Bespoke Timber Sash & Casement Windows

Perfect made-to-measure wooden sliding Sash Windows and Casement Windows to suit your home's age and style.

Discover our Bespoke, Traditional Timber Box Sash and Flush Casement Windows

We build and supply complete new sash windows or casement windows. Alternatively, if the boxes/frames are in good condition and you want to upgrade your existing windows with double glazing or acoustic glass, we can supply new sliding sashes or casement sashes to fit into the original frames

Bespoke, Traditional Design

When you commission Timberglaze to make your replacement windows you can be confident, knowing that we can replicate any original detailing with our comprehensive range of tooling in-house. If you are replacing historically inappropriate windows we can come up with a design to fit in with the vernacular. We also work to architects drawings.

Our joiners have extensive experience in producing all types of joinery including multi-paned, curved on plan, arches and radial work.

All of our timber windows are made to meet requirements of building regulations or listed building consents.

Georgian, Victorian, & Edwardian Sash Windows

With an eye to period detail, we can provide modern windows that match the Georgian, Victorian, and Edwardian era designs of your home.

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Some Of Our Work

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The Timber

We believe that new timber windows are a long term investment and should stand the test of time, which is why we use the best available materials. Our default timber is Accoya which is sustainable and has an unrivalled lifespan. Accoya is very dimensionally stable, offers better thermal insulation than tropical hardwoods and extends the maintenance cycle of the paint finish. It is also resistant to water penetration through the cross grain which helps ensure the longevity of double glazing.

We will of course consider other timbers if specified. Find out more about accoya wood.

Discover more about why we use Accoya

About Our Slimline Glazing

We generally use individual slimline insulating units with a 6 mm cavity. These have an inner pane of Low E glass and are filled with an inert noble gas (Krypton, Krypton/Xenon mix or Xenon depending on the u value required) to optimise the insulation property. The units can be manufactured with a 6 mm or 8 mm sight-line (perimeter margin) which means glazing bars can be made down to as little as 17 mm wide and still accommodate double glazing. 

(Larger units over 0.65m2 may need a wider cavity, to reduce the chance of the glass flexing and causing the phenomena known as newtons rings)

These units have a discreet warm edge spacer bar available in white, black or grey. The spacer bar is impregnated with a desiccant to absorb any ambient moisture. The spacer is a a silicone tape which reduces thermal bridging between the inner and outer pane which in turn means there is less likelihood of condensation around the inside pane of glass.

Slimline units are ideally suited for use in period properties and listed buildings (subject to consent) because it is difficult to distinguish them from single panes. We have had a good success rate getting consent but each case is evaluated on its own merit so you should always seek advice.


Timberglaze avoids using inappropriate stuck on timber beads but where there are multiple panes and the cost of using individual panes falls outside of budget we have developed our Sashplex system. This system uses one double glazed insulating unit per sash which has a matrix of spacer sandwiched within the unit. The inner glazing bar mouldings are jointed, but externally a timber web is applied, this web is then has a traditional putty line applied to it which is then hand painted. This gives a traditional appearance that cannot be distinguished as not being individual units.

Single glazing can be specified when dictated by conservation planners.

Different Glass Available

We can glaze with most available types of glass, including  restoration glass, acid etched, laminated, acoustic laminated, toughened safety glass, patterned glass, self-cleaning glass and  pyro-glass. All can be incorporated into sealed units.

The Finish

Windows are normally supplied fully painted in a low maintenance semi-gloss finish that has been spray applied. RAL Code 9016 white is our standard colour but you may select a colour of your choosing. If you need a two colour finish or a different colour inside and out this can be done but will attract a 5% surcharge to cover the extra work; alternatively we can leave the inside primed and undercoated to a high standard ready for finishing on site by others.

We use Sikkens Rubbol as our preferred paint system which has proven to have a maintenance cycle in excess of 10 years in normal conditions.

The Fittings

We carry a range of good quality fittings in various styles and finishes

Sliding Sash Windows

Our timber sliding sash windows are hung with wax cotton/polypropylene cords, weights and roller bearing pulleys. Where this is not practical we can use spring balances.

We normally supply windows with a fastener, 2 ventable security stops and optional Sash Lifts.

Casement Windows and French Casement Windows

Our traditional flush casement windows are hung with washered brass or roller bearing hinges and come with a casement stay and fastener and  means of locking.

If the above specifications do not meet your requirements and you need something different such as friction hinges, tilt and turn, shoot bolts, fire egress, flying mullions etc. we can help.


All our windows are fully weatherstripped.

Contact Us

Call us on 01761 470870 or fill out this form and a member of our team will be in touch with you to discuss your requirements.

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