White UPVC Window Sill Cover – 1.75m Long, 9mm Thick (1 Pack – 100–400mm Depth Options)

Give your window sills a clean and lasting upgrade with our White UPVC Capping Board, now available in a practical 1.75 metre length. Manufactured from rigid, 9mm thick UPVC, this board is perfect for covering worn or outdated timber or MDF window sills without removing them.

The gloss white surface provides a sleek, professional finish and is fully waterproof, UV-resistant, and easy to clean. Ideal for use in living areas, kitchens, bathrooms, and rental properties, this board delivers excellent value and performance for both DIY and trade applications.

Available in widths from 100mm to 400mm, it’s easy to find the right fit for any sill type, whether narrow or wide. Quick to install using adhesive or screws.

Key Features

• 1 Pack – 1.75m Length – Ideal for single window installations
• 9mm Thickness – Sturdy and resistant to warping or sagging
• Gloss White Finish – Bright and smooth, no painting required
• Fully Waterproof – Suitable for damp areas like bathrooms
• UV Stable – Won’t fade or discolour in sunlight
• 100–400mm Widths – Choose the size that fits your sill
• Easy Installation – Fix with adhesive or screws
• Optional Accessories – End caps and trims available separately

Common Uses

• Refurbishing internal timber or MDF window sills
• DIY home improvement and property upgrades
• Bathroom, kitchen, or conservatory installations
• Rental property renovations
• Covering damaged or stained woodwork quickly

Technical Specifications

Installation Instructions

1. Clean the existing sill surface thoroughly
2. Cut the board to the required size using a fine-tooth saw
3. Test fit and trim if necessary
4. Apply a suitable grab adhesive (e.g., CT1, Gripfill) to the reverse side
5. Press firmly into place and hold for 60 seconds
6. Optional: seal edges with white silicone for a neat finish

Why Choose Windows4You?

Windows4You is a UK-based supplier of UPVC window boards, trims, fascias, and capping systems. We’re known for fast dispatch, high-quality products, and reliable customer support. Whether you’re a DIYer or trade professional, we’re here to help you get the job done right.