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Why get double glazing?

  • Save up to £195 per year on energy bills
  • Improve your property's value
  • Reduce outside noise

uPVC Sash Windows Costs 2024

It costs between £500 and £800 to install one uPVC sash window

It costs roughly £5,500 to install uPVC sash windows in a three-bedroom house

Installing a uPVC sash window can take between a couple of hours to a day

Double glazing costs a pretty penny. But adding it to your home will mean it stays warmer for longer, looks more aesthetically appealing, and is more equipped to prevent break-ins .

If you want the best of both worlds – aesthetically pleasing windows for an affordable price – go for uPVC sash windows. And read about their full costs and benefits in this article.

Want to skip the reading? You can compare the best double glazed windows on the market by popping a few details about your home in our easy-to-use quote tool. We’ll pass on your details to our expert suppliers, who’ll get in touch with you with free bespoke quotes.

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How much do uPVC sash windows cost?

It costs between £500 and £800 to install uPVC sash windows in the UK – but this price will fluctuate depending on the materials used, the size of the windows, and if you’re factoring in double glazing costs.

Although they’ve become more affordable over time, the cost of uPVC sash windows mounts up quite quickly. If you want to see whether you can get double glazing grants to help subsidise the costs, check out our guide.

And to give you a rough idea of how much it’ll cost you to replace all of your windows with uPVC sash windows, check out the table below.

Type of homeNumber of bedroomsWindows neededAverage cost of sash style uPVC windows




£2,400 - £3,200




£3,000 - £4,350




£3,700 - £5,200




£4,400 - £6,600




£6,200 - £7,550




£7,200 - £9,400

Data from Get a Window, January 2023

Want to get a better idea of how much you’ll need to pay for a new set of windows? Use our double glazing cost calculator below to find out.

uPVC sash bay windows cost

There’s no set price when it comes to windows, but bay windows are usually on the most expensive side of the cost spectrum.

Overall, the price of a sash bay window will depend on the number of sections it has. On average, a three-section bay window will cost £1,200, a four-section one will cost £1,650, and a five-section bay window will be closer to £2,150.

Despite the steep price, many homeowners value bay windows because of their aesthetics, as well as their ability to let in more sunlight and airflow – not to mention they increase property value.

uPVC wood effect sash windows cost

Wooden windows are typically more expensive than uPVC ones, which is why some people get uPVC windows with a wood effect – it gives the illusion of a wooden frame at a more affordable price.

If you like the sound of a uPVC sash window with a wood effect, you’ll still have to be willing to pay a little extra. Check out the table below to compare how much more expensive uPVC sash windows are with a wood effect.

Type of sash windowSize of window Average cost

White uPVC

500mm x 500mm


White uPVC

1,000mm x 500mm


Wood effect uPVC

500mm x 500mm


Wood effect uPVC

1,000mm x 500mm


How much can new uPVC sash windows save you?

Paying hundreds of pounds per window mounts up quickly. If you’re having doubts about whether it’s worth it, remember that these home improvements can lead to significant savings on energy bills.

The Energy Saving Trust suggests that homeowners could save £195 per year by installing A-rated double glazed windows in an entirely single-glazed semi-detached gas-heated property. If you go one step further and replace single glazed windows with A++ rated double glazed windows, you could save up to £235 per year.

Did You Know?

Replacing old single glazed windows with double glazing can increase the typical home’s value by an average of 10%.

What type of double glazing do you need?

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A view of a uPVC window on a white wooden building

What factors determine the cost of uPVC sash windows?

There’s no one-size-fits-all when it comes to windows. Generally, the cost of installing uPVC sash windows depends on:

  • The size of the window pane – The bigger the window, the higher the price
  • The style of the window – Installing sash bay windows will be more pricey
  • Any added effects – You might have to pay an extra £100-£150 for a wood effect on a uPVC frame
  • The number of windows being fitted – The more windows, the higher the price
  • The area that you live in – Window installations are usually more expensive in London, compared to the rest of the UK
  • The supplier and installer – Different suppliers and installers charge different rates, which means it’s a good idea to shop around for the best rate before committing to a price
  • Any additional features – Certain types of glass, glazing bars, and specialist sash window locks will increase the price
An infographic that outlines the different factors that affect the cost of double glazing, including the style of the window, the frame material, the company you choose, whether you'll need scaffolding, and the number of windows you want

How long does uPVC sash window installation take?

Installing a uPVC sash window can take anywhere between a couple of hours and a day.

However, like pretty much everything to do with windows, this will depend on a range of factors, including the size and type of window.

The number of installers that are working on the windows will also speed up, or slow down, the installation process. For example, a large window can take up to two hours to install with two professionals working on it, compared to four hours with one person working on it.

Typically, bay windows take the longest to install – expect half a day to a full day – due to their intricate design.

One way you can cut back on costs is to install the double glazing yourself, but we wouldn’t recommend this – you could end up damaging your property and even injuring yourself.

uPVC sash window maintenance costs

uPVC sash windows are very durable, which means they won’t end up costing you an arm and a leg to maintain.

Unlike wooden window frames, uPVC is weatherproof and won’t need annual treatment. However, there might be some wear and tear over time, since sash window panes slide over each other – the movement and friction might lead to some issues.

When it comes to repairing a uPVC sash window, the exact cost will depend on the issue itself. To give you a rough idea of what to expect, we’ve listed some of the most common types of sash window repair costs below.

Repair typeAverage cost

Sill replacement


Sill splice


Stiles/front cheeks


Replacement sash


Draught proofing


Sash window refurbishment


Data from CheckaTrade, 2023

If your sash windows have worn down over time, it might be worth looking into getting them refurbished, rather than repeatedly replacing parts. However, bear in mind that this isn’t a cheap procedure – with the average sash window restoration costing around £770 per window.


Most UK homes are suitable for uPVC sash windows. Upgrading worn-out windows for these visually pleasing ones will increase property value, reduce energy bills, and reduce household emissions.

Think your home could do with a set of sash windows? We can help you there.

Instead of trawling through installers, compare the best double glazing on the market by popping a few details about your home in our easy-to-use quote tool. We’ll pass on your details to our expert suppliers, who’ll get in touch with you with free tailored quotes.

Written by:
Beth has been writing about green tech, the environment, and climate change for over three years now – with her work being featured in publications such as The BBC, Forbes, The Express, Greenpeace, and in multiple academic journals. Whether you're after a new set of solar panels, energy-saving tips, or advice on how to reduce your carbon footprint, she's got you covered.
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