For most Holland Park houses, a rear extension is the natural route to a larger kitchen and dining space, and two things govern how far it can go: the depth of the garden and the rear building line set by the neighbours on either side. A generous villa plot can invite an ambitious projection, but the council reads any pronounced step beyond that datum as harm to the garden setting. We record the existing back elevation, work out how deep the addition can run before it overwhelms the garden, and identify the point where daylight into the existing rooms begins to fall away.
Whether the extension rises one storey or two reshapes the whole assessment. A single-storey addition presents as subordinate infill at garden level, so it is weighed largely on depth, the shape of its roof and how it sits with the immediate neighbours. Taking the extension up to full height is a bigger move, drawing in the first-floor windows next door, the shared party wall and the balance of the original back elevation. On the tighter terraces behind the main streets, a two-storey rear addition frequently has to be drawn in or stepped down so the light and outlook next door remain acceptable.
Your neighbours are protected by two different tests, and each leaves its mark on the drawings. The planning judgement turns on daylight and outlook — whether the projection would feel overbearing from the nearest window next door. Right to light sits apart from planning as a property right, which means a consent from the council can still leave you exposed to a neighbour's claim, a genuine concern given the value of Holland Park houses. And since almost every house here abuts a flank or boundary wall, the Party Wall etc. Act 1996 is nearly always in play, with notices best served long before work starts.
Whether an addition looks like part of the house or an afterthought comes down to materials. On a stuccoed villa, a rendered extension that continues the parapet, string courses and cornice line will usually settle in far better than raw brickwork; on a brick house we match the brick itself, along with the bond and the mortar. Filling the slim gap beside an original closet wing — the side-return infill — remains one of the most productive moves on a Holland Park terrace, broadening the ground floor without eating into the garden. A rooflight or a low glazed roof carries daylight into the depth of the plan while keeping the new work discreet.
The character of Holland Park limits what will realistically be allowed. A large part of the area lies within a conservation area, and its grand villas, planted squares and studio-houses are judged against demanding design standards; listing is frequent enough here that it has to be checked rather than taken for granted. Conservation-area status strips away some permitted development rights — side extensions especially tend to need a householder application — while a listed house brings any rear or side extension within listed building consent. Before we settle a scope, we confirm the designation, boundary and listing for the precise address against the RBKC appraisal and the national list.
Because the consent route differs from one Holland Park house to the next, our first task is to pin down which apply: any surviving permitted development, a householder application that RBKC aims to determine in roughly eight weeks, listed building consent, and freeholder or estate approval where the house is held on a long lease. From there we carry out the measured survey, shape the extension around the constraints above and produce the drawings each route demands. Throughout, we give an honest read on the likely outcome and never treat a planning permission as guaranteed.
