A zoning overlay protecting neighbourhoods of historic significance. ADUs in HPOZs require a Certificate of Appropriateness for design review.
Common in older LA neighbourhoods (Angelino Heights, Spaulding Square), Pasadena, and Berkeley. HPOZ design review adds 2-4 months to the permit timeline and constrains exterior materials, rooflines, and façade treatments.
Part of the BackyardADU California ADU Glossary — plain-English definitions of the regulatory, construction, and financing terms you'll encounter during a California ADU project.