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Capping Boards – Easy Window Sill Makeovers with UPVC Covers
Refresh your windows quickly and affordably with our range of UPVC capping boards – the perfect solution for covering tired or damaged internal window sills. Designed for both homeowners and professional installers, these trims provide a smooth, clean finish without the need to remove old boards.
Made from durable, moisture-resistant UPVC, our capping boards are ideal for kitchens, bathrooms, conservatories, or any high-humidity areas. Available in multiple widths (from 100mm to 400mm) and popular finishes like white, anthracite grey, golden oak and black ash.
✔ Key Features:
✂️ Easy to Install – Just cut to size and stick over existing sills using grab adhesive or silicone
💧 Waterproof & Low Maintenance – Wipe-clean surface, ideal for damp environments
🎨 Multiple Finishes Available – Choose from modern and traditional colours to match your décor
🧱 No Need to Remove Old Boards – Simply cap over for a fresh, clean look
🔨 Perfect for DIY or Trade Use – Suitable for refurbishments, renovations, and new installations
Whether you’re updating a single window or refreshing an entire property, our capping boards make the job faster, cleaner, and more cost-effective — without compromising on appearance or durability.
Capping Boards
Anthracite Grey UPVC 1.25m x 9mm Capping Board – Depth Options: 150mm to 300mm
In stock
£22.24 – £38.51 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 1.25m x 9mm(2 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£33.35 – £57.76 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 1.25m x 9mm(4 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£66.72 – £115.53 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 1.5m x 9mm Capping Board – Depth Options: 150mm to 300mm
In stock
£22.86 – £39.58 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 1.5m x 9mm(2 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£34.28 – £59.37 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 1.5m x 9mm(4 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£68.57 – £118.74 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 1.75m x 9mm Capping Board – Depth Options: 150mm to 300mm
In stock
£23.47 – £40.65 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 1.75m x 9mm(2 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£35.21 – £60.97 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 1.75m x 9mm(4 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£70.42 – £121.95 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 2m x 9mm Capping Board – Depth Options: 150mm to 300mm
In stock
£24.71 – £42.79 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 2m x 9mm(2 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£37.06 – £64.18 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 2m x 9mm(4 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£74.13 – £128.37 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 3m x 9mm Capping Board – Depth Options: 150mm to 300mm
In stock
£52.18 – £72.07 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 3m x 9mm(2 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£65.77 – £95.60 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Anthracite Grey UPVC 3m x 9mm(4 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£106.54 – £166.21 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Black Ash UPVC 1.25m x 9mm Capping Board – Depth Options: 150mm to 300mm
In stock
£22.24 – £38.51 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Black Ash UPVC 1.25m x 9mm(2 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£33.35 – £57.76 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Black Ash UPVC 1.25m x 9mm(4 Pack)Capping Board – Depth Options: 150mm to 300mm
In stock
£66.72 – £115.53 (Vat inc.)
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This product has multiple variants. The options may be chosen on the product page
Abundant Offer for Individual and Business Clients!
We are dedicated to creating the most efficient solutions and offering a wide selection of products for people eager to build the home of their dreams!
With our extensive range of products, you can choose not only the type of doors, windows, or other items but also personalize them to suit your needs. With Windows4You, you are in charge!
Changing the color? No problem! Adjusting the size? Piece of cake!
Now, you can design your home on your own terms!
If you encounter any issues with installation, you can count on us. With 11 years of experience as windows and doors installers, we ensure professional support every step of the way.
We are also open to partnerships in the B2B sector. Learn more about our B2B offer here:
https://www.window4you.co.uk/trade
Window sills