Two-storey extension including roof-level plant along the Bressenden Place façade to provide a new office entrance pavilion (Class E), the provision of Class E office / retail accommodation, remodelling of the crown of Portland House and creation of a setback rooftop extension to provide office amenity (Class E) and an outdoor terrace, reconfiguration of the second floor plant accommodation fronting Cardinal Place, relocation of the zephyr on Bressenden Place, provision of cycle parking, public realm and associated works including window replacement and the application of a new façade treatment.

Excavation to create a basement beneath the house and front and rear gardens with associated lightwells and alterations to fenestration at lower ground floor level, bin store with sedum roof, planters and soft landscaping to front and rear gardens including replacement tree planting (Part Retrospective).