Square footage planner

How the planner sizes things

It lays zones end to end along an 8.5-foot-wide trailer (the federal width limit) and rounds up to the next common trailer length. Zone lengths are planning allowances we use to sketch a layout, not code minimums: a 24-inch range and 24-inch fridge plus counter for a full kitchen, a 60-by-80-inch queen with walk space for a ground-floor bedroom, about three feet for an entry. Your designer will move things around; this gets you in the right size range before you pay anyone.

A sleeping loft takes no floor length because it sits over the kitchen and bath. That's the main reason most tiny houses on wheels use one. The trade-off is a ladder or stairs every night. The tiny house appendix used in Florida's building code sets loft minimums of 35 square feet and 5 feet in each direction.

Over 400 square feet you're past the tiny house appendix and the park model RV cap. Read wheels vs foundation and furniture that fits.

Building on a foundation instead, as a backyard ADU? You aren't held to the 8.5-foot road width, but local size caps apply; see Tampa Bay ADU rules and are tiny homes legal in Florida. Then turn the size into a budget with the tiny house cost calculator.

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