my two daughters have asked to have there own space,, at present i have a old garage which will be demolised rebuilt with a self contained apartment above it, the garage below is needed by me ,, the space i have external is 3.2m wide by 8.6m long it will need a stair case from the garage below ,, which will use space ,, they would like a sleeping area come lounge,, a shower / toilet,,, and a cooking area is this possible given the size? are they expecting to mutch?they will have access the the family house but would like there own space any thoughts ,,,