House on piers Susan is one of our tiny home designs. It is 1 room small house, a single 222 sq. ft. (20,64 m2) elevated timber house on pillars plus with a flat roof. It’s 20′ x 11′-1″ (6,10 x 3,38 m) inside includes bathroom plus kitchenette also has 43 sq. ft. (4 m2) porch at the front and on the back.