Definitions of Tiny Homes/House

There are several definitions of a tiny home/house. Below are some of it.

Tiny House and "tiny house with wheels" means a dwelling to be used as permanent housing with permanent provisions for living, sleeping, eating, cooking, and sanitation built in accordance with the state building code and constructed in accordance with WAC 51-51-60104 and does not have an interior habitable area greater than 400 square feet.

Tiny House means a structure designed and constructed to specifications approved by OMI, and built principally by volunteer and work equity labor, for occupancy as part of OMI’s Tiny House Project. It may also mean another structure identified by OMI as a Tiny House. Each Tiny House will have a unique Tiny House Identification Number. In this contract, where the term Tiny House refers to an individual structure, it means specifically Tiny House . “Work Equity Credits,” or “Credits,” in this contract means credit toward purchase of the Tiny House, measured in hours of work. Work Equity Credit may be earned by work on Tiny Houses, whether intended for the Occupant or not, or by other work certified by OMI as qualifying for Work Equity Credit toward a Tiny House.

https://www.lawinsider.com/dictionary/tiny-house

The tiny-house movement (also known as the small house movement) is an architectural and social movement that advocates for downsizing living spaces, simplifying, and essentially "living with less."[1] According to the 2018 International Residential Code, Appendix Q Tiny Houses,[2] a tiny house is a "dwelling unit with a maximum of 37 square metres (400 sq ft) of floor area, excluding lofts." While tiny housing primarily represents a return to simpler living, the movement was also regarded as a potential eco-friendly solution to the existing housing industry, as well as a feasible transitional option for individuals experiencing a lack of shelter.[1]

This distinction is important as many people look to place tiny houses on empty lots, however if a tiny house lacks any one of the necessary amenities required for a dwelling unit then it is an accessory structure and must be placed on the same lot as a primary structure per the 2018 International Residential Code. There are a variety of reasons for living in a tiny house. Many people who enter this lifestyle rethink what they value in life and decide to put more effort into strengthening their communities, healing the environment, spending time with their families, or saving money.[3]

https://en.wikipedia.org/wiki/Tiny-house_movement