ADU Electrical Panel Rules in California for 2026
ADU electrical panel requirements in California start with one question: does your existing service have room for another household. That question decides more about your accessory dwelling unit project timeline and budget than floor plan or finish choices, and it is the first thing an electrician checks before anything else gets designed. Why the electrical panel decides what your ADU can become Homeowners tend to think about an ADU as a design problem first: layout, kitchen size, how the unit sits on the lot. The electrical panel gets treated as a line item to solve later. In practice it should
