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Timber Casement Windows


At the Window Sanctuary, we specialise in two different types of timber casement windows.

Standard Timber Casement Windows

Many clients who are replacing their timber windows will already have timber casement windows that are single-glazed, possibly a little rotten and will therefore be in need of a modern double-glazed version.

We offer a wide range of modern, double-glazed windows that are ideal for unlisted residential properties where replacement windows are required. They are also well suited to new-build projects which must achieve all of the relevant building regulations. These products include the latest thermal technology and energy ratings, maximum security, trickle ventilation and require less maintenance. These windows offer excellent value for money and suit most properties.

All of our products are extremely high quality and will last a lifetime. They are available in hardwoods such as Red Grandis or Accoya. At The Window Sanctuary, we ensure they are chemically dipped and prepared so they won’t twist and warp like old timber. They are then hand sprayed in the factory with 3 coats of micro-porous paint, so there is no need to paint them for up to 10 years. There are over 200 RAL colours to choose from + stock colours.

Heritage Timber Casement Windows

With a period property that has existing timber windows, you may prefer to, or be required to, replace like for like to ensure the character of the property is not affected. Old timber windows will bend and contract with heat and cold, but modern timbers are treated so that the frame does not move with the changing temperature. These windows have been specifically designed to offer a compelling solution for aesthetics and energy efficiency when replacing windows in listed and historically important buildings and for properties in areas of outstanding natural beauty.



At The Window Sanctuary, we supply a wide range of windows that are perfect for old cottages, listed properties or those in conservation areas, due to their thin sections, traditional ironmongery and ultra-slim glazing. The Heritage range has reinvented the market for highly traditional fenestration products, as they deliver exceptional energy efficiency and guarantees. They replicate the appearance of traditional single-glazed windows of the past while delivering exceptional performance.


  •  Low U Values + excellent thermal efficiency
  • Slim sightlines
  • Low maintenance
  • Replicates appearance of traditional style casement windows
  • Over 200 RAL colours to choose from + stock colours - factory sprayed with 3 coats of micro-porous paint - no need to paint for up to 10 years
  • Complies with modern Building Regulations.
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These innovative, high performance windows offer the best of all worlds: the appearance of the traditional single-glazed windows of yesteryear, modern levels of heat and noise insulation, plus low maintenance, durability, sustainability, and low life-cycle costs.