The property is a two level flat in a loft conversion, 1,100 sqft, 3 bed. The house is a Victorian conversion typical for South Hampstead. The calculations are required for the following: 1) an internal portion wall to be demolished and replaced with two parallel walls, two bathrooms to be placed in-between (not clear if the flat below has a supporting wall), 2) section of a top floor to be lowered by 30cm 3) an existing dormer to be rebuild to be able to support a roof terrace on top.