The existing room, till now a simple bathroom, has an unconventional shape: no parallel walls and a cramped space. Our client’s wish was to isolate the boiler from the bathroom and to build in the latter a shower, a toilet, a sink and a washing machine. The idea has been to elevate the floor of the bathroom up to the windowsill which then became integral part of the floor so that it can be used as part of the walking area. The elevation of the floor allowed to integrate the washing machine under the sink and free up space. The bathroom finally remained spacious and luminous in spite of the 4,5m².