Free Delivery on Roofline, Roomline, External Cladding & Window Sill Orders Over £100 (Offer exlcudes roofing sheets, hygienic and bathroom wall cladding)


White Square UPVC Internal Window Sill & Board



including VAT


225mm - 9" Window Sill - Square Cover Board

White UPVC Square Window Board & Sill

Stylish and practical,our White UPVC Square Window Board & Sill is scratch and stain resistant for long-lasting good looks. Unlike wood, it won’t rot, shrink or warp and is sealed for protection against moisture. Perfect for any environment, this product delivers flawless elegance in a low maintenance format.

With a smooth gloss finish, this UPVC window board and sill can easily be trimmed to size and is effortless to install. It will never need sanding down or painting, so you can look forward to years of hassle-free durability. For outstanding aesthetics in any room, this durable alternative to wood is both cost-effective and easy to clean. We stock matching end caps for seamless style.


Available Sizes

  • Length:5000mm only available length
  • Width: 150mm, 175mm, 200mm, 225mm, 250mm, 300mm, 350mm and 450mm
  • Thickness: 9mm

Product Specifications

  • 10 year manufacturer’s guarantee
  • Class 1 fire resistance rating, meaning it won’t burn
  • Fully recyclable
  • UV stable
  • Non-toxic



This product can be used internally to replace damaged or tired-looking wooden window boards and sills. It is suitable for both renovation projects and new builds. Consider it for extensions, summerhouses, conservatories and garden offices/workshops as well as around the home. It can be installed by a DIY enthusiast or trades person.


Buy White UPVC Square Window Board & Sill Online

Order now at the best price and benefit from UK delivery in 1 to 3 working days. Got a question? We offer completely free technical advice.