Hello, We are looking for a prefab house.I thought about buying building land, and building a prefab building,consider a building of 200 square meters,I haven't decided yet, for now consider only houses (on 3/4 floors).can i build only 1 floor, and then in the future other floors above? for example I immediately build 1 floor and then after 1 year another floor, and then other floors after a few months (it's an example) 1) 200 m2 per floor 2) initially consider only 1 plan (then possibly other plans in the future) 3) on each floor 4 apartments of 50 square meters can you give me 2 estimates? a) 1 estimate every 135 sq.m. b) 1 estimate every 67,5 sq m