Timber Windows - Keystone Supplies

All Our Timber Windows

Bespoke timber windows bring unmatched natural warmth, architectural distinction, and enduring character to any property. Handcrafted directly within our specialist joinery workshop, our sliding sash and casement collections combine traditional British timber proportions with modern thermal insulation, multi point security, and breathable weather resistant finishes. Whether you are sensitively restoring a listed period home or designing an ambitious new architectural residence, explore timber glazing built without compromise.

Timber Sash Windows

Handcrafted directly in our workshop, Keystone timber casements pair authentic British joinery aesthetics with modern thermal efficiency. Available in classic flush profiles or weather rebated stormproof designs, each window is built using multi layer engineered timber sections to stop warping, twisting, and sticking through changing seasons. Finished with breathable factory applied microporous coatings, dual perimeter draught seals, and concealed multi point locking, our casements deliver smooth everyday operation and enduring kerb appeal.

Double & Triple Glazing For All Timber Windows

Achieve exceptional thermal performance without compromising traditional timber proportions. Our bespoke wooden windows accommodate high performance double and triple glazed units featuring low emissivity coatings, warm edge spacer bars, and argon cavity fills to comfortably exceed UK Part L Building Regulations. From ultra slim heritage glazing designed for sensitive period restorations to acoustic laminated glass that shuts out road traffic, every glass unit is fitted with room side internal beading for maximum weather deflection and security.

Timber Casement Windows

Built to preserve the architectural character of Georgian, Victorian, and Edwardian properties, our timber sliding sashes pair historical joinery details with modern, draught free comfort. Individually made to measure, they feature slender meeting rails, sculptured sash horns, and your choice of traditional cords and weights or modern concealed spiral balances. Engineered timber frames and perimeter brush sealing eliminate rattles and heat loss, ensuring effortless vertical sliding and dependable security year after year.

Layers of pure and laminated timber counteract natural wood grain movement. By distributing structural tension across engineered layers, our timber frames resist twisting, warping, and seasonal sticking to guarantee smooth year round operation in homes across the UK.

Integrated multi point shootbolts, heavy duty espagnolette systems, and key locking fasteners engineered to meet rigorous PAS 24 and Secured by Design standards. Delivering robust physical defence against forced entry without compromising traditional timber aesthetics.

Individually handcrafted to your exact structural aperture dimensions, available in authentic flush sash or rebated stormproof casements. Tailored to satisfy strict local authority planning and conservation area requirements for heritage renovations and bespoke new builds.

Advanced double and triple glazed sealed units featuring low emissivity coatings and warm edge spacer technology deliver thermal values twice as efficient as standard glazing, easily surpassing UK Part L Building Regulations. Fitted with internal security beading from the room side to eliminate external pane removal.

Designed for historic character cottages and sharp contemporary residences alike. Fully customisable with authentic Georgian astragal glazing bars, leaded layouts, acoustic laminates, and decorative etched or stained glass patterns crafted to your exact design scheme.

Extensive collections of luxury architectural hardware, including precision British brassware by Samuel Heath alongside hand forged monkey tail handles, pear drop fasteners, and working peg stays to suit both period and modern interiors.

Endlessly customisable Timber Windows

From traditional sliding sash windows to authentic casements, every timber frame we build is tailored to your exact specifications. Explore limitless design freedom with sustainably sourced engineered hardwoods and pure timber, bespoke heritage colour palettes, custom glazing bar arrangements, and quality forged ironmongery. Experience the tactile quality, smooth operation, and exceptional joinery standards first hand by exploring the collection in our dedicated showroom.

Looking For Matching Timber Doors?

We have just the thing...
Check out our timber doors collection, from English front doors, to French and Bi-fold doors, Patio doors and Internal doors, we've got them all just a click away.