Tiny House in My Backyard (THIMBY) is an interdisciplinary collaboration of UC Berkeley students building a zero net energy tiny house (less than 400 sq. ft.) for the Sacramento Municipal Utility District (SMUD) Tiny House Competition. THIMBY will demonstrate a path forward in tackling several of the challenges to affordable, sustainable housing. We will build a zero-net-energy, zero-net-waste tiny house and use it as a model to advocate the widespread adoption of efficient living. The house will generate its own electricity, harvest its own water, and be small enough to fit in the unused portions of urban lots.