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About MDF Window Board

When you need a new or replacement window ledge or board, our range of MDF pre-white primed products offers a popular solution for your job.

Our MDF window boards are made from medium-density fibreboard, giving them an imperfection-free surface finish. MDF is made from thousands of tiny resin-bonded fibres of wood, if treated right and finished to protect from moisture, it is an easy-to-fit and long-lasting solution for most projects.

Explore our range of high-quality MDF window boards today.

MDF Window Boards Cut To Size

At Harlow Bros, we provide a range of pre-cut window boards to meet your project specifications. These include, but are not limited to:

  • 25 x 144 mm
  • 25 x 168 mm
  • 25 x 194 mm
  • 25 x 219 mm
  • 25 x 244 mm
  • 25 x 294 mm

We've set up our range so you can buy your piece to the meterage size that you need. Buy what you need without paying for wasted product.

Why Shop For Window Boards With Harlow Bros?

At Harlow Bros, we have been producing and supplying the highest-quality building materials since we opened our doors in the 1920s. Our legacy as a top retailer is important to us and we continue to supply our customers with the best products available.

Buy fantastic MDF window boards for your project today.

Our Other MDF Building Materials

Our MDF range extends far beyond just window boards. We also stock MDF building materials including:

All of our building materials are available in a vast range of sizes and thicknesses to suit your project's needs. Shop exceptional MDF today!


What does MDF stand for?

MDF stands for 'Medium Density Fibreboard'. Fibreboard is a specially engineered wood-based sheet material created by bonding wood fibres with a strong synthetic resin adhesive.

What type of paint to use on MDF window boards?

Our MDF window boards are pre primed with a white primer paint, meaning it will be ready for a top coat as soon as it arrives with you.

You can use both oil-based paint and water-based paint on MDF. We recommend using high-quality wood paint to get the best results from your paint job.

Ensure that you treat the boards on all sides (especially the edges or sawn ends) with a water-resistant sealer first to prevent any swelling from moisture in the paint.

Are MDF window boards waterproof?

Whilst moisture resistant MDF is available, it is not generally recommended for high-moisture areas. If you wish to improve the water-resistance of your window boards, it is recommended that you use a sealer to protect the wood.