Conservation Historic Single Glazed Box Sash Window

Historic vertical sliding sash windows with period sightlines and details, in module sizes or made to measure. The single glazed windows are designed for replacement of originals in existing buildings and listed where double glazing is not suitable.

The window is subject to planning approval as it will not meet current building regulations.

General information


One coat spray applied primer

Uniclass 2015

Pr_30_59_98_96 Wood window unitsPrimary


L10/10 Wood windows

L10/210 Wood windows

Specification data - Wood window units

Product Reference

Conservation Historic Single Glazed Box Sash Window


Engineered Accoya

Recommended for coastal areas.

Engineered clear grade knot free Siberian Larch frame with Accoya sashes and internal/external liners and Hardwood Sapele Sill

As standard.

Engineered Hardwood Red Grandis

Sill section (height x depth)

68 x 143 mm

90 x 143 mm

Sill projection

35 mm

60 mm

85 mm

110 mm

140 mm

90 x 143 mm sill required.



Not required

As drawing


Not required



Lambs tongue


Glazing bars

18 mm Gothic bar

18 mm Georgian Ovolo

18 mm Victorian Lambs tongue

32 mm Georgian Ovolo

40 mm Queen Anne Ovolo


4 mm Period style Victorian sheet glass

4 mm Toughened single glass using traditional hand-faced putty


Brass sash catch, sash lifts, sash lock, sash pulley

Croft ironmongery with bespoke finish

Insert requirement.

Polished chrome sash catch, sash lifts, sash lock, sash pulley

Satin chrome sash catch, sash lifts, sash lock, sash pulley

Standard product features


Engineered clear grade knot free timber, all FSC certified. Chain of Custody can be specified.

Frame section (liner width x depth):

95 x 140 mm.

Sash section (width x depth):

44 x 44 mm with a 94 mm bottom rail and 35 mm midrail.

Staff bead:

Timber glued and pinned.

Parting bead:

Click fit removable parting bead.


One coat spray applied primer.


Full standard with Sashglide® acoustic weatherpile.


4 mm toughened single glazed using traditional hand-faced putty. Kitemark will be apparent on glass in accordance with Building Regulations.


Pre stretched nylon cords with sash weights and heavy duty pulley wheels.

Product Options


Include specific frame dimensions, configuration and glazing bar designs with specification. Provide drawings if available.

Feature windows:

Shaped or curved on plan frames can be made to Mumford and Wood sections and details.

Third party certifications
  • Timber FSC Certified
  • ISO 9001
  • ISO 14001
  • British Woodworking Federation Member
  • Timber Window Accreditation Scheme Approved Manufacturer
  • Wood Window Alliance Founding Member
  • CE Marked
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