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Traditional Box Sash Windows

The classic yet timeless design of the traditional box sash window is a popular feature of many historical buildings dating back to the early 20th century and earlier. Our box sash windows are handmade in our specialist factory and can be designed, developed and manufactured to suit your specific project requirements.

The classic yet timeless design of the traditional box sash window is a popular feature of many historical buildings dating back to the early 20th century and earlier. Our box sash windows are handmade in our specialist factory and can be designed, developed and manufactured to suit your specific project requirements.

Whether you are looking for a restoration or replacement traditional box sash window, we can provide you with traditional looking wooden 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. All of our windows are custom made and combine traditional timber horns and classic mouldings with counter-balance, pulley and cord systems for an authentic look and feel.

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
Internally Glazed with timber beads
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.
Glazing bars
Applied 18 & 22mm glazing bars to external faces of double glazed unit
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Traditional Box Sash Windows – Single
Traditional Box Sash Windows – Double
Traditional Box Sash Windows – Triple

How we create and fit a
genuine looking traditional
sash box window suite

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.

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 sash windows and doors.

High performance
for peace of mind

As well as capturing the traditional heritage look and being sympathetic to historic architecture, our box sash windows are engineered with 21st century energy efficient performance in mind, helping combat draughts and noise and heat loss problems.

Testimonial

Both the works and resident liason were an excellent standard and the works were successfully completed to programme and budgets.

COLIN DAVIES   ARCUS CONSULTING LLP

TRC and their subcontractors SLG have been a pleasure to work with and the final result of the finished works look absolutely fantastic

Hayley Jones   Great Places Housing Group

I want to express my thanks, on record, to the whole project team for your efforts on this scheme. The project ran smoothly throughout.

Nick Smith   John Burke Associates
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