ADDENDUM TO ACCESSORY DWELLING UNIT HANDBOOK — 2025 California ADU Handbook (HCD)

January 2026 ¶

Introduction Over the years, State Accessory Dwelling Unit (ADU) Law has been revised to improve its effectiveness in creating more housing units. Changes to State ADU Law further reduced barriers to the development of ADUs and junior accessory dwelling units (JADUs). Within this context, the Department of Housing and Community Development (HCD) developed – and continues to update – the ADU Handbook to assist local governments, homeowners, attorneys, architects, builders, and the public in understanding and applying the requirements of state law. This document serves as an addendum to the…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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