The DIY house best fits a typology of flexible, urban, residential infill. Located on a lot zoned for two dwelling units, the initial concept for the project was to build a wood framed studio for two people to live comfortably, and when finances allowed, build out the lot density with two single family homes. Designed to be built exclusively by the owner, who had no construction experience and a budget of $150,000, this single-story wood-framed residential studio in Berkeley, California, combines sustainable building practices with an elegant, expandable design. All components – electrical, framing, plumbing, holdowns, and foundation – were designed and installed to support a second floor addition. To that end, a hole with temporary joists spans the future stair cavity. The reusable metal shed roof uses ceiling joists that can, at a future time, support the weight of a second story. Natural materials, passive solar heating, high energy efficiency, natural lighting, and cabinetry level construction define the space of this urban residence.