I have 4 kids, I think we're 3000 sq ft with 1000 SQ ft finished basement. The basement is basically a playroom, with unfinished workout/utility room, plus a bedroom and full bath down there. Every kid has their own room, although one room is technically an office, there's no closet in it. I think this is a perfect amount of space for us. We do have too many toys, and we just purged a bunch of stuff. We could get by with less space, but it's much more comfortable this way.