COST GUIDES
uPVC sliding sash windows prices 2026
Updated 07/26
Fast Facts
Typical cost: £520–£800 per window, including supply and fitting
Biggest cost drivers: Window size, finish and glazing specification
Compliance: Choose a FENSA or CERTASS registered installer to ensure your installation complies with building regulations
uPVC sliding sash windows combine the traditional appearance of period sash windows with the durability, energy efficiency and low maintenance of modern uPVC.
They're a popular choice if you're replacing older timber sash windows, renovating a period-style property or simply want the classic sash window look without the ongoing upkeep.
This guide explains typical uPVC sliding sash window prices, compares them with timber alternatives and the factors that affect the overall cost.
uPVC sliding sash window prices
Most homeowners pay between £520 and £800 per window, including supply and installation.
The final price depends on the size of the window, the finish you choose and whether you're replacing an existing window or creating a new opening.
| Window type | Unit | Range - Low | Range - High | Average cost |
|---|---|---|---|---|
| White uPVC sliding sash window (500mm × 500mm) | Supply & fit | £520 | £625 | £600 |
| White uPVC sliding sash window (1000mm × 500mm) | Supply & fit | £600 | £720 | £700 |
| Wood-effect uPVC sliding sash window (500mm × 500mm) | Supply & fit | £625 | £720 | £700 |
| Wood-effect uPVC sliding sash window (1000mm × 500mm) | Supply & fit | £700 | £800 | £750 |
| Timber sash window (600mm × 900mm) | Supply & fit | £1,400 | £1,580 | £1,490 |
| Timber sash window (1200mm × 1200mm) | Supply & fit | £1,500 | £1,800 | £1,650 |
| Last updated: July 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||||
These figures generally include both supply and installation. Scaffolding, upgraded hardware, specialist glazing and VAT may be charged separately, so always check exactly what's included before accepting a quote.
Compare quotes from checked window fitters
The easiest way to find the right price for your project is to compare quotes from a selection of checked window fitters working in your area.
When requesting quotes, let each installer know the size of your existing windows, the finish you'd like and whether you're replacing existing windows or installing new ones. The more information you provide, the more accurate your quote is likely to be.
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What affects the cost of uPVC sliding sash windows?
The cost of uPVC sliding sash windows depends on whether you're replacing a like-for-like window or cutting a new opening, the size of the window, and the finish you choose.
Window size: Larger windows require more materials and generally take longer to install, increasing the overall cost
Finish: Standard white uPVC is usually the most affordable option. Wood-effect finishes cost more but offer a more traditional appearance
Replacement or new opening: Replacing an existing window is normally cheaper than creating a completely new opening in the wall
Number of windows: Replacing several windows during the same visit can often reduce the installation cost per window
Glazing specification: Double glazing is standard on most modern uPVC sash windows. Triple glazing and specialist acoustic or energy-efficient glass will increase the price
Hardware upgrades: Premium handles, upgraded locking systems and enhanced security features all add to the overall cost
Location: Labour rates are typically higher in London and the South East than elsewhere in the UK
Access: First-floor windows or difficult-to-reach locations may require scaffolding or additional access equipment
On Checkatrade, you'll only find trades who meet our high standards and pass up to 12 checks.
Why choose uPVC sliding sash windows?
uPVC sliding sash windows offer many of the characterful features of traditional timber sash windows while reducing ongoing maintenance.
Some of the main benefits include:
Low maintenance: Unlike timber, uPVC doesn't need regular sanding, painting or staining and won't rot or warp
Improved energy efficiency: Modern double glazing and insulated frames help reduce heat loss and improve comfort throughout the year
Reduced draughts: Modern weather seals provide a much tighter fit than many older timber sash windows
Traditional appearance: Wood-effect finishes recreate the appearance of painted timber while offering the practical benefits of uPVC
Improved security: Modern locking systems offer greater security than many original sash window catches
Lower overall cost: uPVC sliding sash windows are generally much more affordable than replacing like-for-like timber sash windows
If you're still deciding which material is right for your home, comparing both options can help you balance appearance, maintenance requirements and budget.
Wondering if you need energy efficient windows? Whatever your need, from double glazing repairs, to finding an installer, we've got you covered. Even if you can't choose between window types.
Timber sliding sash window prices
Timber sliding sash windows remain the premium option. They're often required for listed buildings or may be preferred in conservation areas where maintaining the original appearance of a property is important.
Although they're significantly more expensive than uPVC, many homeowners choose timber because it can often be repaired, refurbished and maintained for decades.
As a guide, supply and fit costs for timber sash windows typically cost between:
£1,400–£1,580 for a 600mm × 900mm timber sash window
£1,500–£1,800 for a 1200mm × 1200mm timber sash window
Timber windows generally require more maintenance than uPVC, including periodic painting and occasional repairs to cords, putty and glazing.
However, if your existing timber sash windows are fundamentally sound, repairing or refurbishing them can often be more cost-effective than replacing them entirely.
uPVC sliding sash window cost calculator
The calculator below provides a guide price based on previous Checkatrade jobs.
Job Estimate Calculator
This calculator provides a guide price only. For a more accurate cost, compare quotes from a selection of checked window fitters working in your area.
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uPVC sliding sash windows cost checklist
Before requesting quotes:
Find a checked window fitter near you
Whether you're replacing a single sash window or upgrading every window in your home, an experienced installer will ensure your new windows fit correctly, comply with building regulations and perform as expected.
When comparing window fitters:
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Compare itemised quotes from a selection of checked tradespeople
Confirm whether installation, disposal and access equipment are included
Ask what guarantees are provided
Check that the installer is FENSA or CERTASS registered
Providing accurate measurements and photos of your existing windows can often help installers prepare a more accurate quote before visiting your property.
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FAQs
Most uPVC sliding sash windows cost between £520 and £800 per window, including supply and installation. The final price depends on the size, finish and glazing specification you choose.
Yes. uPVC sliding sash windows are generally much more affordable than timber equivalents, while also requiring less ongoing maintenance.
In most cases, no. Replacing like-for-like windows is permitted development in England. However, if you live in a conservation area, a listed building, or an area with an Article 4 direction, you may need planning permission, especially if the original windows were timber. Check with your local planning authority before ordering.
uPVC windows typically last 20-35 years before the frames need replacing. The double glazing units may need replacing sooner if they fail (misting between the panes). Many manufacturers offer a 10-year frame guarantee as standard.
Yes. If your existing timber sash windows are in reasonable condition, restoration is often a cost-effective alternative to full replacement. See our guides to sash window refurbishment cost and sash window cord repair cost for options.
The main disadvantages compared to casement windows are cost (sash windows cost more to manufacture and fit) and cleaning (most can't be tilted inward to clean the outside face from inside the room, as many casement designs can). Wood effect finishes are less convincing up close than white uPVC, and may not be acceptable in conservation areas where timber is required.
Most window fitters provide a combined supply-and-fit quote rather than charging separately for labour. If you'd like to compare prices, ask for an itemised quote showing what's included. See our window fitting cost guide for typical rates.
Usually not. Conservation areas typically require timber windows to preserve the character of the area. If you're not sure, check with your local planning authority before ordering.
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