Sliding Sash

The traditional sliding sash window, available with concealed counterweight boxes or a slimline spring mechanism. Fully bespoke and customisable, the range spans everything from high-performance new build glazing to accurate heritage restoration, covering every application and planning requirement across two main types:
Overview of key features within the Sliding Sash collection. Alternative glazing options and configurations are available.
Type
Sash Depth
PAS24 / Part Q
Glazing
Glazing Bars
Operation
Box Sash
Classic
50mm
Yes
Vacuum glass – 20mm DGU
Face-applied, internally beaded
Cords & weights
56mm
Yes
Vacuum glass – 24mm DGU
Face-applied, internally beaded
Cords & weights
73mm
Yes
40mm triple glazed
Face-applied, internally beaded
Cords & weights
Conservation
50mm
No
Heritage vacuum glass – 18mm DGU
True glazing bars, externally glazed, hand-applied putty
Cords & weights
Period
44mm
No
4mm single glazed or Heritage vacuum glass
True glazing bars, externally glazed, hand-applied putty
Cords & weights
Spring Balance
Classic
50mm
Yes
Vacuum glass – 20mm DGU
Face-applied, internally beaded
Spring balance mechanism
56mm
Yes
Vacuum glass – 24mm DGU
Face-applied, internally beaded
Spring balance mechanism
73mm
Yes
40mm triple glazed
Face-applied, internally beaded
Spring balance mechanism
Conservation
50mm
No
Heritage vacuum glass – 18mm DGU
True glazing bars, externally glazed, hand-applied putty
Spring balance mechanism