What is the difference between an ADU and a Tiny Home? Are there additional regulations to Tiny Homes?

Tiny Homes (THs) are smaller units up to 400 square feet including at least 120 square feet of first floor interior living space. Movable tiny homes (MTHs) have the same size requirements but are built on a chassis and meet park model RV standards. If a TH or MTH is installed on a permanent foundation, it is permitted and regulated like an ADU. Both must include functional areas for cooking, sleeping and sanitation. Additional design guidelines apply to THs and MTHs. No matter the design, ADUs cannot be on wheels.