KLIS SASH WINDOWS
LONDON TIMBER SPECIALISTS
ARCHWAY | LONDON
Bespoke timber sash windows for Archway’s Victorian and Edwardian terraces. Double glazed, draught-free, and fitted to uphold the period character of N19’s most sought-after streets.
The streets around Whitehall Park and Dartmouth Park — Harberton Road, St John’s Villas, Bickerton Road — are among the most architecturally coherent Victorian terraces in north London. Sash windows run the length of these streets, and the conservation areas that protect them are actively enforced. On roads like these, the choice of who does the work matters.
You deal directly with Klis, Besi and the team on every Archway job — no intermediaries, no subcontractors, no one passed the work on.
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Archway’s Victorian terraces were built to a tight, repetitive pattern — the same profiles and glazing bar layouts from house to house along each road. One window that deviates in proportion or detail draws the eye immediately. We work from your existing frames and reproduce everything precisely so that replacements slot in without notice.
We work from your existing frames and reproduce everything precisely so that replacements slot in without notice.
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Much of Archway’s period residential stock falls within Islington’s Whitehall Park Conservation Area (CA7), with Article 4 Directions removing permitted development rights. Islington actively enforces timber sash window requirements — uPVC replacements have been subject to enforcement action on these streets. We know the council’s position and can advise on what applies to your property.
We fully understand planning permissions and building regulations,and can advise on what applies to your property.
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The same team handles everything from survey to final check — no outsourcing, no variation in who turns up or the standard they work to.
LONDON TRUSTS KLIS SASH WINDOWS FOR HONEST & ACCURATE ADVICE
We’ll take a look at your windows in person and give you an honest steer on what makes sense. No obligation, no hard sell. A free site visit anywhere 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 deterioration moves past the surface and into the structural timber, no repair is worth doing. Wood that gives at the corners or sill has lost the integrity the window depends on — replacement is the only option that lasts.
In Archway's Victorian and Edwardian homes, single-glazed sash windows are often the main route for heat loss. Draughts at the frame, condensation building on the glass, or traffic noise from Archway Road carrying into rooms are all signs that double glazing will deliver a worthwhile and lasting improvement.
Jammed sashes, failed cords and frames that have moved out of square are common issues in N19's older stock. When a window no longer opens freely or closes without a gap, replacement becomes the more durable long-term choice.
We come to your Archway property, look at your windows on-site and provide a detailed written quote. No pressure, no obligation, no middlemen.
Your windows are made to specification and installed by our own team, keeping disruption to your home as brief as possible.
Old frames removed and cleared away, the site left tidy, every window checked before we go. We stay reachable if anything comes up after the job is done.
We install and repair timber sash windows across Archway and the surrounding area. Not sure whether we cover your road? Send us a message and we’ll confirm.
Get in touch with Klis Sash Windows to arrange a no-obligation discussion and a no-charge home visit to talk through your timber sash window requirements.
We give you a straight, honest view — no pressure applied, no decision expected on the day.
When the frame itself is structurally sound, repair is the logical starting point — cord replacements, draught treatment, rattles and surface rot can all be tackled without a full replacement. Where the core timber has deteriorated past the point of reliable repair, or where upgrading to double glazing is the goal, replacement is the better option. We’ll give you an honest assessment at an on-site visit and won’t suggest more work than the situation calls for.
Yes. Archway’s Victorian terraces have consistent window types — typically two-over-two or three-over-three sash configurations — and any deviation is noticed, not least by Islington’s enforcement team. We record all dimensions and details from your existing frames and reproduce profiles, glazing bars, meeting rails and proportions exactly so replacements are an accurate match.
Yes. All our replacement sash windows can be specified with sealed double-glazed units in timber frames — better thermal performance and sound reduction without altering the period appearance. In Islington’s conservation areas, double glazing on front elevations requires planning permission. We can help you understand what’s needed and what’s likely to be approved. Triple glazing is also an option, particularly worth considering for properties on Archway Road itself.
Yes. Much of Archway’s period residential stock sits within Islington’s Whitehall Park Conservation Area (CA7), where Article 4 Directions mean that planning permission is required for most external window work — including like-for-like timber replacements. Islington actively enforces these requirements: uPVC window replacements on these streets have been subject to formal enforcement action and required reinstatement of original timber sashes. We know what the council expects and can advise before you start.
Two to four windows typically takes a day or two on site once the frames have been made. Larger projects are scheduled to limit how long any opening stays exposed. A clear programme is agreed at the survey stage and we work to it.
We use sustainably sourced African Sapele hardwood — a species well suited to the UK’s variable climate, with good stability and natural resistance to moisture. All timber is treated before fitting. With a fresh coat of paint every five to seven years, a well-made sash window will last for decades in an Archway property. We’ll cover the maintenance routine at handover.
Yes, always. Disposal of old frames is part of the job — no extra charge. We look after surrounding walls, floors and finishes throughout the work, leave the area clean, and test every window before we leave to confirm it opens, closes and seals as it should.
The price depends on window count, size, glazing specification and the requirements of any conservation area consent. As a starting point, fully installed replacement sash windows begin from around £1,200 per window. The surest way to get an accurate figure is a no-obligation home visit — we’ll look at your windows and produce a written quote you can consider in your own time.
