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uPVC Window Boards (Internal Window Cills)
Low-maintenance internal window boards in square edge and bullnose finishes.
Designed for a clean, long-lasting finish without painting or upkeep.
Upgrade your internal window finish with our range of uPVC window boards — designed to give a clean, modern look without the hassle of painting or ongoing maintenance.
Whether you’re replacing old timber cills or covering over existing boards, these are built for a quick install and a long-lasting finish.
What you’ll find in this range
✔ Bullnose window boards – smooth rounded front edge for a softer, modern finish
✔ Square edge window boards – clean, sharp lines for a more contemporary look
✔ Multiple widths available to suit different window depths
✔ 5m lengths – ideal for reducing joins and waste
✔ Matching end caps available for a neat finish
Why choose uPVC window boards?
✔ No painting required – fit it and forget it
✔ Moisture resistant – ideal for kitchens, bathrooms and high-use areas
✔ Easy to cut and install using standard tools
✔ Durable finish that won’t rot, warp or peel like timber
✔ Wipe clean surface – perfect for everyday use
Square edge vs bullnose – what’s the difference?
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Bullnose boards have a rounded front edge and are typically used to cover over existing window boards
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Square edge boards have a flat front edge and give a sharper, more modern finish
If you’re unsure which one you need, it usually comes down to whether you’re capping over or fully replacing.
Trade tip
If your existing board is still solid, a bullnose board is the quickest upgrade — it caps straight over and saves ripping everything out.
If you’re going for a full refurb or want a sharper finish, go square edge.
✔ Delivery & support
✔ Nationwide delivery available
✔ Free delivery on orders over £150
✔ Need help choosing? Call us — real advice, not guesswork
Frequently Asked Questions
What is a uPVC window board?
A uPVC window board (also known as an internal window cill) is fitted beneath a window to create a clean finish and protect the wall below. It’s a low-maintenance alternative to traditional timber boards.
What’s the difference between bullnose and square edge window boards?
Bullnose window boards have a rounded front edge and are commonly used to cover over existing boards.
Square edge boards have a flat front edge and are typically used where a sharper, more modern finish is required.
Can uPVC window boards be fitted over existing boards?
Yes — in many cases they can be installed over existing timber window boards, as long as the base is structurally sound.
How do I choose the right size window board?
Measure the depth of your existing board or window reveal and choose a size that provides full coverage. It’s usually best to go slightly larger and trim back for a neat fit.
Are uPVC window boards suitable for kitchens and bathrooms?
Yes. uPVC is moisture-resistant and easy to clean, making it ideal for kitchens, bathrooms and other high-use areas.
Do I need end caps for window boards?
End caps are recommended wherever the ends of the board are visible. They provide a cleaner finish and protect the exposed edges.
Are these the same as fascia or capping boards?
No. These are internal window boards designed for use inside the property. Fascia and capping boards are used externally on the roofline.
Can I cut uPVC window boards myself?
Yes. They can be cut using standard tools such as a fine-tooth saw, making them suitable for both DIY and trade installation.