Buy MDF Window Sills
Crafted from moisture-resistant high-density fibreboard, our window sills combine durability with elegant design. Each piece is manufactured to precise specifications, ensuring the perfect finish for your internal window sills.
Available in classic and contemporary profiles, with custom sizing options to suit any window configuration.
Our range offers exceptional durability with a perfect finish, ideal for internal window sills in any interior style.
Buy today to get:
- 25-year manufacturer's guarantee for lasting quality
- Advanced moisture-resistant HDF construction
- Free delivery on orders over £30
- Factory-applied primer options available
Window Board Selection Guide
- Profile Style Choose from Bullnose, Square, or Double Edge profiles to match your interior style preferences.
- Dimensions Available in widths from 150mm to 400mm, with lengths up to 4200mm for any window size.
- Finish Options Select from unprimed, primed, or undercoated finishes to suit your installation needs.
- Installation Type Optional tongue fitting available for enhanced installation and secure fitting.
A timeless design featuring a single rounded edge, perfect for both traditional and contemporary window settings.
Clean lines and sharp edges define this contemporary design, ideal for modern interiors.
Distinguished by dual rounded edges with a flat central section, adding refined detail to any window setting.
Modern elegance with dual chamfered edges and a flat central section, perfect for contemporary interiors.
Product Information
- Advanced moisture-resistant HDF construction, ideal for internal window sills
- Available with factory-applied primer or undercoat options
- Optional tongue fitting available for enhanced installation
- Custom sizing service available for perfect fit
Service Benefits
- 25-year manufacturer's guarantee on all window boards
- Free delivery on all orders over £30
- Fitting and help guides available
- Professional technical support available
Key Features
- Available in 18mm and 25mm thickness
- Made to order in our Birmingham workshop
- Choose rounded edge or square edge finish
- Two coats of primer, sanded between each coat
Order Information
- Need custom sizes? Call us on 0121 328 2179
- Next day delivery when you order before 2pm
- Suitable for homes and commercial buildings
- Questions? Email info@skirtingworld.co.uk
About Our Window Boards
We make our window boards from moisture-resistant MDF. This material stays more stable than pine or oak, with fewer surface problems like swelling or marks.
Each board is made to order in our Birmingham workshop. We cut them to your exact measurements to ensure a perfect fit for your windows.
We offer 18mm and 25mm thicknesses as standard - these are the most common sizes in UK homes. Need a different size? Just get in touch.
Choose our primed option and your boards come ready for painting. We apply two coats of water-based primer and sand between each coat for a smooth finish.
The standard finish has a rounded front edge (bullnose), but we can make them square if you prefer. The rounded edge runs from the top surface all the way around to the bottom.
Common Questions
What's the difference between window sill and window board? They're the same thing. In Britain, we often use 'window board'. If it's deep enough to sit on, it becomes a window seat.
Where do these window boards go? They fit on the inside bottom edge of your window. Our MDF boards are for indoor use only.
What's their purpose? Window boards support your window frame, stop warping, and give you a useful surface. They also finish off the look of your window.
Which is better - plastic or MDF? Use plastic (UPVC) outside as it handles weather better. Use our MDF boards inside as they paint well and look better.
How far should the board stick out? At least 25mm (1 inch) past your window frame. This helps protect the wall below.
When should window boards be fitted? Fit them before plastering for the neatest finish. It's harder to fit them properly afterwards.