Internal and external alterations to 36 Hertford Street including demolition and remodelling of existing mansard roof, with new roof level plant enclosure. (Linked with 22/05759/FULL)

Alterations including remodelling and reconstructing internal walls, replacement of external sliding doors, refitting existing window frames with slimline double glazing, and mounting an air source heat pump at roof level and a hot water cylinder on the terrace.

Internal and external alterations, including removal of modern fixtures and fittings and reinstatement of lost historic fabric, reconfiguration and replacement of modern circulation elements, some minor alterations to modernised plan form and replacement services. Remodelling of fourth floor mansard, replacement of modern skylights at ground. Removal of access ladder on the front of the mansard and railings on the party wall with 37. Continuation of internal staircase to provide maintenance access to the roof vis a new sliding access hatch skylight. Replacement timber doors to the house at ground and at basement level and to the vaults; reinstatement of Portland stone to the entrance steps, external entrance and vault doors to ground and lower ground. (Linked to 21/06872/FULL)

Excavation of a new basement level, erection of a mansard roof extension, and two storey infill extension (rear ground and lower ground floor level) and remodelling of the ground and first floor extensions to the existing closet wing and single storey extension at rear third floor level. Associated external and internal alterations including installation of a lift.