Construction of a new single-storey rear extension with a pitched roof and roof light at ground floor level; Creation of a storage and plant room at the lower ground floor level beneath the proposed rear extension; Construction of a first-floor extension with a pitched roof to the side; Energy efficiency upgrades, including window replacement, heating system modifications, and the installation of external insulation; Alterations to elevations and internal layout, as well as all ancillary landscape & site development works