Window Boards

Window boards provide the essential finishing touch for interior window reveals, creating a clean, functional surface that frames your windows and protects the wall beneath. Whether you're fitting new windows during a renovation or replacing worn sills in period properties, quality window boards deliver both practical durability and aesthetic appeal that complements any interior style.

Our Window Board Selection

McMahons stocks a carefully curated range of interior sill boards to suit various installation requirements and design preferences.

• MDF boards offering smooth, paintable surfaces ideal for modern interiors requiring a crisp, uniform finish
• Solid timber options providing natural warmth and character, perfect for traditional homes and heritage renovations
• Moisture-resistant variants designed for kitchens, bathrooms, and utility rooms where humidity levels fluctuate
• Pre-primed boards reducing preparation time on site and ensuring consistent paint adhesion
• Various depths and thicknesses to accommodate different wall constructions and window frame profiles

For coordinating trim and finishing profiles, browse our complete Timber Mouldings & Skirting collection to achieve a cohesive look throughout your project.

Selecting the right board depends on room conditions and installation context. Consider moisture-resistant materials for high-humidity spaces, while standard MDF works well in bedrooms and living areas. Measure your reveal depth carefully, allowing for a slight overhang at the front edge to create a professional shadow line.

Why Choose McMahons for Your Internal Sills?

With nearly two centuries serving Ireland's building trade, McMahons understands that finishing materials need to arrive on site undamaged and ready to install. Our expert staff can advise on the most suitable board type for your specific application, helping you avoid costly mistakes and wasted materials. Trade professionals benefit from consistent stock availability and knowledgeable counter service that keeps projects moving efficiently. To streamline your ordering and access trade pricing, set up a McMahons trade account today.