Seksjonere hus

Hi, we would like to create an appartment for sale out of our house first floor. The fist floor already has a 55sqm appartment, i would like to connect the rest of the first floor to this appartment to create a 100sqm appartment and sale it. We need to build walls, sound proof ceilings, tear down some walls and create a nicer kitchen, we might need to extend the house a little to create an entrance for the appartment and extend the terrace. i only take contact with serious entrepeneurs committed to complete the project in less than 5months.