Replacement single storey rear extension, removal of front porch, removal of existing garden wall and erection of new garden walls, replacement of front vehicle and pedestrian gates, new paving and soft landscaping to front, side and rear, and minor alterations to house. Refurbishment of existing outbuilding and erection of lean-to greenhouse. Repair and conversion of Dovecote.

Remodel the existing western extension to reduce the parapet height on the eastern elevation and introduction of a pitched slope with roof tiles to match the existing; remodelling of the openings to create a glazed western elevation with french doors on the north end; infilling of the existing cut-out to the doorway to create an improved roof profile, with the introduction of a matching parapet wall to create a visual break between old and new. New single storey rear extension reflecting the location and footprint of the former extension to the cross-wing with access using a former doorway to be unblocked. External landscaping works.

Demolition of existing late C19th closet wing (c.1890) to the south facade and construction of a new, traditionally designed and detailed closet wing to provide wheelchair and ambient disabled access to the Master's Lodge, with an accessible lobby, storage for coats and an accessible Part M compliant wc and the landscaping of the existing Hostel Yard to provide level access to the new closet extension with provision for a refuse store behind the Peterhouse Hostel.

Demolition of existing rear extensions and replacement with single storey link element and one and a half storey extension with associated hard and soft landscaping, alterations to main house including removal of roof lights to front elevation and changes to windows, replacement of garden gates and garden shed