How to figure this out?
Styrofoam sheets can be found at most retail stores for as low as $5 or $6. They come in different sizes and thickness, so thin foams would work as they are easy to cut and glue. With a ruler on hand, each inch could be the equivalent of 1 foot. Get all your items spaced out where you would really place them in a real tiny house and then figure out how many feet long and wide do you need your home to be. Example: 8 ft. wide x 30 ft. long x 13.5 ft. high.
As you think about floor plans and where you would place your kitchen cabinets, appliances, pantry, closets, furniture, etc., keep in mind your wants as your needs for your small house living. Would or could you live inside a Tiny House 24/7? So now you have a better idea… got to have your wants as well as your needs. This is going to be a fun project to work on!
Have you gone around looking for the pre-fab buildings? Just recently walked into one at Home Depot that was 10 x 20 with a second floor (barn shape) and envisioned living in it, but wished it was 10 ft. longer. The price was approximately $16,000 for just the shell. It had upgrades such as, roof, siding, 2 windows, 1 door and stairway inside. So should we consider to double the price for making it livable nice space as a ball park figure?