LogFAQs > #879328786

How are you going to heat and cool? Where will you place the hot water heater? Did you set aside room for a mini fridge? Will your stove have an oven? Will you just use a laundry mat for your clothing?

To save room in some countries the toilet and shower are all together much like an insert tub but I don't know if they are widely available.

Depending on the climate where you are the roof usage is a good idea. Personally I'd want a porch too with roof access from there.