KLIS JOINERY & CARPENTRY LTD
LONDON TIMBER SPECIALISTS
WESTMINSTER | LONDON
Bespoke timber sash windows for Westminster’s Georgian and Victorian properties. Draught-free, double glazed, and crafted to the exacting standards that conservation in this borough demands.
Westminster contains some of the most architecturally significant residential streets in London. The Georgian townhouses of Marylebone, the stucco terraces of Belgravia and Bayswater, the Victorian mansion blocks of Pimlico — these are buildings where the sash window is not incidental but structural to the character of the whole street. Across 56 conservation areas, the standard of any window work is scrutinised closely.
Klis, Besi and the team attend every Westminster job personally. No call centres, no subcontractors.
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In Westminster, where conservation officers review window work closely, an incorrect profile or misaligned glazing bar creates problems beyond aesthetics. We work from your existing frames, replicating every dimension — horn details, meeting rail positions, sash weights — to ensure replacements pass scrutiny and sit correctly within the elevation.
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Westminster has 56 conservation areas, and Article 4 Directions apply across the vast majority of its residential streets. The council refuses uPVC as a matter of policy and requires timber frames with authentic profiles and sympathetic glazing. Westminster City Council assesses each application case by case — we know what officers look for and can advise on your property before you make any decisions.
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Survey, manufacture, installation — all handled by our own team throughout. You won’t be passed between different contractors, and the standard of work doesn’t change between jobs.
LONDON TRUSTS KLIS JOINERY & CARPENTRY FOR HONEST & ACCURATE ADVICE
We’ll come to you, look at your windows carefully and give you a straightforward view on what makes sense. No obligation, no upselling. Free home visit across London.
Bespoke timber sash windows built to your exact proportions and fitted precisely in period and contemporary homes.
Bespoke bay and box bay windows designed and fitted to suit your home’s proportions and style.
Modern sealed units fitted into traditional timber frames. More warmth, better noise reduction, lower energy costs.
Stop cold air, reduce heating bills, and eliminate rattles in the home without having to replace your existing windows.
Broken cords, rattling sashes, jammed frames, and more. We restore original timber windows to full working order.
Looking for high-quality, handcrafted timber windows only? We supply bespoke sash and bay windows to clients and trade.
Once rot breaches the surface and reaches the structural core, repairs stop being cost-effective. Timber that gives way at the sill or frame corners has lost the strength the window depends on — at that point, replacement is the correct course.
Westminster properties on single glazing lose a substantial proportion of heat through their sash windows. Cold air at the frame, condensation building on the glass, or the noise of central London carrying through are reliable signs that double glazing will make a material difference.
Sashes that have seized, cords that have snapped, frames that have racked out of square — familiar problems in Westminster's older residential stock. Where the window can no longer be operated or sealed reliably, replacement is the more durable long-term answer.
We visit your Westminster property, assess your windows directly and provide a clear written quote. No call centres, no pressure, no commitment required.
Your windows are built to specification and installed by our own team, with as little disruption to your property as possible.
Existing frames removed, the site left clean, each window tested before we leave. We're available if anything needs attention once the work is done.
We install and repair timber sash windows across Westminster and the surrounding area. Not sure if we cover your street? Get in touch — we’re happy to confirm.
Contact Klis Joinery & Carpentry to arrange a no-obligation conversation and a free home visit to discuss your timber sash window requirements.
We give clear, honest advice without any pressure — the decision is always yours to make.
When the main frame is structurally intact, repair is generally the right approach — cord failures, draughts, rattling and patches of surface rot don’t justify a full replacement. Where the core timber has deteriorated or double glazing is the goal, replacement becomes the more sensible route. We give you an honest assessment after inspecting your windows in person, and we won’t recommend more than the situation calls for.
Yes. Westminster’s conservation officers pay close attention to profile accuracy, so getting this right matters practically as well as aesthetically. We take all reference measurements from your existing windows and reproduce profiles, glazing bar configurations, meeting rail positions and proportions exactly — whether your property has Georgian six-over-six, Victorian two-over-two, or something less common.
Yes. All our replacement sash windows can be fitted with sealed double-glazed units within traditional timber frames, improving thermal and acoustic performance without altering the period appearance. Westminster City Council considers slimline double glazing on a case-by-case basis, and many applications are approved where the detailing is authentic. We can advise on what’s likely to be acceptable for your property.
Yes. Westminster has 56 conservation areas and one of the highest concentrations of listed buildings in England. Article 4 Directions apply across nearly all residential conservation streets, and Westminster City Council operates a strict policy — uPVC windows are refused as standard, and all replacement work must use timber with profiles that match the original. Listed buildings require Listed Building Consent in addition to any planning permission. We’re experienced with Westminster’s requirements and can advise on what your property will need before you begin.
Two to four windows typically takes one to two days on site once the windows are manufactured. For larger projects we plan the sequence carefully to limit the time any opening is left exposed. A clear programme is provided at the survey stage.
We build with sustainably sourced African Sapele hardwood, selected for its stability and performance in the UK climate. All timber is pre-treated against moisture and movement before installation. Repainted on a five to seven year cycle, a well-made timber sash window is a long-term investment — we’ll advise on the right maintenance approach at handover.
Yes. Removal and disposal of old frames is included as part of every job — there are no additional charges for this. We take care of surrounding finishes and surfaces throughout, leave the site clean before we go, and check every window fully before signing off.
Price varies with window count, size, glazing specification and the level of conservation area or listed building complexity involved. As a general guide, fully installed replacement sash windows start from around £1,200 per window. A free home visit is the most accurate way to arrive at a firm figure — we’ll assess your windows and provide a written quote with no obligation to proceed.
