Erection of a rear extension at first floor level on top of the proposed ground floor rear extension, and the formation of a roof terrace above to the rear elevation at second floor level; erection of a single storey rear extension, to the side and rear of existing ground floor back addition; erection of a single storey rear extension at lower ground floor level, following the demolition of existing conservatory; alterations to the rear elevation at second floor level to include, removal of existing dormer windows, erection of a new dormer window, and a new dormer single door to provide access to the proposed roof terrace; landscaping of the rear garden.

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.

Erection of a rear extension at second floor level over part of the existing back addition, following demolition of the chimney; erection of a single storey side infill extension, following the demolition of side bay window and rear timber garden access door; demolition of external store to the rear of existing back addition at ground and first floor level; installation of a rooflight on top of the main flat roof at roof level; installation of a rooflight to the side roofslope of main front roof; erection of a dormer door to the rear of existing rear roof extension, comprising of sliding doors and a Juliette balcony; replacement of all existing single glazed timber framed windows with new double glazed timber framed windows; bricking up 1no. window to the side elevation at first floor level; erection of a replacement brick built bin store with timber doors to the front garden; alterations to the rear elevation at ground floor level to including installation of double glazed aluminium framed sliding doors following the removal of existing doors; erection of a glass balustrade around the perimeter of proposed rear lightwell landscaping of the front and rear gardens; excavation of part of the front and rear gardens to form lightwells, in connection with the enlargement and lowering of existing basement; alterations to the existing front lightwell to include installation of new enlarged double glazed timber framed double doors with window panels; installation of an air conditioning unit within an acoustic enclosure to the front lightwell at basement floor level.

Non-material amendment to planning permission ref: 2017/00362/FUL granted 4th October 2019 for the 'Demolition of existing single storey building fronting Chiswick Mall used for live/work purposes as artists' accommodation and studios and replacement with a new part one/part two storey building with the same use; replacement roof, erection of side dormer and alterations to windows and doors of the existing building fronting the River Thames for continued use for live/work purposes as artists' accommodation and studios; demolition of coal store in courtyard and landscaping of this area; widening and replacement of gates to street frontage; removal of vehicular crossover.' Amendments to include reduction in area of rooflights and alterations to window and door positions on side and river elevation.