OK that's super crazy cash!
I'm in Edinburgh (which is not very cheap at all!) and we did our big project about 4 years ago:
-fully converted a garage to become a living room in a period property, including full timber sash windows, new front, shitloads of insulation (council are very picky!), floor leveling and relocating all of the pipes from the walls to under the floor, plus full electrics
-turning an old utility room in to a kitchen, including raising the floor, oak flooring, fresh plasterboard and plastering, boiler being taken off the wall, moved up, new core drilled, reinstalled
-brand new kitchen
-upstairs room ripped out (was a livingroom and kitchen), pipes moved, new wall built, cornicing replaced, stone fireplace removed, electrics, partial replastering...
-bathroom wall taken down, whole bathroom ripped out, new bathroom installed (including totally relocating the bath from one end of the room to the other, expensive tiling, jacuzzi bath)
-downstairs cloakroom refitted
plus various other odds and ends
Total cost was about £37k by the end of it. £14k for a cloakroom and moving the boiler seems insane by comparison even allowing for inflation.