ANN ARBOR, Mich. (AP) — A 21-year-old University of Michigan student has moved into a 170-square-foot home he built himself.

The Ann Arbor News reports that computer science junior Christopher Cerk brought the tiny house with him for the start of fall classes.

Cerk of Traverse City says he didn’t enjoy dorm life and “started researching different ways to live.”

He spent $13,000 on materials and built the house over the past two years. He has a property owner’s permission to keep it on a lot. It’s on a trailer and Cerk gets water from the property owner’s home.

Cerk is not revealing the location because city ordinance requires homes to be 450 square feet or more.

Efforts to build smaller houses is gaining interest elsewhere, but are pitted against local size rules.