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Traditional Box Sash

The classic yet timeless design of the heritage sash window is a popular feature of many historical buildings dating back to the early 20th century and earlier.
The classic yet timeless design of the heritage sash window is a popular feature of many historical buildings dating back to the early 20th century and earlier.

Whether you are looking for a restoration or replacement heritage sash window, we can provide you with traditional looking timber frames that look authentic and tie in with the original look of the building to help adhere to any restrictions you may have as a heritage or listed building.

Specifications

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Traditional Box Sash Windows – Single
Traditional Box Sash Windows – Double
Traditional Box Sash Windows – Triple
Product guidance - as standard
Frame
100 x 140 mm (lining width x frame depth), manufactured using mortise and tenon joints, glued and mechanically fixed
Sash
39 x 45 mm top rail and stiles, 90 x 55 mm bottom rail, 45 x 55 mm meeting rail
Mullion/transom
39 x 45 mm top rail and stiles, 90 x 55 mm bottom rail, 45 x 55 mm meeting rail
Sill projection
35 mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm
Staff / parting beads
Timber
Wood moisture content
12-19%
Glazing beads
External Traditional putty glazed
Product specification
Material
Frame+Sashes Engineered redwood, Bottom Cill in Solid Hardwood - Standard. Engineered hardwood, Accoya, European oak.
Finish
Three coat spray applied factory finish using water based micro-porous paint/ stain.
Colour
White - RAL 9016 - Standard. Any RAL - from RAL classic range. Stain - from TRC stain range.
Glazing
Double glazed, 4/16/4 Low-E top sash – 4toughened/16/4 toughened bottom sash - Standard, Ug-value: 1.1 W/m²K; g-value: 0.52;
U-value
1.5 W/m²K - double glazed.
Perimeter spacer bars
White warm edge perimeter spacer with white warm edge integral spacers - Standard. Silver and Black spacer optional.
Frame profile moulding
Ovolo 1, Ovolo 2, Lambs Tongue.
Trickle ventilation
Concealed through frame head trickle ventilator. EA 1700, 4400, 5000 mm²
Child restrictor
Angel lock standard. Traditional Sash Stop optional.
Downloads Downloads
Traditional Box Sash Windows – Single
Traditional Box Sash Windows – Double
Traditional Box Sash Windows – Triple

Get in touch

Get in touch

Get in touch

Thanks for getting in touch.
We'll get back to you shortly.

Need an urgent response?

How we create and fit
genuine looking heritage
sash windows

Our heritage sash windows are made to match box sash windows that are a staple of Victorian homes. These premium sash windows, with the classic weight-and-pulley mechanism, are the perfect choice for replacement windows in listing buildings, while also suiting high-end architect-led new developments.

We use traditional putty externally to secure high-performance Slimlite glass. Single or double glazed, this authentic-looking slim glass satisfies the modern demands for acoustic and thermal performance.

Solid glazing bars come as standard, so each window comprises a number of individual glass panels, giving these heritage sash windows genuine character.

We can also add safety features to make them more suitable for a family setting, with an angel lock as standard and traditional sash stop. Restrictors can be fitted to make the opening of the sash to 100mm to ensure the safety of those in your property.

All windows are finished with three coats of sprayed applied microporous water based paint, to ensure the smooth operation and optimum performance of the window.

For non-listed buildings, you may also wish to browse our collection of traditional timber windows and doors.

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