Trending 20X20 400 Sq Ft House Plans Designs - Our traditional plans come in all sizes, range from one to three stories, and impart the charm of craftsman, colonial, country, victorian, and many more types of. Browse architectural designs vast collection of 1,200 square feet house plans. 20X20 400 Sq Ft House Plans Designs / Tiny house plans 5×6 build from steel frame siding panel 16×20 feet.