Question: home plans are what size? answer: in terms of square footage, our most popular house designs typically fall between 1,500 and 2,500 sq. ft. with regard to the paper on which architectural plans are printed on, the most common paper size is referred to as arch d (24 x 36 in.), although smaller and larger paper sizes are also possible.. Homebyme, free online software to design and decorate your home in 3d. create your plan in 3d and find interior design and decorating ideas to furnish your home. Our home plans include free shipping, free design consultation, and a free home building organizer to help plan, build, and organize your project. our house plan exchange policy if you need to exchange your plans, the house designers will exchange your first plan purchase for another house plan of equal value up to 14 days after your purchase..