10 would be one thing. Making it technically illegal for 4 to live in a house built for at least that many (3br, 3ba home) is something completely different. We had 4 people in ours (technically against ordinance) because we used the office downstairs as a bedroom. We had a TON of space in that house (over 2k sq ft finished, plus a large unfinished area in the basement) so its not like we were packing in a bunch there.or having 10 people live in a house built for 4? Brilliant.
Many times it isn't the house that's an issue, but rather stuff like parking. We had a couple houses with students in our neighborhood. Most were great, but one decided to use their garage as a den/storage so they had five cars parked out front. Also threw parties where their guests would leave beer cans in peoples yards as they walked by. Needless to say that the housing department had more than one inspection there.