A kitchen extension in Barnes is really a question about one room and its relationship to the garden. On the cottages around the pond, the terraces off Church Road and the Edwardian houses behind the Common, the existing kitchen is often a narrow rear room or a tacked-on lean-to that turns its back on the garden and leaves the household cooking in a corridor. The move that changes daily life is not simply more floor area but a garden-facing kitchen-diner where cooking, eating and sitting share a single bright space and open directly outside. We start by understanding how the household actually uses the back of the house — where they eat, how they entertain, where the utility and storage need to go — because that brief dictates the plan long before massing or footprint does.
Getting daylight deep into the plan is the technical heart of the job, and it is what most distinguishes a kitchen extension from a plain rear addition. A period terrace or cottage is narrow and long, so a new kitchen at the back can easily become the darkest room in the house if it relies on garden doors alone. We work the section as hard as the plan — rooflights or a glazed lantern set over the cooking and dining zone, a full run of glazed doors to the garden, and where possible a sightline kept open from the front of the house straight through to the garden beyond. On the larger Castelnau villas the rooms are more generous but often equally dim at the back, so the same section-led daylight strategy applies at a different scale.
The threshold to the garden is where a Barnes kitchen is won or lost. Where a house sits above its garden, or steps down to it — and where a riverside position near the Terrace adds damp and level change — that threshold shapes the whole design. A flush, level threshold from the kitchen floor out to a terrace transforms how the room is used, blurring the line between inside and garden, but it has to be detailed carefully against the damp-proof course, the external ground level and the drainage so that water is kept out rather than channelled in. We resolve the finished floor level, the door threshold and the fall of the external paving together as a single detail, because a kitchen that opens cleanly and dry to the garden is the whole point of the extension.
How the new kitchen joins the existing house matters as much as the extension itself. Forming an open kitchen-diner usually means removing part or all of the original rear wall, and often a chimney breast as well, which is structural work: a beam has to carry the load above across the new opening, sized and calculated by a structural engineer to keep the storeys above properly supported. On a terrace or semi that beam frequently bears into the party wall, engaging the Party Wall etc. Act 1996. We plan the structure so the finished room reads as one generous, continuous space while the loads are quietly and properly resolved, and we coordinate the neighbour notices before work starts rather than discovering them halfway through the build on site.
A kitchen extension is a servicing project as well as a spatial one, which is what sets it apart from a plain rear addition. The new room needs foul drainage for the sink, dishwasher and any utility fittings tied back to the existing run at the right falls; mechanical extraction ducted to deal with cooking smells and moisture; and, under a large area of glazing, a considered heating and comfort strategy — usually underfloor heating paired with careful attention to solar gain — so the room is neither cold in winter nor overheated on a bright summer afternoon. We design these systems into the drawings early, because they influence the floor build-up, the ceiling void and the roof profile, not just the position of the kitchen units, and retrofitting them late compromises the finished room.
From there the route is a coordinated one. We survey the house, test the kitchen extension against Richmond's planning and daylight considerations and, where relevant, the character of the Barnes Green or Castelnau conservation area, then develop a design a case officer can support before producing the planning drawings and any supporting statement. Once the principle is settled we prepare the building regulations package covering structure, drainage, ventilation, insulation and the glazed garden threshold, and we identify notifiable neighbours under the Party Wall etc. Act 1996 so notices are served in good time. The result is a garden-facing kitchen-diner that brings light and connection to the back of a Barnes house without unbalancing the original building or crowding its garden setting.
