A kitchen extension in Golders Green begins with an honest look at what is already at the back of the house. On a bay-fronted Edwardian, the original kitchen usually sits in the rear back addition — a narrow, single-aspect room with a modest window and a door that opens awkwardly onto the garden. On a 1920s or 1930s semi-detached or detached house, the kitchen is more often a separate room at the rear beside a dining room, in a plan with the generous ceiling heights that make this stock worth working with. Those two conditions want different answers. One brief is solved by absorbing the back addition and squaring the rear off; another needs no extension at all, only the rear wall opened up and the ground floor re-planned around it. We diagnose which of those you are actually dealing with before a footprint is drawn, because the wrong starting assumption is what makes a kitchen project expensive without making it better.
What stands behind the house then sets the footprint. Golders Green's homes are known for mature gardens and tree-lined streets, and Barnet states that trees in conservation areas are protected by law — works affecting a protected tree can require prior notice or consent, entirely separately from any planning permission for the extension itself. A mature tree near the rear of the plot exerts its influence twice: through its root protection area, which constrains where you can excavate, and through its canopy, which constrains what you can sensibly build beneath. Ignoring trees and boundary conditions is the classic failure on rear-extension projects around here, so a tree survey and a boundary check come before the layout, not after it. The depth you take into the garden is then judged against what remains: the amenity of the garden you keep is part of the planning assessment, not an afterthought to it.
The rear structural opening is what decides how the finished room actually feels. Taking out the back wall of a back addition, or opening most of the rear wall of an interwar semi, removes masonry that was bracing the house, so the replacement is not simply a beam over a hole — it is a frame that carries the floors and roof above and restrains the wall laterally. Whether the new beam sits as a visible downstand or is lifted flush into the floor zone changes its depth, its weight, the padstones and columns it lands on, and the cost of getting it in. The good ceiling heights typical of the Edwardian and interwar houses here often let you accept a modest downstand where a flush beam would be disproportionate to what it buys. We settle that with the structural engineer at design stage, temporary works included, rather than leaving it to be discovered once the wall is already propped.
Below ground is where rear extensions in this stock most often surprise people. The old kitchen's waste, the rainwater downpipe and the soil stack usually all arrive on the rear elevation, feeding a gully and an inspection chamber that sit precisely where the new floor slab wants to be. Each of those has to be re-routed, and where the drain is shared with a neighbour or forms part of the public sewer, building over or near it needs a build-over agreement with the water utility. Rebuilding the below-ground drainage, repositioning the soil stack and finding an honest route for the kitchen extract and any mechanical ventilation are ordinary pieces of work — but only when they are designed rather than improvised on site. We survey the existing runs and fix the drainage layout before the slab and foundations are designed, because a manhole found mid-build is a programme problem, not a detail.
Extending the back of a house makes the plan deeper, and a deeper plan goes dark in the middle unless daylight is deliberately designed back in. Full-width glazing to the garden lights the new zone superbly and does nothing at all for the old centre of the house, so rooflights over the junction, a glazed link where a back addition is retained, or an internal opening that borrows light are usually what stop a large kitchen from having a gloomy heart. Glazing cuts both ways on comfort too: where a rear elevation catches strong afternoon sun, a wall of glass needs a solar-control specification and a real ventilation strategy, and the building regulations set the insulation and ventilation standards it has to meet. Across the boundary, daylight and sunlight to a neighbour's windows is assessed using the established BRE tests, and a section that steps the roof down near the boundary usually keeps a scheme within them. Right to light is a separate civil matter that planning consent does not resolve.
A kitchen brief in one of Golders Green's purpose-built mansion flats — many of them around the crossroads and Finchley Road — is a different animal, and treating a flat like a suburban house is the classic local mistake. There is no extension to design: the work is internal, governed by your lease, and it needs freeholder consent as well as party wall agreement with the flats around you, while the position of the existing soil stack quietly dictates where a kitchen can actually go. House or flat, our sequence is the same and deliberately front-loaded — measure the property, establish its designation position with Barnet, survey the trees and the rear drainage, then test two or three footprints against what the garden, the neighbours and the structure will genuinely take, before any of them becomes a planning drawing and, later, the building regulations package a contractor prices from. The difficult facts arrive while they are still cheap to design around. We do not promise approval on any route; we put the strongest case the property will carry.
