving homeowners the best of both worlds.

Aluminium windows prices

Casement window frame material600mm x 900mm900mm x 1,200mm1,200mm x 1,200mm

While less popular than uPVC, aluminium windows tend to have a slimmer profile, allowing for bigger panes of glass and more natural light in your home. This is because aluminium is a stronger material, but 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 their best, and come in a choice of colours to match the aesthetics of your home.  

Aluminium window prices usually cost around double the price of uPVC windows.

Timber windows prices

Casement window frame material600mm x 900mm900mm x 1,200mm1,200mm x 1,200mm

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 cost around three times the price of uPVC windows, 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 also well-suited for older or period properties and homeowners who prefer the look and feel of natural materials.


How to reduce the cost of replacement windows – Mark McCluggage, Director at Sheerwater Glass

Reduce installation costs by prioritising draughty windows. While installing a complete set of new windows is more cost-effective due to reduced labour and material costs, upgrading the most problematic windows keeps prices down when budget is an issue. These could include single glazing, leaky units, damaged, or front-facing windows.


Double glazing can save between £235 and £260 annually, with the biggest savings occurring over winter. The initial investment may take a few years to repay through increased savings; however, aspects like draught-proofing and insulation will instantly show significant improvements.

Which is the most affordable style of window?

Casement designs are often the most affordable window style, especially when made of uPVC, with bay and bow windows being the most expensive, as they are harder to install and manufacture.

window styles graphic
Larger, more complex window styles generally cost more (Independent Advisor)

Casement windows prices

Casement frame material600mm x 900mm900mm x 1,200mm1,200mm x 1,200mm
Windows prices casement windows
Casement windows are the most popular type and are usually the cheapest option (Adobe)

Casement windows are the most affordable types of windows, with prices ranging from £527 to £650 each for uPVC. They can be constructed from uPVC, aluminium or timber, with the latter being the most expensive. They usually feature side-hinged panes that open outwards, but can be found in bottom-hinged configurations – which are the safer option for households with young children – or top-hinged.

Sash windows prices

Sash window frame material600mm x 900mm900mm x 1,200mm
When replacing a sash window, it is important to get the style of the sashes correct – Victorian, Georgian and Edwardian homes all have different numbers of panes within the sash. (Adobe)

Sash windows are often found on period properties, but can be installed in new builds to mimic traditional architecture. They cost between £1,100 and £3,200 on average, with the cost of uPVC sash windows being the most affordable. 

Sash windows combine the advantages of modern technology with classic styling, consisting of one or more movable panels that can be slid vertically – or sometimes horizontally – to open or close. 

Few manufacturers produce aluminium sash windows, meaning you generally only have a choice between uPVC and timber, with the latter having a high initial outlay but the potential to last much longer than uPVC, if properly maintained.

Tilt and turn windows prices

Tilt and turn frame material600mm x 900mm900mm x 1,200mm1,400mm x 1,400mm
Windows prices tilt and turn windows
Tilt and turn windows are popular with families with young children because they offer ventilation from the top, making them safer (Adobe)

Tilt and turn windows cost between £512 and £990 each, offering a modern design with multiple opening options for ventilation and ease of cleaning. Despite costing more than casement windows, they are growing in popularity in the UK thanks to their flexibility in terms of material. 

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:

  • Tilt function: turning the handle to the first position allows the window to be tilted inward from the bottom, creating a small opening for ventilation at the top 
  • Turn function: turning the handle to the second position means that the window can be swung inward like a door, with the side hinge as the pivot point

They can be made from uPVC, aluminium, or timber, and are available in various styles and finishes to suit different architectural preferences and budgets.

Bay windows prices

Bay window frame material1,016mm x 914mm3,200mm x 1,980mm
Bay windows often have three panels, but can have as many as six. (Adobe)

Bay windows are one of the most expensive window styles on the market, with the cost of installation sitting between £1,700 and £8,400. Bay windows bow outward from the property, creating additional interior space and adding visual interest to the exterior. 

​​Comprising three or more window panels arranged at angles, 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. 

Since bay configurations are more intensive to install and require more materials, the cost of bay windows is usually more expensive than casement or tilt and turn window frames. They are, however, available in uPVC, aluminium and timber, with a range of different finishes and colours that can help bring down the cost of replacing windows. 

Bow windows prices

Bow window frame material1,016mm x 914mm3,200mm x 1,980mm
Bow windows prices
An example of bow windows (Adobe)

Similar to bay windows, bow windows protrude from the property and require more materials to install, resulting in a high outlay of between £1,700 and £8,400 for replacement windows. 

Unlike bay designs, bow windows extend from the wall, rather than the ground. 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, with the former being the cheapest option. 

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How to measure your windows to understand project costs

Your installer will take detailed window measurements, but knowing how to measure your windows yourself should help you get a rough idea of project costs before comparing quotes, ordering new windows online, or thinking about dressings, such as blinds or curtains.  

Window measurements are given in millimetres (mm) and should, if possible, be taken from the exterior of your property. It’s essential to measure the window aperture (the hole in your wall the window frame sits in) rather than the frame, taking the measurements from the edges of the bricks.

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.

Here’s a step-by-step guide to measuring your windows:

The information in this video is also available as a text transcript.

New window costs compared: double glazing vs secondary glazing vs triple glazing

Double glazing and secondary glazing have two main differences: structure and 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 cheaper, its energy-efficient counterpart could help save more money on energy bills in the long run.

Double glazing

Windows prices double glazing example
Double glazing uses two panes of glass and a layer of gas or air for added insulation (Adobe)

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 effective noise reduction, improves your home’s security and, thanks to the vast choices in 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

Windows prices secondary glazing example
Secondary glazing is typically cheaper than double glazing but doesn’t provide the same energy bill saving (Adobe)

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 also makes it a popular option for listed buildings or homes in conservation areas where replacing old windows with double glazing is restricted by planning laws.

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.

Triple glazing

Windows prices triple glazing example
Triple glazing provides better insulation than double glazing, but costs around 20 per cent more (Adobe)

Triple glazing offers improved energy efficiency when compared with double glazing. Much like double glazing, which features two panes and one gas gap, triple glazed windows are built using three panes and two gaps. This allows the windows to better regulate indoor temperatures, keeping homes cool in the summer and warm in the winter.

Triple glazing historically had a reputation for being vastly more expensive than double glazing, but in recent years, triple glazing prices have come down to around 10 to 20 per cent more than double glazing, while some companies offer a triple glazing upgrade for the same price as double glazed windows.

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Extra factors to think about when budgeting for window replacement costs

There are some factors that can affect the cost of new windows. While there are not many, the factors that could bump up the cost include: 

  • Insulation: should your home require additional insulation when installing replacement windows, this will inevitably increase the cost
  • Location: windows that are not on the ground floor level require scaffolding to provide the installer with safe access, and this increases the cost
  • Home age: older homes pose two different potential cost increases; manufacturing and labour costs may be higher if the house has non-standard window sizes, and a home with structural issues due to house age can also make installation more expensive
  • Additional construction costs: if there’s any additional work required around the opening for your new windows, such as widening or narrowing the opening for a different frame size or repairing brickwork, this will increase the overall cost and may also add time to your installation schedule

Labour costs

Typically, double glazing is fitted by a team of two installers. The daily cost for their services averages about £500, with an hourly rate of between £25 and £35 per person. The day rate for a single installer ranges from £200 to £280.


Installing one window can take up to three hours, barring complications, while fitting replacement windows in a whole property varies based on their number, type and size.


The labour costs can vary depending on the region, with London and the South East generally commanding higher prices than other parts of the country.

How do you know when it’s time to replace your windows?

Double glazing windows have an average lifespan of 15 to 20 years, which is typically when homeowners choose to replace them. 

However, there are a few other telltale signs of when they need to be replaced, including: 

  • Condensation droplets in between the window’s panes
  • Difficulty opening, closing, or locking your windows
  • Draughts from your windows, which could result in heat loss and higher energy bills
  • Lack of sound insulation
  • Noticeably higher energy bills
  • Noticeable damage to frames or window seals, as well as warping or rotting frames

Comparing window quotes and prices

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 double glazing companies.

  • If you know anyone who’s had new windows installed, asking them for recommendations gives you a good place to start
  • Research the reputation of any company, reading customer reviews to ensure they have a history of quality work and good customer service. You may be willing to pay a little more for a company with a better track record
  • Consider the labour costs for installation, as well as any extra fees for removing and disposing of your old windows. Some quotes may not include these additional costs, so make sure you have a clear understanding of the total price
  • Make sure the company is registered with the Fenestration Self-Assessment Scheme (FENSA) or the Glass and Glazing Federation (GGF)
  • Check the warranty coverage for both the windows themselves and the installation. A longer warranty period with comprehensive coverage can save you headaches and money in the long run

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. 

Keep in mind that most window companies make windows to order, using the exact measurements taken during your initial appointment. Although off-the-shelf window units are available, they are unlikely to fit your property exactly, resulting in issues such as draughts, dampness, and a reduced lifespan for your windows. Using a professional installer avoids these problems.

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 like Anglian will allow you the time to determine whether you want to accept their quotes and move forward with the installation.

Beware of window quotes that are too cheap

While it’s always enticing to opt for the most cost-effective solution, quotes that seem too good to be true may raise red flags. 

Overly cheap new window quotes can sometimes indicate inferior quality materials, inexperienced installers, or corners being cut during the installation process. These compromises can result in poor insulation, reduced durability, and potential issues like condensation between panes. Instead of long-term energy savings and comfort, you might face unexpected repair bills or premature replacements. It’s imperative to strike a balance between cost and quality. 

Researching, asking the right questions, and comparing quotes from reputable companies can help ensure your investment in replacement windows is both sound and beneficial in the long run.


Find the best windows quote – Mark McCluggage, Director at Sheerwater Glass

Find the best deal. Most double glazing companies produce tailored quotes since everything from the window style to the lock choice affects the final price. As a result, it’s worth getting quotes from various companies to see who has the best deal, giving homeowners more flexibility regarding haggling.


Check that your installer is FENSA or Certass registered. A FENSA or Certass certificate ensures that new installations comply with relevant building regulations and are registered with the local council – essential when selling a home. They also offer protection for the homeowner in the event of a problem.

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What should a quote for new windows include?

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:

  • Window type and specifications: the quote should clearly mention the type of windows – for example casement, sash,or bay – as well as:
    • The materials used (eg, uPVC, wood, or aluminium)
    • The specifications, such as size, colour, and finish
  • Glazing: the type of glazing being used, such as double or triple glazing, and any additional features (eg, noise reduction or UV protection) should be specified
  • Energy efficiency: the quote should include information on the windows’ energy efficiency rating
  • Hardware and accessories: any hardware and accessories, such as handles, locks, and hinges, along with their finishes and styles, should also be listed, particularly if they add to your final cost
  • Timeframe: the quote must include an estimated timeline for the project, detailing when the windows will be delivered and installed
  • Installation costs: a detailed breakdown of labour costs for installing the new windows should be provided, as well as any additional fees for removing and disposing of your old windows
  • Total cost: the quote should provide a clear breakdown of all costs, including materials, labour, and any additional services, along with the total price for the project
  • Payment terms: the quote needs to specify the payment terms, including any required deposit, payment schedule, and accepted payment method
  • Warranty information: the quote should provide information on the warranty coverage for both the windows themselves and the installation work
  • Company details: the quote should include the company’s contact information and its relevant insurance coverage

If there’s any element you’re 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 around £4,000, though the exact cost will vary depending on your chosen window type and frame material. Individual frame materials offer different advantages, 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; prices and product warranties all differ. It’s wise not to rush into your decision and take the time to compare quotes, products and warranties from varying windows companies.

New window prices FAQs

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:

  • Research the market: look online at different window suppliers, comparing their products, prices, and customer reviews
  • Understand your requirements: calculate how many windows you need, and the styles and frame materials you prefer
  • Establish a budget: decide on your available budget and try to stick to it
  • Get multiple quotes: request quotes from at least three different windows suppliers
  • Be prepared to walk away: let the suppliers know that you’re comparing prices and are willing to walk away if you can’t negotiate the right deal
  • Ask for discounts: suppliers often have special offers, and many give discounts if you buy a certain number of windows or order other products, such as doors, alongside your windows
  • Offer to pay upfront: if you can, paying upfront for the project may encourage the supplier to offer a discount
  • Be flexible with your schedule: if you can accommodate the supplier’s preferred installation dates, they may be more inclined to offer a better deal

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. There are certain government grants for windows that can reduce the cost of new windows for homeowners that meet a certain criteria.

Yes, it’s more cost-effective to replace all your windows at once. Completing your windows installation in one go and not in stages can reduce material costs and you’ll save money on labour. Replacing all of your windows at once will also improve your home’s energy efficiency. Windows are the main source of heat loss in a home, and a window’s efficiency declines over time, meaning an increase in energy bills.

Yes, the colour of your windows can affect the overall price. For example, standard white uPVC windows are the most affordable type of windows. But when you change the colour or finish, the cost can increase – grey uPVC windows can cost around 10 per cent more than white uPVC windows, for instance. Similarly, if you opt for wood grain finish, your total cost will be around 10 to 15 per cent higher than white windows.

Investing in premium windows can be cost-effective over time due to superior energy efficiency, reducing heating and cooling expenses. These windows often feature enhancements such as triple glazing, noise reduction, and low-emissivity coatings, which help minimise heat loss. Available in diverse colours, styles, and durable materials like timber, these windows offer long-term value with added benefits, including customisation options and better insulation. 

Nonetheless, it’s crucial to weigh these advantages against your budget and needs to make an informed choice.

Windows cost calculator

See how much it would cost to get new windows for your home.

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.

Katharine Allison

Energy Saving Writer

As Independent Advisor’s energy saving expert, Katharine, a keen advocate for sustainability, is an authority on solar panels, double glazing, and cutting-edge renewable energy technologies. Her dedication merges with a commitment to enlighten and steer readers toward embracing eco-friendly solutions and the latest trends in sustainability.

With over 10 years of experience, she has worked with some of the UK’s leading companies and publications, including the Federation of Master Builders, Architectural Digest, and Denon Construction. 

Katharine is particularly passionate about consumer causes and animal welfare and has art, philosophy, and psychology degrees. She lives with her sled dogs in East Sussex.