Building an ADU in your backyard requires careful planning to meet both the unit’s size and your city’s setback requirements. Most cities require at least four feet between the ADU and side or rear property lines. In addition, the total structures on your lot, including your house, ADU, garage, and other buildings, cannot exceed a certain percentage of the lot, which varies by city. Parking requirements also depend on location. Properties near public transit often do not need extra spaces, while other lots may require at least one parking spot.
