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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:
Box Sash
Spring balance
Box Sash Window
The traditional sliding sash window with concealed counterweight boxes, ideal for heritage restorations and period properties requiring authentic detailing.

Box Sash Window
Classic
Key features
- Cords & weights
- Face applied glazing bars
Glazing
- 50mm Vacuum glass – 20mm DGU
- 56mm Vacuum glass – 24mm DGU
- 73mm 40mm triple glazed
Specification
- A variety of timber specifications available
- A variety of glazing specifications available
Performance
- PAS24 Tested

Box Sash Window
Conservation
Key features
- Cords & weights
- True glazing bars
- External putty bead: hand applied
Glazing
- 50mm Heritage vacuum glass – 18mm DGU
Specification
- A variety of timber specifications available
- A variety of glazing specifications available
Performance
- PAS24 Not Applicable to This Range

Box Sash Window
Period
Key features
- Cords & weights
- Slim timber frames and sash sections
- True glazing bars with external putty beads
- Internal mouldings: period accurate
Glazing
- 44mm 4mm single glazed or Heritage vacuum glass
Specification
- A variety of timber specifications available
- A variety of glazing specifications available
Performance
- PAS24 Not Applicable to This Range
Spring Balance Sash
The spring balance sash trades cords and weights for a slimline spring-loaded mechanism, offering a lower-maintenance alternative to the traditional box sash. Suitable for properties free of conservation constraints.
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Spring Balance Sash
Classic
Key features
- Spring loaded mechanism
- Face applied glazing bars
Glazing
- 50mm Vacuum glass – 20mm DGU
- 56mm Vacuum glass – 24mm DGU
- 73mm 40mm triple glazed
Specification
- A variety of timber specifications available
- A variety of glazing specifications available
Performance
- PAS24 Tested

Spring Balance Sash
Conservation
Key features
- Spring loaded mechanism
- True glazing bars with external putty beads
Glazing
- 50mm Heritage vacuum glass – 18mm DGU
Specification
- A variety of timber specifications available
- A variety of glazing specifications available
Performance
- PAS24 Not Applicable to This Range
Summary
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
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