25A Collingbourne Road, London, W12 0JG

Demolition of the single storey back addition and rear outbuildings attached to the rear of the main building; erection of side and rear extensions at lower ground, upper ground and first floor level, erection of a rear roof extension to replace the existing dormer window, excavation beneath the main building in connection with the creation of a new basement and the formation of a roof terrace at upper ground floor level to the main building; change of use of the main building from office (Class E) into 2 x two bedroom self-contained flats; erection of a part one storey plus-basement single family dwellinghouse in the rear garden; erection of a new boundary wall with three new entrances to the side elevation; associated landscaping and external alterations.

Submission of details of the following external facing materials (including manufacturer's specifications, photographs and/ or a physical sample) comprising of: External walls; Porcelain tiles pursuant to condition 4 of planning permission ref: P/2026/02040/FUL granted 2nd October 2026.

Erection of a rear roof extension involving an increase in the ridge height by 200mm; erection of a rear extension at second floor level, on top of the existing back addition; installation of 3no rooflights in the front roofslope; alterations to the roof of ground floor rear back addition to include the installation of 2no rooflights; alterations to the rear fenestration to include the installation of new doors and windows to replace the existing; conversion of the building into 1 x 1 bedroom, 1 x 2 bedroom and 1 x 3 bedroom self-contained flats.