Traditional Timber Sliding Sash Windows

Traditional in design our timber sliding sash windows provide the highest level of performance. Our innovative concealed weather seals ensure excellent protection from the elements. Being air tight and discreet they do not detract from the authentic appearance of the window.

For absolute authenticity we provide the traditional cord-and-weights mechanism in the traditional box design. We also offer spiral balance and tilting spiral balance timber sliding sash windows, which have narrower frame profiles to suit more modern reveal constructions.

As is the case for all of our windows, security is intrinsic to design. On all timber sliding sash windows, locking sash fasteners are fitted to the meeting rail. Sash stops are fitted on either side of the frame so that whilst they can be opened for ventilation, the opening is restricted for security and safety.

In all sliding sash designs we use Accoya® timber linings to provide greater durability. In addition we only manufacture external facing astragal bars from Accoya® to provide lasting performance. As standard, the astragal bars are 21mm and fixed into the sash.

For period detailing we have a number of sash horn designs – see the Design tab for more details. We can also provide a wide range of curved work designs, including top arch, internal sash arches and curved fronted windows. Coupled with our vast selection of sash furniture and coating options, our timber sliding sash windows can be designed to exactly match your project requirements.

  • Traditional Timber Sliding Sash Window External
  • Tilting Sliding Sash Window
  • Wooden sliding sash window from the Tradition Range.
  • Artisan Development - internal image of the bathroom with George Barnsdale timber sliding sash window
  • Dulwich School - timber sash windows
  • Timber Sliding Sash Window - Twr-y-Felin Hotel

Download Technical Specifications

For Performance Data, CAD drawings and NBS Data visit our Technical Specifications page


Traditional Timber Sliding Sash Windows - Key Features

The Sash Collection - Sash Fastener at Twr-y-Felin Hotel

Elegant Sash Furniture

For our sliding sash windows we have an elegant furniture collection that provides simple, effortless operation and high security. The Sash Collection includes sash pull, sash fastener, sash stop, sash eye and sash pulley.

Timber Coating Ral Colour Options

Paint & Stain Options

In addition to our traditional range of colours, we can match existing colours. All we require is a RAL colour or physical sample. Dual colour is available.

Obscure glazing example

Glazing Options

We have a broad selection of glazing options available including acoustic reduction, solar reduction and enhanced thermal performance. Decorative and obscure glazing is also offered.

Timber Sliding Sash Windows - Accoya linings

Enhanced Durability

Frame linings have always been a vulnerable point within sliding sash window designs. To overcome this issue we only use Accoya® timber linings which provide greater durability.

The Sash Collection - Sash Stops at Twr-y-Felin Hotel

Excellent Security

For maximum security, locking sash fasteners are fitted to the meeting rail and sash stops are fitted on either side of the frame.

Timber Species

Sustainably Sourced Timber

We only use sustainably sourced timber and we can provide full FSC® chain of custody for all sliding sash windows upon request.


We know that replacing wooden windows and doors can be a big undertaking, and so we offer a range of services to make the undertaking as simple and pain-free as possible.


Our industry leading manufacturer backed guarantees ensure that our windows and doors will last for many years.

  • 10 Year Glazing Unit Guarantee
  • 10 Year Hardware Guarantee
  • 30 Year Wood Preservative Guarantee
  • 7 Year Stain Coating Guarantee
  • 10 Year Paint Guarantee
  • 10 Year Weather Seal Guarantee