Sash Window Repair and Restoration in Kew

Specialist timber sash window restoration across Kew, Richmond, Brentford and Ealing. Cord replacement, draught-proofing, re-glazing and secondary glazing — preserving original windows that are worth keeping.

Original Timber Sash Windows in Kew Are Worth Restoring — Not Replacing

The Case for Restoration Over Replacement

Kew's residential streets are home to some of the most intact Victorian and Edwardian housing stock in West London. The original timber sliding sash windows that define these properties are an architectural detail that contributes directly to their character, kerb appeal and conservation area compliance. Well-maintained, properly overhauled timber sash windows will outlast modern uPVC equivalents in longevity, and when draught-proofed will match them in thermal performance.

In Kew's conservation areas — and for listed buildings throughout the borough — replacement with double-glazed uPVC or aluminium units requires consent that will typically be refused where original timber windows survive. The correct approach is restoration: cord replacement, draught-proofing, rot repairs where necessary, re-glazing and secondary glazing for improved thermal and acoustic performance — keeping the original window doing its job for another fifty years.

Sash window cord replacement and overhaul on a period property in Kew

Common Problems — and What They Actually Mean

Most sash window faults are repairable without full replacement. Broken sash cords — the most common complaint — are resolved by re-cording with traditional waxed cotton cord, checking the cast iron weights and servicing the pulleys: a straightforward repair that fully restores smooth operation. Painted-in sashes require careful cutting back of paint from the channels and beads followed by lubrication and bead adjustment.

Rot is typically localised to the bottom rail and sill — the areas most exposed to standing water. In most cases this can be addressed through splice repairs using a matching timber species and epoxy consolidant, rather than full sash replacement. Only when structural integrity is comprehensively compromised is a new sash the appropriate response — and even then, a like-for-like timber replacement is always preferable to uPVC.

Draught-Proofing and Secondary Glazing: Real Thermal Performance

A well-fitted, professionally draught-proofed timber sash window achieves air infiltration rates comparable to a new sealed unit. Professional draught-proofing involves the installation of brush pile or woven mohair weatherstripping into precisely routed channels on the meeting rail, parting bead and pulley stiles — tight enough to eliminate draughts without creating resistance that prevents smooth operation.

Where improved thermal or acoustic performance is required beyond draught-proofing alone, slim-profile secondary glazing fitted to the room face of the reveal is the recommended approach for listed buildings and conservation area properties. Magnetic or hinged units in powder-coated aluminium or timber are virtually invisible from the street and provide a significant improvement in noise reduction — particularly relevant for Kew properties close to the A316 corridor or under Heathrow flight paths.

Secondary glazing installation behind a restored sash window in a Kew period property

Sash Window Restoration Across Kew, Richmond, Brentford and Ealing

Each area of West London brings its own planning context and property type. Our sash window restoration work is tailored to reflect both, from listed buildings in Kew to Edwardian semis in Ealing.

Kew

Kew village and the surrounding streets fall within conservation area designations. Replacement of original timber windows with uPVC requires approval that will typically be refused. We routinely advise Kew homeowners on their options and manage any required pre-application discussions with the council's conservation officer before works proceed.

Richmond

Richmond has a high concentration of listed properties where Listed Building Consent is required before any window works that affect the building's character. We are experienced in preparing the necessary documentation and ensuring our specifications satisfy the council's requirements for historic joinery.

Brentford

Brentford's Victorian terraced stock typically retains original sash windows in varying states of repair. We provide full overhaul programmes — cord replacement, draught-proofing, rot repairs and repainting — that return windows to full working order at a fraction of the cost of replacement.

Ealing

Ealing's Edwardian stock often features larger sash windows with decorative glazing bar arrangements. We restore these carefully, retaining any original glass where it survives and sourcing appropriate heritage replacement glass where it has been lost.

Our Sash Window Restoration Process

Every sash window restoration we undertake begins with an honest assessment of what each window actually needs — not a one-size-fits-all package. Here is how we approach the work from first contact through to completion.

1Window-by-Window Assessment

We inspect every sash window in the property, recording its condition, identifying specific faults and noting any planning constraints. You receive a clear report on what each window needs, with the scope and cost broken down individually so you can prioritise if required.

2Stripping, Cleaning and Rot Identification

Sashes are removed from their boxes, paint is stripped from channels and beads, and the full extent of any rot or damage is established. This step often reveals issues that are not visible with windows in situ — ensuring the scope of repair is correctly identified before work begins.

3Rot Repair and Timber Splice Works

Localised rot in bottom rails, sills and stiles is treated using epoxy consolidant and splice repairs in a matching timber species. Where a complete sash replacement is unavoidable, we manufacture a like-for-like timber replacement that matches the original in section size, profile and glazing bar arrangement.

4Re-Cording and Weight Servicing

All sash cords are replaced with traditional waxed cotton cord of the correct weight for the sash. Cast iron weights are inspected and adjusted or supplemented as required. Pulleys are cleaned, lubricated and replaced where worn. The result is a sash that runs smoothly and stays in any position.

5Draught-Proofing Installation

Weatherstripping channels are routed into the meeting rail, parting bead and pulley stile faces and fitted with brush pile or mohair seal. The sash is then hung, adjusted and tested for smooth operation before any glazing work proceeds.

6Re-Glazing, Priming and Decoration

Cracked or inappropriate glass is replaced using heritage drawn glass where the property requires it. All timber surfaces are back-primed before rehanging. External decorating — priming, undercoat and two finish coats in oil-based or water-based eggshell — completes the work. Secondary glazing units are fitted to the room face of the reveal as a final stage where required.

ARRANGE A SASH WINDOW ASSESSMENT IN KEW OR RICHMOND

If your Kew, Richmond, Brentford or Ealing property has sash windows that are stiff, rattling, draughty or showing signs of rot, a professional assessment will establish exactly what each window needs — and in the vast majority of cases, restoration is significantly more cost-effective than replacement.

Contact Inventive Designs to arrange a window-by-window assessment. We will give you an honest, itemised picture of the work each window requires, with no obligation to proceed.

Book a no-obligation assessment