MDF Window Boards

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Primed MDF Window Board – 3.6m Length - Wern-woodPrimed MDF Window Board – 3.6m Length - Wern-wood
Primed Bullnose MDF Window Board – 25mm × 3.6m
From £27.50
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MDF window boards for internal window sills

MDF window boards are used to finish the inside base of a window opening. They are also commonly searched for as MDF window sills or window cills. Our range is focused on primed MDF window board for a clean painted interior finish.

Bullnose MDF window board

Our bullnose MDF window board has a rounded front edge rather than a square front profile. This gives the exposed edge of the finished window sill a softer profile while keeping the main board flat and straightforward to cut to length.

MDF window board sizes

All current boards are 25mm thick and 3.6m long, with three width options:

  • 225mm MDF window board
  • 250mm MDF window board
  • 300mm MDF window board

Choose the width by measuring the full depth of the window reveal and allowing for the projection you want beyond the finished wall face. Measure the opening before ordering rather than relying on a standard sill depth.

Primed MDF window sill boards

The boards are factory primed, providing a smooth base for the final painted finish. They are intended for internal window-board and window-sill applications in renovation and new-build work.

Window board, window sill or window cill?

These terms are often used for the same internal finishing component. Window board describes the board itself, while window sill and window cill are common names customers use when looking for the finished ledge beneath an internal window.

Complete the interior finish

For matching interior joinery and finishing materials, browse our skirting boards and architrave.