Kitchen Extension in Kensington, W8
London service guide: Kitchen extensions.
Kitchen Extension in Kensington: What You Need to Know
Every kitchen extension project in Kensington is designed to respect the Kensington Conservation Area and the character of Georgian townhouses, stucco Italianate terraces, prime mansion flats. Our in-house RIBA architects handle RBKC planning applications, our chartered structural engineers specify any load-bearing work, and our directly-employed trades deliver the build under one fixed-price contract. We coordinate Building Control, Party Wall awards where needed, and all certifications through to handover.
Kensington falls within a conservation area, which means visible external alterations require careful design and often full planning permission. Our architects have extensive experience securing approvals in RBKC's conservation areas.
Our kitchen extension projects in Kensington are delivered by our in-house team of RIBA architects, structural engineers and specialist tradespeople. Every project is managed under a single fixed-price contract with no hidden costs.
W8 kitchens carry a particular problem: the grander the house, the further the kitchen tends to sit from the garden and the light. Kensington runs from its high street and the Notting Hill Gate edges through quiet cul-de-sacs, garden squares, white-stucco villas, mansion flats and mews houses, and in most of that stock the original kitchen was a service room — placed for staff, not for family life. A kitchen extension here is about correcting the plan: bringing the working heart of the house to the garden level and flooding it with daylight.
Consent shapes what the glazing and the rear elevation can do. RBKC describes the Kensington Conservation Area as the largest in the borough, with building ages running from early Georgian speculative development to the present day, and its Article 4 directions catch small-scale external changes — windows, doors, boundary walls — on streets including Kensington Square and Kensington Church Street. In a leasehold flat, freeholder or council approval and often a Licence to Alter cover the layout and services work a new kitchen involves.
On numbers, budget from £2,200–£3,500 per square metre of new area excluding VAT plus a £5,000–£30,000 kitchen supply allowance, with a side return band of £90,000–£120,000 excluding VAT.
Kitchen Extension in Kensington: Applied to the Local Stock
RBKC Article 4 directions withdraw permitted development rights for small-scale external changes — replacing windows and front doors, removing or rebuilding boundary walls, roof coverings and other front-elevation works — at properties listed on Kensington streets including Kensington Square, Kensington Court Place and Kensington Church Street, so those works need planning permission. London-wide cost band for rear extension — single storey: £71,250–£112,500 excluding VAT (Resi rear extension cost guide, Oct 2025).
Sources: RBKC - Article 4 Directions in Conservation Areas (register of directions by street) (2026); Rear extension — single storey (Resi rear extension cost guide, Oct 2025) (2026)
Designed Around the Kitchen
A kitchen extension succeeds or fails on decisions that have nothing to do with brickwork: where the island sits, how far the cook stands from the table, whether morning light reaches the worktop. So we begin with the kitchen brief and let the architecture serve it — the drainage run for an island sink, the ducting route for extraction and the rooflight positions are all fixed on the drawings before any structural design starts. These are the calls we resolve first.
- Layout & zoning — cooking, prep, dining and sitting areas arranged so the room works with six people in it, not just two
- Island engineering — water, waste and power routed through the new floor slab for island sinks and hobs
- Daylight strategy — rooflights and glazed doors positioned for even light over the worktop without summer overheating
- Extraction & ventilation — duct runs designed into the structure rather than boxed in as an afterthought
- Appliance services — electrical capacity, gas and water supplies checked against the appliance schedule early
- Storage & larder joinery — pantries and full-height cabinetry planned alongside the walls that hold them
- Levels & flooring — one continuous floor level from the original hallway to the garden doors
- Lighting design — layered task and ambient circuits, switched for cooking and for dinner
How We Run Your Project
Six stages, kitchen decisions first, so nothing gets value-engineered mid-build.
- Kitchen brief — how you cook, shop, eat and entertain, recorded before anyone sketches a wall.
- Layout studies — alternative plans tested against the brief until the strongest arrangement wins on evidence.
- Technical design & consents — cabinetry, services and structure coordinated on one set of drawings while the paperwork progresses.
- Single itemised price — building work, kitchen installation and services committed in one document before we start.
- Shell to weathertight — the new structure built and sealed, with service routes cast in exactly where the kitchen plan needs them.
- Installation & commissioning — cabinetry, appliances, stone and lighting fitted, tested and handed over snag-free.
Most kitchen extension builds run 10–16 weeks once on site. Read the full kitchen extension guide for layout options, glazing choices and programme detail.
The regulatory load on a kitchen extension is heavily service-driven: new cooking extraction must discharge correctly under the ventilation rules, relocated sinks need compliant drainage falls, kitchen circuits are notifiable electrical work, and large glazed openings must satisfy energy standards — all inspected and certified through building control, which we manage. The planning route itself depends on your street: consented, permitted development or conservation-area constrained. Check your borough’s position in our planning guide library.
Why Hampstead Renovations
A kitchen extension is really two projects — a build and a kitchen — and most go wrong where they meet. Ours are drawn by our in-house RIBA Chartered Architects with the cabinetry, structure and services on the same drawings, priced fixed on JCT terms, and built by teams we bring back project after project. RICS surveying support is available through our sister company where party wall or condition questions arise. Every contract carries £10M public liability cover, a 12-month defects period and a 10-year workmanship warranty. Call before 2pm on a weekday for a same-day response.
Kitchen Extension in Kensington: Questions
What should a kitchen extension in Kensington cost?
Work from the two-part London basis: £2,200–£3,500 per square metre of new floor area excluding VAT for the build, plus a kitchen supply allowance of £5,000–£30,000 for cabinetry, stone and appliances. In Kensington the supply allowance does real work — the specification gap between the bottom and top of that band is where most W8 briefs are decided.
Which Kensington properties take a kitchen extension well?
The range is wider than people expect. Kensington W8 spans the high street and Notting Hill Gate edges, quiet residential cul-de-sacs, garden squares, white-stucco villas, mansion flats and mews houses — and the right kitchen answer differs across all of them, from a garden-level rear addition on a villa to a clever internal re-plan where the envelope cannot move.
Will RBKC let me change the rear of my Kensington house for a kitchen?
Only on conservation terms. RBKC calls the Kensington Conservation Area the largest of the borough's conservation areas, with building ages from early Georgian speculative development through to the present day, and its Article 4 directions pull even small external works — replacing windows and doors, boundary walls, roof coverings — into planning on listed streets such as Kensington Square, Kensington Court Place and Kensington Church Street. The rear glazing a kitchen wants is designed for that scrutiny from day one.
We own a leasehold flat in Kensington — can we still remodel and extend the kitchen?
Frequently yes, but the consent route changes. Leasehold flats in Kensington need freeholder or council approval, and usually a Licence to Alter, precisely for the layout and services work a kitchen project involves — moving supplies, drainage and extraction as the room shifts. We sequence that alongside any RBKC application so neither consent stalls the other.
Is a side return or a wraparound better for a Kensington kitchen?
The side return — £90,000–£120,000 excluding VAT as a London band — suits houses that need width and light along the flank; a wraparound, at an indicative £100,000–£200,000, adds depth as well and effectively rebuilds the whole ground-floor plan around the kitchen. A single-storey rear extension at £71,250–£112,500 excluding VAT remains the simplest route where the garden elevation allows it.
Kitchen Extension in Nearby Areas
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