Unplasticised polyvinyl chloride (uPVC) is a popular choice for window and door materials because of its durability, low maintenance, and A-rated energy efficiency.
uPVC is also generally cheaper than aluminium, timber, or steel. Most windows last for around 20 to 35 years, depending on the quality of installation, local climate, and how well you take care of them.
However, if your current uPVC windows are approaching the end of their life, you may consider replacing them to keep your home energy efficient and comfortable.
In this guide, we’re breaking down the cost of new uPVC windows, comparing popular window designs, and exploring factors that affect prices to help you make a more informed decision.
Factors Affecting uPVC Window Replacement Cost
Investing in new uPVC windows can be a worthwhile investment if you’re looking to improve your home’s thermal performance and security. You can also choose a design that better matches the aesthetic you’re going for.
Among the factors that could affect the cost of replacing uPVC windows are the frame style, glazing, window size, and total number of replacements you need.
Frame Style
There are various frame styles for uPVC windows available, and the frame design you pick can enormously affect how much you’re paying.
Complex frame styles, such as bow, sash, and bay windows, are more expensive than casements and tilt-and-turns. This is because they’re harder to manufacture and labour-intensive to install.
A standard, white uPVC frame is usually the cheapest option.
But there are also stylised frames that can add a touch of personalisation, although this will increase the overall price by £50 to £100 per window.
Labour
Installation quality is a key indicator of how long a window will last. Hiring professionals to replace your uPVC windows ensures secure fitting, proper sealing, and weatherproofing for long-term performance.
Labour costs can vary depending on where you live, with daily rates ranging from £250 to £300 for a single installer.
For example, window installation and replacement in London and the South East are generally more expensive than in other areas, sometimes by as much as 20%, mainly due to higher wages and operating costs.
The labour rate may also increase if your windows are difficult to access, such as in vaulted ceilings or lofts. If there are structural issues, you may need to pay extra for repairs.
Some projects might require special permissions, such as in listed buildings, conservation areas, and period properties.
Glass Upgrades
There are specialised glazing options for those with specific window needs.
Acoustic laminated panes are popular for their ability to reduce external noise by up to 30%. Toughened or tempered glass windows are also favoured by homeowners looking for added home security.
Prices for these glazings can add up to £50 to £160 to your replacement bill.
Number and Size
Another obvious factor to consider is the size and number of uPVC windows you want to replace. More windows naturally mean a higher cost, though prices for every window can vary.
That said, having multiple windows replaced at once may reduce your expenses, as installers can spread transport and labour costs for the entire project.
Replacing 2 to 3 windows, for instance, may cost somewhere around £1,500 to £3,000.
A three-bedroom semi with 8 to 10 windows can set you back £4,000 to £9,000. Bigger detached houses could exceed £10,000.
Expect to pay more if your windows are larger, as they’ll require more materials, broader panes, and a longer installation time.
uPVC Window Replacement Cost for Different Frame Styles
In 2026, the average cost for uPVC window replacement ranges from £350 per window for simpler styles to £3,500 for complex frame designs.
Here are the common uPVC window units and their cost.
| uPVC Frame Style | Cost of Replacement per Window |
|---|---|
| Casement Window | £350 to £900 |
| Sash Window | £500 to £1,400 |
| Tilt and Turn Window | £500 to £1,200 |
| Sliding Window | £200 to £1,200 |
| Bay Window | £1,800 to £3,500 |
Casement Window – £350 to £900
Casement windows are some of the most popular upvc window types on the Wirral and across the UK. It’s also often more affordable to replace.
A casement window is hinged at the side of its uPVC frame and swings outward to open. This mechanism allows for better insulation, views, and lighting. They’re widely available and come in single-panel and double-panel types.
You can also find flush casement uPVC windows, characterised by the smooth appearance that doesn’t protrude from the wall.
Because casement units are straightforward to manufacture and install, labour costs are typically lower.
Sash Window – £500 to £1,400
Unlike casement windows that swing outward, sash windows Wirral slide up and down to open. It’s an elegant choice admired for its classic appeal, while still offering excellent energy-efficient benefits.
The unit is composed of two sashes. One is stationary, while the other slides over to open.
uPVC sash windows outperform timber in terms of thermal performance. Still, they’re also about 50% more expensive than casement types and are more costly to replace.
There are heritage-style finishes, woodgrain effects, and stylised detail options that could further increase the price.
Tilt and Turn Window – £500 to £1,200
Many homeowners prefer tilt-and-turn windows for their superior ventilation and security.
Bringing a modern and practical touch, these units can be opened in two ways. You can tilt the upper sash inward for ventilation, or fully open the window like in casements. This makes cleaning easier.
Some designs also allow you to adjust the opening angle, which can be convenient for controlling airflow during rainy weather.
One drawback of tilt-and-turns is that, like casement types, they’re not always ideal for heavy glazing.
Sliding Window – £200 to £1,200
Instead of swinging outward like a casement or swiping up as in a sash, sliding windows slide horizontally to open. They’re less popular in the UK, but are often installed in modern properties, lending a streamlined appearance.
Some benefits of sliding windows include better ventilation and lighting. The straightforward operation makes them practical for daily use.
Fitting a uPVC sliding window costs somewhere between £200 and £1,200, depending on the size and glazing.
Bay Window – £1,800 to £3,500
uPVC bay windows are complex frames that project outward from the property’s wall. The unique design creates impressive panoramic views of the outdoors. The extra space they provide can serve as a cosy reading nook.
Due to their complex construction, bay windows are significantly more labour-intensive to install and replace than other frame styles.
Bay window units usually consist of a massive central window that’s fixed in place. The main pane is then flanked by two smaller glasses, both of which open to let air in.
There are various uPBV bay window frame designs to choose from, including box, angled, and curved, to match your home. Any of these offers top-tier energy performance and noise reduction.
A bow window is similar to a bay window in that it’s made of multiple frames. These units are often curved and have more than three panes.
uPVC Double Glazing vs Triple Glazing Window
The type of glass you use can determine the overall performance of your uPVC window replacement. As such, it’s important to know the difference between a double and triple-glazed unit.
How Much Does uPVC Double Glazing Cost?
Wirral double-glazing uses two panes of glass to increase energy efficiency. The gap between the sheets is filled with a dense gas, such as argon or krypton, serving as a thermal barrier.
A double-glazed uPVC is significantly more affordable than aluminium or timber, costing somewhere around £700 to £1,800 per window, including installation. That’s for common casement units.
How Much Does uPVC Triple Glazing Cost?
A triple-glazed window works similarly to double glazing. But instead of two, three glasses are stacked together to enhance thermal performance.
More barriers mean better insulation, noise reduction, and durability.
These added features increase the price of uPVC triple-glazed units by 30% to 50% compared to double-glazed alternatives.
A triple-glazed uPVC casement window costs roughly £800 to £1,900 to install. A bay window with the same glazing can cost nearly twice as much or more.
Is Triple Glazing Worth the Extra Cost?
So, is triple glazing worth it? While triple glazing certainly comes at a premium, the long-term benefits they provide may be worth the higher initial investment.
Some advantages of triple glazing include:
- Increased security: The stacked panes are sturdier and harder to break from the outside, offering an added layer of security against break-ins.
- Superior insulation: The three layers of panes enhance insulation by 20% to 50% than standard double-glazing windows. This makes them ideal for regions that experience extended cold climates.
- Money-saving potential: Upgrading single-glazed windows to triple glazing can let you save up to £200+ per year on heating bills.
- Enhanced noise reduction: For those living in urban or high-traffic neighbourhoods, triple glazing may be the better choice for keeping indoor noise comfortable.
Another benefit of triple glazing is that it reduces condensation buildup.
If you’re currently experiencing moisture issues coming from your old windows, replacing them with triple-glazed uPVC units may resolve the problem.
When Do You Need to Replace uPVC Windows?
Upgrading windows can improve your home’s comfort, reduce energy bills, and add value to your property. Here are some clear signs that your windows are due for a replacement:
Wear and Tear
Age catches up to anything, even your uPVC windows. Properly installed and maintained units can last well over two decades, but the constant wear and tear will eventually take a toll on their performance.
If you notice signs of rotting, cracking, or warping, it’s high time to invest in an upgrade.
Higher Energy Bills
Did you notice a sudden or gradual increase in your home’s heating bill? This can be a sign that your windows have become inefficient and are allowing more heat to escape.
Check for gaps or damage in the frame. If a particular window area is colder than the rest of the room, there’s a good chance it’s wasting your home’s energy.
Leaks From Windows
This is one of the clearest indicators that you need to replace a window.
Moisture finding its way between the panes or water leaking inside your home means the frame seal or structure has been compromised. In this case, you may need to replace the entire unit to prevent further issues.
Find Top-Quality uPVC Windows Near You
When choosing an installer, always compare multiple quotes to ensure you’re getting your quid’s worth. Look for fitters approved by the Fenestration Self-Assessment Scheme (FENSA) that offer a solid workmanship guarantee.
FAB Home Improvements is a trusted and FENSA-approved window fitter in Wallasey, UK. We offer high-quality replacements for double and triple-glazed uPVC casement, sash, tilt-and-turn, and bay windows.
Get a quote and let us know how we can help improve your home!