Timber Sash Windows

We manufacture bespoke sash windows for traditional and period homes, as well as stylish new builds, leveraging our 40 years’ experience in their design and production. Providing characterful elegance and charm that would enhance any home, our sash windows also deliver much improved thermal efficiency and dependable weather performance.

Kingstone-House-Sash-Double    Priory-Farmhouse-Inside-Sashes    Priory-Farmhouse-Sash-Front


Our sash window range consists of both traditional and modern variations to suit the needs of different properties:

  • Box Sash Windows with Weights – with face applied glazing bars or full glazing beaded in.
  • Part Q Compliant Box Sash Windows – enhanced security and thermal efficiency for new residential properties.
  • Conservation Box Sash Windows – suited to conservation projects with face puttied slimline glazing or single glazing.
  • Spring Balance Sash Windows –the elegance of traditional sash windows with modern day operation.
Box Sash Windows - with weights

Our traditional box sash windows offer a modern-day version of a design classic, operated by cords, weights and pulleys to counterbalance the sashes in the traditional way.

The 58mm sash profile comes with face applied glazing bars or full glazing bars designed to replicate the appearance of period designs. Featuring double glazed units these windows provide a stylish appearance alongside much improved energy efficiency. 

Supplied with parting beads, draught excluders, concealed trickle vents and compatible ironmongery. Glazed with soft argon gas filled units with a U value as low as 1.2

Sash Windows - Part Q Compliant

Manufactured to Building Regulations our Part Q compliant box sash windows and spring balance windows meet the requirements of PAS24 security standards and are suitable for new residential dwellings. Sashes are 58mm thick with face applied glazing bars and ovolo or lambs tongue internal mould, rebated and beaded for double glazing.

To achieve Part Q compliance, units come with a choice of secure ironmongery including pullies, finger lift and sash fasteners, lockable sash stops and toughened glass designed to prevent potential break-ins. Glazing achieves a high thermal efficiency (U value of 1.2) helping to reduce utility bills.


Conservation Box Sash Windows

Our conservation box sash windows are designed to replicate the original windows found in listed buildings and conservation areas allowing for authentic replacement. Manufactured with quality timber using slim timber frames and sash sections, the windows are operated using the traditional method of weights and cords which counterbalance the sashes. Profiles, glazing bars and detailing are crafted to precisely match authentic period designs such as Georgian, Victorian, Edwardian or Queen Anne.

Features include internal lambs’ tongue mouldings and glazing bars alongside an external putty bead for an authentic finish. Single glazed or slimline double glazed with real glazing bars, our heritage sash windows are typically set back with the box hidden by the external brickwork in a rebated reveal, although sashes can be also be positioned close to the external wall with the box on show, finished with a timber mould.

Spring Balance Sash Windows

Our spring balance sash windows offer a modern alternative to the weight-based system and are most suited to properties free of conservation constraints. Spring-loaded mechanisms are situated each side of the sashes instead of cords and weights. The main benefit the spring balance is a smaller rebate, as springs are more compact than weights, boxes are not required each side.

Constructed from Sapele or Accoya with face applied glazing bars and an ovolo or lambs tongue internal mould. Sashes include parting beads, draught excluders, concealed trickle vents and energy efficient glazing with a pane U value as low as 1.2

Sash Ironmongery

Box sash windows are fitted with a choice of sash lifts, sash fasteners to lock the sashes in place and for added security lockable sash stops; and when weights are used sash pulleys.

There are many styles and finishes available when it comes to sash window furniture, many of which are shown on our website. Where a heritage finish is required options such as mottled antique brass, antique black and polished brass are available.

High Quality Standards

Our box sash windows recently passed stringent weather performance standards and are now certified to European and British standards EN14351-1 and BS6375-1, giving customers reassurance they can rely on them all year-round.

Sash Windows are covered by a robust 5-year warranty that covers the frame, sash, glazing and ironmongery. All windows are CE marked and conform to British Standards. Salisbury Joinery holds the Silver CMS mark which ensures quality standards, all windows are CE marked and conform to British Standards.