Square edge uPVC window boards (also known as internal window cills) provide a clean, modern finish beneath uPVC windows and are commonly used to cover existing timber boards or for new installations.
 
✔ Square edge profile for a sharp, contemporary internal finish
✔ Designed for internal use under uPVC windows and door openings
✔ Ideal for covering existing window boards without full replacement
✔ Durable uPVC construction – lightweight, easy to cut and install
✔ Moisture-resistant surface suitable for kitchens, bathrooms and utility areas
✔ Low maintenance – wipe clean, no painting or sealing required
✔ Consistent white finish to match uPVC windows, trims and interiors
✔ Available in multiple widths to suit different window depths
 
These uPVC window boards are a practical alternative to timber, offering a longer-lasting, maintenance-free solution that won’t rot, swell or require repainting. Commonly used in both refurbishment and new build projects, they provide a neat, professional finish with minimal installation time.