The best option is: 29.000€ full demolition house (the owner has a budget of it and also has been talking to the City Hall already and is waiting for a final answer but it’s “pre approved”) So starting the construction from the beginning, the project could be something like this: -200 square meters basement (with natural light because it’s gonna be like 1,5 meters above ground level (there is more than enough to make a Cinema room, gym, etc) -250 square meters on main level + 250 on first level (it will have better sea view than today because it will have more height than it does now) – Rooftoop with exterior kitchen and a plunge pool or something like that.