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Inspect rooms for waterproofing quote. Quote 2 rooms (3 walls?) and potentially floor.

Mould issue on the bottom floor of 3 story townhouse. The bottom floor is build into a hill (masonry blocks facing soil, then plasterboard which has become mouldy. Attached some pics of impacted rooms, and the front/side of the house: 1. The rear walls can’t be accessed from outside. It’s facing into the hill and top floors extend further back. 2. The side wall is partially into hill of driveway. 3. The rear wall plaster appears to be immediately in front of cement bricks, the side walls I assume there’s a wooden frame there but haven’t looked behind the plaster Need someone that has experience with similar situations. I think we need: 1. Remove plaster 2. Apply layers of waterproofing bitumen 3. Apply layer of breathable render and paint, or replace plaster