Demolition of existing pitched roof and construction of a mansard roof extension across both properties (29-31 Choumert Grove) with four dormer windows to the front elevation and two to the rear elevation to provide additional living accommodation, together with raising the existing parapet wall to the rear elevation and replacing all of the existing windows with aluminium framed casement windows.

Construction of an L-shaped dormer extension at second-floor level over the existing rear roof planes, to provide additional residential accommodation. The works include raising the roof ridge by 330mm. Installation of Velux Cabrio Balcony window and rooflight to front roof slope.

Construction of rear dormer extension with a Juliet balcony to provide additional living accommodation, together with the installation of three rooflights on the front roof slope, the installation of an air source heat pump to the side of the property and alterations to the existing windows and doors to the rear and side of the property.

Conversion of an existing garage to habitable accommodation and the replacement of single glazed softwood doors and windows with double glazed UPVC; and the construction of a rear dormer extension.

Construction of outrigger dormer loft extension with the installation of 1no roof window in front roof slope to provide additional living accommodation.

Non-material amendment to planning permission 20/AP/1585 (Demolition and rebuilding of existing single-storey residential annex with additional first floor extension, erection of 2-storey side extension with accommodation at roof level served by front and rear dormer windows in place of existing garage, and provision of new screening on roof terrace facing school.) Changes proposed is to regularise approved boundary wall alignment by 200mm (B7 on plan) projection towards the school and boundary wall set back from tree (B1 on plan) by 150mm.

Raise ridgeline by 250mm; L-shaped dormer loft extension with 2no roof windows in front roof slope to provide additional living accommodation. Construction of a timber slatted roof terrace to the rear of the dormer.

Construction of a first floor roof extension to the rear outrigger and dormer window to the rear roof plane, and two roof lights to the principal roof plane to facilitate the introduction of additional living accommodation to the existing first floor flat, provision of double doors to the ground floor rear bedroom and Juliet balcony to the first floor rear bedroom.

Demolition and rebuilding of existing single-storey residential annex with additional first floor extension, erection of 2-storey side extension with accommodation at roof level served by front and rear dormer windows in place of existing garage, and provision of new screening on roof terrace facing school.

Details of Condition 7 - detailed drawings, including sections, at a scale of 1:5 and 1:10 of the: mansard extension; parapets and dormer windows required by planning permission dated 06/07/2016 [LBS Ref 16/AP/1767] granted at appeal APP/A5840/W/16/3165639 decision dated 02/06/2017 for 'Extension of the existing mansard roof to create a full storey to match the buildings below and the erection of a new mansard roof above, together with the change of use of part of the ground floor accommodation at no.14 from an office (Use Class B1(a)) to a cafe (Use Class A1/A3) and the change of use of the first, second, third, fourth and fifth floors of no.14 from offices (Use Class B1(a)) to 5 x two bedroom flats and the use of the new roof level accommodation as 2 x one bedroom flats; together with refuse and cycle storage at ground floor level'.