Why the borough boundary changes your West London loft
West London is not one planning market. It is 7 councils applying national permitted-development rules to Victorian and Edwardian terraces, interwar Metroland semi-detached houses, interwar Metro-land semi-detached houses, Victorian and Edwardian terraces across Chiswick and stucco-fronted Georgian and Victorian terraces — and reading them against local guidance that differs street by street. The same rear dormer, drawn identically, can be lawful in Hammersmith and Fulham and need a full application a mile away in Harrow. That is the 4-point spread in the table below in one sentence.
The roof stock explains much of it. Lofts across the region sit under London butterfly / valley roofs on the terraces, hipped roofs on the 1930s semis, London butterfly roofs concealed behind the terrace parapets, back-addition closet-wing roofs that shape side-return schemes, steeper gabled roofs in Pinner village, gabled roofs on the older village cottages, London butterfly and valley roofs on the Chiswick terraces, hipped roofs on the interwar semis, concealed butterfly roofs behind the terrace parapets, mansard roofs added to the stucco terraces, mansard roofs to the stucco terraces and concealed butterfly roofs behind parapets, and each supports a different conversion: a rear dormer where the roof runs front-to-back with a usable rear slope, a hip-to-gable where the roof is hipped and the side is dead space, a mansard where the street already carries them. We survey the roof before we recommend a route, because the geometry — not the brochure — decides what the space becomes.
Protection is the other half. West London holds conservation areas including Bedford Park, Ealing Common and Ealing Green, where Class B loft rights are removed outright, and 7 of its 7 boroughs layer Article 4 directions on top. Those are street-level designations, not borough-level ones — which is why we check your exact address against them before a line is drawn, and why a regional average is a starting point rather than an answer.
