A kitchen project in St John's Wood is really two different jobs, and which one you have depends less on your taste than on your tenure. If you own a house — a villa off one of the avenues, a stucco-fronted period house, a terrace with a rear closet wing — the kitchen usually grows outward into a rear, garden-facing extension, and the work is a planning and structural exercise. If you own a mansion-block or converted-villa flat, there is no outward to grow into: the kitchen is relocated or rebuilt inside a fixed demise, and the work becomes a lease, acoustic and services exercise governed by a freeholder rather than by Westminster. We establish which project you actually have before drawing anything, because the two follow entirely different consent routes and fail in entirely different ways.
Extraction is the constraint that most often reshapes a kitchen design here, and it is the one homeowners think about last. A recirculating hood needs no route out of the building; a ducted extract that genuinely clears steam and cooking smells needs a continuous run of ductwork to an external terminal, at a diameter that does not throttle the fan. In the solid masonry of a period St John's Wood house there is no cavity to hide that duct in, so the route has to be plotted through the structure — around new beams, above ceilings, or up through the flat roof of the extension itself — while the design is still fluid. Approved Document F governs the extract and background ventilation a kitchen must provide, so the hob position and the duct route are settled together rather than in sequence.
Where the sink, dishwasher and any utility appliances land is a drainage question before it is a layout question. Moving a kitchen away from the wall carrying the existing soil stack means the waste has to travel further to reach it, and every extra metre has to be bought with fall — a gradient that must fit inside the floor zone you actually have. That zone is contested: insulation, a screed, underfloor-heating pipes and the waste runs all want the same depth, and in a new kitchen extension the finished floor level is pinned at both ends, meeting the existing floor inside and reaching a workable threshold to the garden outside. We set the build-up and the falls at the same time as the plan, because an island sink that cannot be drained is discovered on site, not on a mood board.
Opening the back of the house so the old kitchen and the new extension read as one room is the structural heart of the job. Removing a rear wall usually means a beam, and often a goalpost frame with columns and padstones taking the load down to new foundations — and on a semi-detached villa or a terrace, the bearing at one end lands in the party wall, which brings the Party Wall etc. Act 1996 into the programme alongside any excavation within three or six metres of a neighbour's structure. The detail worth resolving early is whether that beam sits down into the room or flush within the ceiling. A flush beam gives a clean, uninterrupted ceiling, but it competes for the same depth as the extract duct, the lighting and the downlight void, so the two must be coordinated rather than left to collide on site.
In a mansion-block or converted-villa flat the kitchen cannot be extended, so the project is to move it: out of a small back room and into the living space, or into a better-lit part of the plan. That is a lease matter first. Freeholders and managing agents in St John's Wood typically require a Licence to Alter supported by drawings, and their surveyor will look hard at structure, acoustic separation between dwellings, and fire. Leases frequently restrict placing wet areas over a neighbour's habitable rooms, so the lease should be read before a new sink position is committed to. The practical constraints follow from that: the waste has to reach an existing soil stack at a workable fall, the extract has to find a route out the freeholder will accept, and the floor build-up has to carry an acoustic layer the block is satisfied with.
The planning question on a kitchen extension is narrower than owners expect, and it is not really about the kitchen. Most of St John's Wood sits within the City of Westminster and within a conservation area, which commonly restricts the permitted development rights a rear extension might otherwise rely on, so a householder application — determined in around eight weeks — is the normal route, and the correct authority should be confirmed for the exact address because a Camden-administered edge runs along Boundary Road, Greville Place and the Abbey Road fringe. What a case officer assesses is the rear elevation, the neighbour's daylight and the garden setting, plus the small external items a kitchen brings with it: the extract terminal, the rooflights, and any condenser or plant. Those are the details worth resolving before submission, not after.
Finally, the room has to work as a kitchen. A wall of glass to the garden is the usual ambition, but building regulations limit the heat loss an extension may carry, so a fully glazed rear elevation generally has to be justified by a calculated trade-off elsewhere in the fabric rather than simply drawn. Orientation matters as much as area: a large glazed kitchen facing the afternoon sun can overheat, and shading, rooflight position and glass specification are better answers than shrinking the opening until the drawings look cautious. Inside, the island is usually what decides whether the room feels generous or merely large, so we test its position against door swings, the route out to the garden, the sightlines from the dining end, and where a utility or pantry can absorb the noise and clutter the main space should not have to.
