The starting condition on a Hammersmith terrace is almost always the same: a narrow back kitchen, often in a closet wing or scullery, cut off from the reception rooms and looking onto a slim side-return alley rather than the garden. It is a dark, cellular room that fights the way families now use the ground floor, with the cooking squeezed into a space the original house never intended to be lived in. The kitchen extension is the project that resolves it — not by adding a generic box, but by re-planning the whole rear of the house so the cooking, eating and sitting space becomes one room that faces the garden. Everything else in the scheme, from the structure to the glazing to the position of the doors, follows from that single objective, and the design starts by mapping how the existing rooms actually connect, where the level changes fall, and which walls are doing structural work.
The defining move on this stock is the wrap-around, or L-shaped, footprint. Infilling the side-return alley widens the plan sideways into the return, while a modest rear projection carries it toward the garden; combined, they give a genuinely wide, square kitchen-diner rather than the long, thin galley that a side-return alone produces. The geometry is what we resolve first, because it fixes where the island, the run of units, the dining table and the doors to the garden can sit, and whether the cook faces the room or the wall. We test the two elements together — how deep the rear can push before it erodes the garden, how far the return can widen against the boundary, and where the retained reception room hands over to the new space — so the internal room, not just the outline, drives the plan. Get that corner right and the same footprint that would read as a corridor instead reads as a generous, single family kitchen.
Making one room out of two or three means opening up the ground floor structurally. The original rear wall and the side-return wall are load-bearing, so removing them to create a clear span usually needs a steel frame — a goalpost arrangement of beams and posts — designed and calculated by a structural engineer to carry the floors and, on a terrace, the party walls above. A chimney breast or spine wall often has to be worked around or removed on its own supports. Because those beams typically bear into the walls shared with the neighbours on either side, this is where the kitchen extension and the Party Wall etc. Act 1996 meet, and we coordinate the two from the start. The engineer's calculations, the size of the beams and the padstones they land on all feed back into the ceiling height and the run of any bulkhead, so the structure is designed with the finished room in mind rather than bolted on afterward.
Once the kitchen extends both back and sideways, the centre of the new plan sits a long way from any wall window, and a badly lit deep room is the commonest failing of these extensions. The daylight strategy is therefore part of the architecture, not an afterthought. We work rooflights or a glazed lantern into the flat roof over the deepest part of the plan, use full-height glazed doors across the rear to pull the garden light in, and keep the return open to the retained room so light travels through rather than stopping at a wall. The roof section is set to drop light where the plan is darkest, which on a north-facing garden is what decides whether the room feels bright or cavernous. We also weigh the position of each rooflight against the structure below, so glazing lands between the beams rather than fighting them, and against solar gain, so a south-facing lantern brings light without turning the kitchen into a greenhouse in summer.
A kitchen extension is also a services project, and this is where it differs most from a plain room addition. The sink, dishwasher and any island tap need new drainage runs coordinated with the existing soil stack; extract ventilation for the hob has to be routed out without scarring the rear elevation; and underfloor heating usually replaces the radiators that a wall of glazing leaves nowhere to put. The new floor slab and the flat roof have to meet current standards for insulation, damp-proofing and, at the garden threshold, water resistance so a flush level access does not let water in. Where an island carries a hob or sink, those services have to cross the new slab and be set out before it is poured, which is one more reason the layout is fixed early rather than left to the fit-out. We set all of this out in the building regulations package so the finished kitchen works as well as it looks.
The route through is a coordinated one and we keep it non-promissory. We survey the house and its rear, agree the wrap-around plan and the daylight strategy, then confirm the planning position for the exact address — whether a conservation area or an Article 4 direction applies, and, for a flat or maisonette, whether freeholder consent and a lease check are needed before anything else. From there we prepare the drawings a case officer can support, and once the principle is settled, the structural and building regulations package for construction. On a closely built terrace the party wall neighbours are identified early, and a builder is brought in against a clear technical package so the price reflects the real scheme rather than an optimistic sketch. The result is the kitchen your household actually wants, delivered without unbalancing the period house it sits within.
