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.
LONDON TRUSTS KLIS JOINERY & CARPENTRY FOR HONEST & ACCURATE ADVICE
We’ll visit, assess your windows honestly, and tell you which option makes sense. No upselling. No obligation. Free home visit across London.
We’re a family-run timber window specialist serving homes across London, including Hammersmith & Fulham, Camden, Hampstead, Shepherds Bush, and Islington.
We’re not a franchise, and you won’t speak to a call centre. Expect Klis, Besi and the team to visit every job personally.
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We’ll tell you if a repair is the right answer. We won’t recommend a replacement if it isn’t needed — and we’ll explain exactly why, in plain English.
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We work regularly on listed buildings and in conservation areas across London. We know what’s permitted, understand regulations, and can advise you before you commit to anything.
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Old frames out, site left spotless, every window tested before we leave. We treat your home with respect throughout.
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Get in touch however suits you. We’ll ask a few questions about your windows and arrange a convenient time to visit. No call centres, no obligation.
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Old frames are removed, the site is left spotless, and every window is tested before we leave. We’re on hand if you need us — the job isn’t done until you’re happy.
Our windows come standard with a 10-year guarantee on all workmanship and glazed units.
GOOGLE REVIEWS
CHECKATRADE
★★★★★
Super helpful and efficient. Responded to my query immediately and came over on the weekend. Job was more complicated than it should have been but they cracked on no fuss. Would absolutely recommend
Verified Checkatrade Review | NW6
★★★★★
Klis Joinery recently replaced 5 sash windows at our property and we were delighted with the service.The price was fair compared to other quotes we got.Klis and his team were. Very friendly and professional,and the communication was great both in the lead and during work.We’re very happy with the finished result and wouldn’t hesitate to recommend them
Verified Checkatrade Review | W8
Serving homeowners across London
We install replacement sash windows across central and west London. Not sure if we cover your area? Call or message us — we’re happy to advise.
Get in touch
Yes — this is central to what we do. We replicate original profiles, glazing bar layouts, meeting rail positions and proportions exactly so that replacement windows are indistinguishable from the originals. Whether you have Victorian two-over-two sashes, Edwardian six-over-six, or something more unusual, we work from your existing windows to ensure the replacements are a precise match.
Yes. All our replacement windows are available with modern sealed double-glazed units fitted into traditional timber frames. This gives you significantly better thermal performance and noise reduction while keeping the period appearance intact. Triple glazing is also available for properties on particularly busy roads or where maximum insulation is a priority.
Yes, we have extensive experience working within conservation area guidelines and on listed properties across London. Permitted development rules vary by borough and listing status — we can advise you on what’s likely to be approved before you commit to anything, and we’re familiar with the typical requirements around timber frames, slim-profile double glazing, and matching original designs.
For a typical residential job — two to four windows — we’d normally complete the work in one to two days after the windows have been crafted. Larger projects covering a full property are planned carefully to minimise the time any opening is exposed. We’ll give you a clear timeline when we visit, and we keep disruption to a minimum throughout.
We use high-quality, sustainably sourced African Sapele hardwood selected for stability and longevity. All timber is treated before installation to resist moisture, rot and warping. Properly maintained — painted every five to seven years — good quality timber windows will last decades. We can advise on the best finish and maintenance routine when the job is done.
Yes, always. Removal and full disposal of old frames is included as standard — there are no hidden charges for this. We protect surrounding walls, floors and finishes during installation, and we leave every work area clean and tidy before we go. We also test every window before we leave to make sure it opens, closes and seals correctly.
Costs vary depending on window size, number of windows, glazing specification and any complexity around period matching or conservation requirements. As a general guide, most replacement sash windows start from around £1,200 per window fully installed, depending on the size and configuration. The best way to get an accurate figure is a free home visit — we’ll assess your windows, discuss your requirements and provide a detailed written quote with no obligation to proceed.
