Side return extension in Hammersmith and Fulham

Usually yes — treat a full householder application as the default. Side extensions are excluded from permitted development in conservation areas, which cover much of the borough's terraced stock, and even outside one most genuine side returns exceed the single-storey, under-4m-high, half-width limits once a rear element is added. Budget for design scrutiny on the boundary wall and the roof junction with the host house.

A staple on the Fulham and Brackenbury terraces; outside the conservation areas PD rights often apply.

Side returns are a staple on the Fulham and Brackenbury terraces: narrow flank, dark middle room, obvious infill, and a deep enough local precedent base that a well-judged scheme can lean on nearby consents. Outside the conservation areas, permitted development rights sometimes still apply to a pure side infill that stays within the size limits — but wrap-arounds almost never do. Officers weigh boundary wall height, daylight to the neighbour's rear windows and how the new roofline meets the original house.

Under permitted development, side extensions (GPDO Class A) must be single storey, no more than 4m high and no wider than half the original house — but side extensions are excluded from PD entirely in conservation areas. Wrap-around schemes combining side and rear elements usually exceed PD limits and need full permission everywhere.

In practice, most London side returns proceed by full householder application. The good news is the precedent base: on streets of identical terraces, a consented side return three doors down is the strongest evidence your scheme can cite. Officers focus on the boundary wall height, neighbour daylight and the junction with the host roof.