Average Square Footage of a House: Avoid Buying Too Big of a … Apr 01, 2019 · 4. The Bathroom. Yes folks do shower in the AM versus the PM to help with hot water issues. A bath JUST for guests should be a luxury. How big? Do the makeup and hair in the bedroom at a mirror. Do you need a tub and a shower? No. In my married life we have lived in spaces as small as about 700 sq feet to about 4000.