KLIS SASH WINDOWS
LONDON TIMBER SPECIALISTS
BELSIZE PARK | LONDON
Bespoke timber sash windows for Belsize Park’s Victorian and Edwardian properties. Double glazed, draught-free, and built to sit correctly within one of NW3’s most carefully protected streets.
Belsize Park was developed rapidly in the mid-Victorian era, and what it produced was some of the finest stucco-fronted villa stock in north London. Belsize Park Gardens, Belsize Square and Lancaster Grove are defined by their sash windows — and on streets where every facade follows the same rhythm, the quality of any window work tells immediately.
Every job we take on in Belsize Park is handled personally by Klis, Besi and the team. You won’t be passed to a call centre or handed to a subcontractor.
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Belsize Park stucco terraces and villas rely on repetition — same proportions, same window profiles, same rhythm from house to house. A replacement that deviates in any of these breaks the pattern. We measure from your existing frames and reproduce everything precisely so the new window fits the building and the street.
We measure from your existing frames and reproduce everything precisely so the new window fits the building and the street.
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Belsize Park has been a Camden conservation area since 1973, and Article 4 Directions apply across much of the neighbourhood. The area contains 44 Grade II listed buildings, and Camden’s design guidance sets specific expectations for timber profiles and glazing on period properties. We know the council’s requirements and can advise on what applies to your property before you commit.
We know the council’s requirements and can advise on what applies to your property before you commit.
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Survey, installation, finishing — all done by our own team. The same people on every job, with no work passed to third parties and no variation in standard.
LONDON TRUSTS KLIS SASH WINDOWS FOR HONEST & ACCURATE ADVICE
We’ll come out, assess your windows properly and give you a clear recommendation. No pressure, no upselling. Complimentary site 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.
When rot moves into the load-bearing timber, the frame can no longer do its job. Wood that gives or crumbles at the sill or corners has deteriorated past the point where repair makes sense — replacement is the only lasting solution.
Single-glazed sash windows account for a large proportion of heat loss in Belsize Park Victorian and Edwardian properties. Cold draughts at the frame, condensation on the glass or street noise carrying through easily are signs that double glazing will make a genuine and lasting improvement.
Binding sashes, failed cords and frames that have shifted out of alignment are typical wear in NW3's older properties. Where the window can no longer be operated or closed reliably, replacement is the more practical and lasting answer.
We visit your Belsize Park property, inspect your windows on-site and provide a written quote. No call centres, no pressure, no strings attached.
Your windows are crafted to your measurements and fitted by our own team, with minimal disruption to your property and household.
Old frames removed and disposed of, site cleared, every window tested before we leave. We remain available if anything requires attention after handover.
We install and repair timber sash windows across Belsize Park and the surrounding area. Unsure whether we cover your road? Drop us a message — we’ll confirm.
Call or message Klis Sash Windows to arrange a no-obligation chat and a complimentary visit to your Belsize Park home to talk through your sash window requirements.
No hard sell, no pressure — just honest guidance so you can decide what is right for your property
Repair is the right starting point when the main frame is still structurally solid — cord replacements, draught sealing, rattles and localised rot patches can all be fixed without a full new window. Where the core timber has deteriorated beyond repair, or where double glazing is the objective, replacement becomes the better route. We’ll give you an honest view after inspecting your windows in person, and we won’t push for replacement when repair is the more sensible option.
Yes. Belsize Park Victorian Italianate villas and later Edwardian and Arts and Crafts properties each have their own window proportions and detailing. We take all measurements from your existing frames and reproduce profiles, glazing bar layouts, meeting rail heights and overall dimensions with precision — whatever the original period or configuration, the replacements will match.
Yes. All our replacement sash windows can be fitted with sealed double-glazed units within traditional timber frames — better thermal performance and sound insulation without changing the period look. Camden’s conservation guidelines will influence what is acceptable on front elevations, and we can advise on this during your site visit. Triple glazing is available for properties on busier roads.
Yes. Belsize Park has been a Camden conservation area since 1973, and Article 4 Directions mean that window replacement will often require planning permission even for like-for-like timber work. The neighbourhood also contains 44 Grade II listed buildings, where Listed Building Consent is required for any external alterations. Camden’s design guidance is specific about profiles and materials. We’re familiar with the council’s requirements and can advise on what your property will need.
Two to four windows typically takes one to two days on site once the frames are made. For larger projects we plan the sequence carefully to keep any opening exposed for as short a time as possible. You’ll receive a clear timeline at the survey stage.
We use sustainably sourced African Sapele hardwood — chosen for its long-term stability and resistance to moisture and movement. All timber is pre-treated before installation. Kept painted on a five to seven year cycle, a quality timber sash window will serve a Belsize Park property for decades. We’ll go through the right maintenance approach at handover.
Yes. Old frame removal and disposal is included in every job at no additional charge. We protect walls, floors and finishes throughout, leave the site clean, and check each window operates and seals correctly before we sign off.
Pricing depends on window count, size, glazing specification and any conservation area or listed building requirements involved. As a guide, fully installed replacement sash windows start from around £1,200 per window. An on-site assessment is the most reliable way to arrive at an accurate figure — we’ll look at your windows and provide a written quote with no obligation to go ahead.
