ADU Laws & Permits

Arizona ADU law (HB 2720) requires larger cities to allow an attached and a detached ADU. See sizes, setbacks, parking, rentals and fees.

Owner-occupancy rules for ADUs: which states bar them? Compare California, Washington, Oregon, Colorado, Arizona and more.

Can an HOA block an ADU? California voids most bans, but a 2026 ruling went the other way for a condo. See how states treat HOA limits.

ADU setback requirements compared: California’s 4-foot rule, Washington, Colorado and Portland, plus fire separation limits.

Do ADUs need separate utility meters in California? What state law, your city and your utility each require, plus cost options.

ADU impact fees: California exempts ADUs of 750 sq ft or less. See the thresholds, school fees, proportional charges and Washington’s cap.

Can you sell an ADU separately? California AB 1033 lets cities allow it as a condo, but only by ordinance. See the conditions and process.

Unpermitted ADU in California: built before 2020 without a permit? AB 2533 lets you legalize it. See who qualifies and how it works.

Colorado ADU law (HB24-1152) requires metro-area cities to allow ADUs. See size, setbacks, parking, owner occupancy, fees and deadlines.

Sacramento ADU rules on size, setbacks, height and impact fees, with the city’s local limits next to the state minimums. Updated Oct 2026.