Alterations to existing outbuilding involving replacement of roof from flat roof to pitched roof; replacement of side fence

Application for a Non-Material Amendment in (S96a) seeking to allow timber gas meter and ventilation housing in relation to planning permission reference 212310FUL dated 28/05/2021 for 'Conversion of existing building comprising two self-contained flats into single family dwellinghouse; single storey rear extension (following demolition of existing single storey extension); replacement of all windows with timber framed double glazed sash and casement windows; installation of two rooflights to main side roof slope; single storey front porch extension (canopy style); decorative masonry gable at roof level to front elevation; installation of PV solar panels to existing second storey rear flat roof; rear roof extension (following demolition of existing roof extension); removal of existing chimney stack; enlargement of existing basement level; and replacement boundary fencing and gate to front north boundary '