加州附属住宅许可七年涨近四倍：2018年约9,000套、2025年约42,000套
加利福尼亚州各市县向州住房与社区发展厅（HCD）提交的年度进展报告数据显示，加州附属住宅单元（ADU，后院住宅）许可量自2018年以来逐年上升：2018年全州约发出9,000套ADU许可，2025年已升至约42,000套，七年增长近四倍。
ADU是在既有住宅用地上加建的小型独立住宅，包括后院小屋与车库改建等形式，被州与地方政府视为不新占土地、见缝插针增加住房供给的办法之一。许可量连年上升，显示这类住房已从个别业主的尝试变成加州住房供给中稳定的组成部分。
不过业主反映，融资仍是把许可变成完工住宅的主要门槛之一，施工贷款与建成后估值等问题影响ADU落地速度。（来源：加利福尼亚州住房与社区发展厅）
California ADU Permits Up Nearly Fourfold in Seven Years: About 9,000 in 2018 and Roughly 42,000 in 2025
Annual progress report data that California cities and counties file with the state Department of Housing and Community Development (HCD) show that permits for accessory dwelling units (ADUs) have risen every year since 2018: about 9,000 ADUs were permitted statewide in 2018, and roughly 42,000 in 2025, a nearly fourfold increase in seven years.
An ADU is a small, independent dwelling added on an existing residential lot, including backyard cottages and garage conversions, and state and local governments have promoted them as a way to add housing supply without developing new land. The steady rise in permits shows this housing type has grown from individual homeowners' experiments into a stable part of California's housing supply.
Owners report, however, that financing remains one of the main hurdles between a permit and a finished home, with construction loans and post-completion valuation affecting how quickly permitted ADUs get built. (Source: California Department of Housing and Community Development)
来源：加利福尼亚州住房与社区发展厅
发布：GSM·美国（发布链接）
图片来源：图片来源：Wikimedia Commons「EXTERIOR VIEW OF FRONT OF CLUB HOUSE. BOAT HOUSE AND DOCK TO THE RIGHT. PICTURE TAKEN FROM FRONT YARD OF COTTAGE 231, CAMERA FACING SOUTHWEST. SMALL WOOD FRAME SHED IN FRONT OF HABS ID,1-KU.V,1-I-1.tif」（Related names: Maul, David, transmitter 摄，Public domain），图中为后院附属住宅示意 Image: Wikimedia Commons "EXTERIOR VIEW OF FRONT OF CLUB HOUSE. BOAT HOUSE AND DOCK TO THE RIGHT. PICTURE TAKEN FROM FRONT YARD OF COTTAGE 231, CAMERA FACING SOUTHWEST. SMALL WOOD FRAME SHED IN FRONT OF HABS ID,1-KU.V,1-I-1.tif" (by Related names: Maul, David, transmitter, Public domain)
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