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Square Edge Window Boards
Square Edge Window Boards & Internal Window Sills
Discover our premium range of Square Edge Window Boards, expertly machined from carefully selected solid hardwoods to provide a clean, contemporary finish beneath any internal window. Designed for both modern and traditional homes, our square edge window boards combine the natural beauty of real timber with exceptional durability and precision machining.
Whether you are replacing existing window boards, renovating an older property or completing a new-build project, our solid hardwood window sills provide a stylish finishing detail that will stand the test of time. Every board is machined to order and supplied unfinished, allowing you to apply the finish that best complements your interior.
Why Choose Square Edge Window Boards?
The square edge profile has become one of the most popular choices for contemporary homes thanks to its crisp, straight lines and minimalist appearance. Unlike more decorative profiles, the square edge offers a clean architectural finish that complements modern skirting boards, architraves, doors and interior joinery.
Manufactured from genuine solid hardwood rather than MDF or veneered materials, our window boards provide outstanding strength, durability and long-term performance. They can also be sanded, refinished and restored if required, making them an excellent investment for your home.
The simple profile also allows the natural beauty of the timber to become the focal point, showcasing the grain, colour and character of each hardwood species.
Available Hardwood Species
Our square edge window boards are available in a selection of premium hardwoods, each offering its own distinctive appearance and characteristics.
- European Oak – A timeless hardwood with warm golden tones and a distinctive natural grain.
- Ash – A light-coloured hardwood with beautiful flowing grain, ideal for bright contemporary interiors.
- Sapele – A premium hardwood featuring rich reddish-brown colouring and decorative interlocking grain.
- Tulipwood – A smooth, stable hardwood that is particularly well suited to painted joinery while also looking attractive with a clear finish.
Every timber species is carefully selected and kiln-dried before machining to ensure excellent stability and a high-quality finish.
Manufactured from Premium Hardwood
All of our square edge window boards are manufactured from premium kiln-dried hardwood. Kiln drying helps reduce the timber's moisture content before machining, improving stability and helping to minimise movement once installed.
Please note that boards measuring 200mm wide and above are manufactured using carefully selected jointed sections of solid timber to achieve the required width whilst maintaining the strength, stability and premium appearance expected from genuine hardwood.
As timber is a natural material, every board will display its own unique grain pattern, colour variation and character. These natural features ensure that every installation has an individual appearance.
Supplied Unfinished for Complete Flexibility
Our square edge window boards are supplied unfinished, allowing you to achieve the exact finish you require.
Popular finishing options include:
- Hardwax oil
- Clear timber oil
- Interior varnish
- Matt or satin lacquer
- Wood stain
- Paint (particularly suitable for Tulipwood)
Whether you wish to highlight the natural grain of Oak, Ash or Sapele, or create a beautifully painted finish with Tulipwood, our solid hardwood window boards provide complete flexibility.
Suitable for Every Project
Our square edge window boards are suitable for a wide range of residential and commercial applications, including:
- Replacement internal window sills
- New-build homes
- Property renovations
- Period property restoration
- Home extensions
- Bespoke joinery projects
- Commercial developments
Their clean, understated profile makes them particularly popular in contemporary homes where simple architectural details are preferred.
Why Buy Square Edge Window Boards from Tools & Timber?
- Manufactured from premium solid hardwood
- Available in European Oak, Ash, Sapele and Tulipwood
- Machined to order
- Multiple thicknesses, widths and lengths available
- Supplied unfinished for complete finishing flexibility
- Suitable for domestic and commercial applications
- Expertly machined by experienced timber specialists
Browse our complete range of square edge window boards above to find the perfect timber for your project. Combining premium hardwood quality, precision machining and a clean contemporary profile, our solid timber window sills provide a durable and elegant finishing detail that will enhance any interior.