uPVC Sash Windows with Local Quality & Price Match

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Our Local Installations

Award winning glazing company with over 37,000 installations since 1984.

As your local window specialists, we’re proud of our award-winning installations and we now offer a price match to keep premium quality affordable for our customers. We’d love for you to see our affordable sash windows work first-hand so take a look at our local projects and our 4.9-star Trustpilot rating to see why our community rate us as #1!

Timber Alternative Sliding Sash Windows, Windsor, Berkshire

4.9 ★ Rating

Rated Excellent on Trustpilot

37,000

Installations

10 Years

Guarantee included

#1 Rated

Surrey, Oxfordshire & the South East

Why Choose Thames Valley Windows?

These aren't just windows. They're Thames Valley Windows.
We not only supply, but will also install high-quality uPVC windows throughout Berkshire, Surrey, Hampshire and the rest of the South East in order to either replace older aluminium, natural timber and uPVC windows in refurbishment projects on residential properties. We will also provide brand-new uPVC windows for new builds and extensions.

Our 10-year guarantee is standard on all our replacement windows, doors and conservatories. We have achieved ISO 9001 certification and are fully compliant with all the relevant industry bodies, including GGF and FENSA. We also hold the BSi kitemark for quality installations and surveys. We are one of only 33 companies in the UK to hold this accreditation for window and door installation.

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    Comprehensive Range of RAL Colour Finishes

    Like most of the other timber-effect windows we offer at Thames Valley Windows, our Heritage uPVC windows come in various exterior colour finish options, as listed below. While the Cherrywood, Rosewood and Smooth White all have an interior smooth white finish, Ivory, Black Woodgrain, Smooth Anthracite Grey, Irish Oak, French Grey, Ice Cream, Agate Grey and White Grain all have an interior white woodgrain finish.

    You also have the option for Cherrywood and Rosewood windows, where the interior colour matches the exterior colour, while System 10 and Rustique are available in Rosewood, Cherrywood, and Smooth White.

    uPVC Colour Range

    Frequently Asked Questions

    The cost of uPVC sash windows depends on the size of the windows, the number required, the style of glazing, the colour finish, the hardware and the complexity of the installation.

    For example, replacing a simple modern window with a uPVC sash window is usually more straightforward than replacing original box sash windows in a period home. That is why we provide a clear, made-to-measure quotation after understanding your property and what you want to achieve.

    Our aim is to give homeowners high-quality uPVC sash windows at a competitive price, with expert installation and no hidden extras. For like-for-like uPVC window quotes, we can also discuss price matching where the specification is comparable.

    Yes. uPVC Victorian sash windows are a popular choice for homeowners who want to keep the traditional character of their property while improving warmth, security and everyday usability.

    The important part is getting the details right. A good Victorian-style sash window should have slim, elegant proportions, traditional sash horns, authentic glazing bars where needed, and hardware that suits the age of the property. When these details are handled properly, uPVC sash windows can work beautifully on Victorian, Edwardian and other period-style homes.

    They also give you the benefit of modern double glazing, low-maintenance frames and easier operation, without the regular painting and upkeep usually associated with timber sash windows.

    It may be time to replace your sash windows if they are draughty, difficult to open, rattling in the frame, letting in noise, showing signs of rot, or making your home harder to heat.

    Modern replacement sash windows are designed to keep the traditional vertical sliding appearance while improving comfort and performance. You can keep the classic look of your home, but benefit from better insulation, stronger security, smoother operation and easier cleaning.

    uPVC sash windows are especially useful when you want the look of traditional sash windows without the ongoing maintenance of timber.

    Most problems with uPVC sash windows come from poor design, low-quality products or rushed installation.

    Common issues include frames that look too bulky, glazing bars that do not suit the property, poor proportions, stiff operation, draughts around the frame, or a finish that looks out of place on an older home.

    This is why sash windows should not be treated as a standard replacement window. The style, sightlines, sill details, architraves, hardware and installation method all matter. A well-made uPVC sash window should look balanced, move smoothly, seal properly and feel secure.

    Choosing an experienced installer is just as important as choosing the window itself.

    Horizontal sliding secondary glazing can be suitable in some homes, depending on the shape and layout of the existing window. It works by fitting a slim internal glazed panel behind the original window, helping to improve warmth, reduce draughts and cut outside noise.

    For traditional sash windows, vertical sliding secondary glazing is often the closest match because it follows the movement of the original window. However, horizontal sliding secondary glazing can still be a practical option for certain rooms, wider openings or specific layouts.

    Secondary glazing is a particularly useful solution where the original windows need to remain in place, such as in listed buildings, conservation areas or homes with planning restrictions.

    It may be possible, but Grade 2 listed double glazing normally requires Listed Building Consent. The rules depend on the property, the existing windows, the local authority and how much the proposed work would affect the character of the building.

    In many listed homes, replacing original windows with new double glazing is not the most straightforward route. Secondary glazing is often a more suitable option because it is fitted internally and keeps the outside appearance of the property largely unchanged.

    This can help improve warmth, reduce noise and make the home more comfortable, while protecting the historic appearance of the building.

    Yes, uPVC window frames can be painted or professionally sprayed, but it is usually better to choose the right colour when ordering new windows.

    Factory-applied colours and woodgrain finishes are designed to be durable, consistent and long-lasting. Painting existing uPVC requires careful preparation and the right specialist coating. If the surface is not prepared properly, the finish may peel, fade or look uneven over time.

    For new uPVC sash windows, there are a range of colour and woodgrain options available, including traditional finishes that suit period and character homes. If you are trying to match existing windows, doors or exterior details, it is best to discuss the colour options before placing your order.

    A uPVC sash window can work very well as a bathroom window in a period home, especially when you want to keep a traditional appearance from the outside.

    For bathrooms, privacy and ventilation are the two main priorities. Obscure or frosted glass can help protect privacy, while an opening sash allows fresh air into the room. Good ventilation is important because bathrooms naturally create moisture, which can lead to condensation, mould and damp if it is not managed properly.

    A uPVC sash bathroom window gives you the character of a traditional window with the practical benefits of modern glazing, secure locking, low maintenance and easy cleaning.

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