Walnut Creek, CA Solar Energy: Panel Permits (2026)

California AB 2188 (2014) and subsequent SB 379 require cities to adopt expedited, streamlined permitting processes for small residential rooftop solar energy systems (up to 10 kW AC). Walnut Creek complies with these mandates through its Community Development Department Building Division. Solar PV permit applications for systems meeting the California Solar Permitting Guidebook eligibility checklist (single-family, under 10 kW, no structural concerns) qualify for same-day or 3-business-day review. Applications can typically be submitted online through the City's ePermit portal. Required submittals include a site plan, one-line electrical diagram, structural calculations if applicable (or compliance with the prescriptive structural pathway), manufacturer specification sheets for modules, inverters, and racking, and a completed solar checklist. Permit fees are capped by state law at actual cost of processing, not to exceed $500 for residential PV. Battery storage systems (Tesla Powerwall, Enphase, etc.) up to specified capacity qualify for expedited review as of SB 379. PG&E interconnection is separate from city permitting. Roof fire access pathways per CA Fire Code 605.11 must be maintained.