How do you define “Tiny House”?

A tiny house is a residential structure that is typically sized under 600 square feet. There are 2 accepted designations:

1) THOW (Tiny House On Wheels) which can fit on a trailer have max dimensions of 8 feet 6 inches wide, 13 feet 6 inches tall, and 40 feet long providing a total maximum of about 340 square feet. With proper vehicle, you could tow this size tiny house yourself.

2) Park Model RV (PMRV) which is 396-399 square feet and feels a bit like a bright 1 bedroom apartment. These can be up to 14 feet wide but require permitting and tractor-trailor truck for moving.