Historic Timber Horizontal Sash Windows

Also commonly referred to as a Yorkshire sash window, our historic timber horizontal sash window couples a traditional sliding mechanism with advanced draught proofing. For smooth opening and closing with little effort, the sliding mechanism is operated by a low resistance track system.

As with all windows in our Historic Range, the historic timber horizontal sash window can be manufactured with very narrow profiles allowing them to accurately replicate the appearance of the original windows. This is particularly important on the meeting rail (where the two sashes meet) where we are able to supply a 35mm width for single glazing and a 40mm width for double glazing.

Our historic timber horizontal sash window can be arranged in almost any configuration, including:

  • Right sliding;
  • Left sliding;
  • Fixed.

In addition to the above opening types, they can be customised in many other ways to allow them to match accurately with any existing features that may need to be replicated, including profile moulds and widths. The paint or stain finish can also be accurately matched. Whilst we offer a number of paint and stain colour options (see the Materials tab for all available), we can provide a precise match to the original colour; all we would need is a physical sample or a RAL, Natural Colour System or British Standard colour reference.

Across our Historic Range we offer both single and slim insulated glazing units (IGUs). All of our slim insulated glazing units are fully tested to the requirements for the durability of glass units given in the BS EN 1279 series of standard for Glass in Buildings.

To mimic the reflections provided by original glass, we can incorporate either hand or machine drawn glass into the window design.

  • Historic Range Yorkshire Sash Window
  • this historic windmill is fitted with our horizontal sash windows
  • Cottage with our historic range horizontal sash windows

Download Technical Specifications

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


Historic Timber Sliding Sash Windows - Key Features

historic timber Yorkshire sash window

Improved Energy Efficiency

For our Historic Range we provide the option of slim insulated glazing units to replace original single glazing. Our standard historic glazing incorporates a cavity of 6mm but we can also incorporate units with a 4mm cavity.

glazing in a timber casement window

Choice of Profiles

We can incorporate solid glazing bars into the design of our historic timber Yorkshire sash windows. Available in a variety of profiles, including square and ovolo, we offer 2mm glazing bars for single glazing and 24mm for narrow cavity insulated glazing.

security features of a horizontal sash window

High Security

To enhance security, the windows are fitted with sash fasteners and stops, allowing secure locked and ventilation positions.

example of our machine drawn glass for Traditional Optics

Restoration Glass with Traditional Optics

To help address the challenges concerning the loss of authentic reflection of the original glazing, we can incorporate both hand and machine drawn glass into the design of our historic horizontal sliding sash window.

putty glazed historic timber yorkshire sash window

Original Glazing Methods

To exactly replicate the aesthetics and the production methods of the original window, we have developed an external putty glazing system. Utilising modern materials to maximise performance, we are able to award a five year guarantee against glazing unit failure on all external puttied installations.

Timber Coating Ral Colour Options

Paint and Stain Colours

For further customisation we offer an extensive selection of paint and stain colours. If the colour that you require is not included in our selection, then we do offer a colour matching service.


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