The Window Sanctuary on Facebook

Timber sash windows



At the Window Sanctuary, we offer two different types of sash windows that suit properties of all periods, whether they are Edwardian, Victorian or Georgian.

Traditional Sash Windows

As purists, we would recommend traditional sash windows that are made of timber. These include 28mm double glazed units which have the highest energy rating, offering thermal efficiency and compliance with the most-recent building regulations. All of our products are extremely high in quality and will last you a lifetime. They are available in hardwoods such as Red Grandis or Accoya. Our products are subject to a rigorous 5-stage process to ensure that they are protected and don’t twist and warp like old timber can. They are painted and hand sprayed in the factory with 3 coats of micro-porous paint which allows them to withstand the elements with minimum maintenance, so there is no need to paint them for up to 10 years. With over 200 RAL colours to choose from + stock colours, these windows complement and vastly improve the overall look and appearance of your home or building.

Traditional timber sash windows would have had lead weights and ropes at the side and within the frames. The lead weights were there to counter-balance the weight of the sash. The lead weights on the ropes, which pass through the pulleys, allowed the windows to go up and down freely. If the lead weight wasn’t enough, or the ropes were binding, the window wouldn’t open or it might even close too fast.

When we replace sash windows, we will also replace all of the ropes and weights.  If you don’t want the potential maintenance of ropes and weights, we can install a spiral balanced hinge instead. This allows the window to open and close without the use of ropes and weights. This option also makes the windows slimmer because you don’t need to have the mechanism inside – providing a traditional look with a more modern opening system.  You can also specify bespoke window furniture such as Fitch fasteners or Board & Clasp fasteners.

Heritage Sash Windows

For a period property that has existing timber windows you may prefer to replace like for like to ensure the character of the property is not affected. Heritage sash windows have all the advantages of the traditional sash window but are specifically for listed buildings or those in a conservation area.

This is a much better option for properties that would otherwise have to install secondary-glazing. These products will sympathetically replicate the original designs and can accommodate high-performance, slimline, sealed units to satisfy the requirements of your local Conservation Officer. For a nominal fee, we can assist with your planning application if required.

Energy saving performance

Ask us about our lastest Landvac® glazing range which achieves 0.4 w/m2k overall U value or 0.8 w/m2k overall U value on our Heritage range of timber sash windows.

A wide choice of quality fittings are available in a range of complementary finishes.

Our standard timber sash windows achieve an impressive 1.5 w/m2k overall U value and, when glazed with energy-saving thermafloat warm-edge sealed units, can achieve 1.1 w/m2k. Seals are of Q-Lon to ensure maximum draught-free surrounds and the ultra-tight lockable furniture is PAS 24-compliant. 



A rigorous 5-stage process ensures that each of our products is protected and painted, and can withstand the elements with minimum maintenance.

Our method is:

Stage 1 – A chemical dip to minimise moisture absorption
Stage 2 – A chemical dip to protect against fungi, insect infestation, and mould growth
Stage 3 – Application of primer and undercoats using micro-porous products
Stage 4 – Spray finish first coat according to your colour choice
Stage 5 – Spray finish second coat

Micro-porous paints allow all timber fibres to be penetrated and to build up protection from within, unlike cellulose paints which form a skin on the outer face and require time-consuming treatments on a regular basis. To keep new products in pristine condition, we recommended a quick wipe down and a further coat be applied after approximately ten years.


  • Replicates appearance of traditional style sash windows
  • Accoya and Red Grandis timber lasts a lifetime
  • Each window is bespokely made using traditional methods
  • Low U Values & excellent thermal efficiency
  • 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
Click to book a free site consultation


Improve the look of your home with timber sash windows from our collection. At The Window Sanctuary in Brasted, Kent, we utilise our skilled craftsmen to design and supply authentic sliding sash windows. Made from specially selected pine or hardwood, we ensure that all windows are manufactured to the very highest quality, ensuring that you get a superior product. All of our fitters are directly employed by us so we guarantee a superior installation in your home.