Top 10 Most ADU-Friendly Cities in America (2026 Ranked by Data)

Not all cities are created equal when it comes to ADU development. We scored 50 cities across 14 states on zoning flexibility, permit costs, approval timelines, construction costs, and rental income potential. Here are the 2026 winners.

#1: Los Angeles, CA (Score: 9/10)

Los Angeles is one of the most ADU-friendly cities in the US, with streamlined permitting and strong state protections. The city has seen a massive surge in ADU construction since 2017, issuing over 2... ADU construction costs average $150,000-$350,000, with rental income potential of $1,800-$2,500/mo for a 1-bedroom unit. Permits take 60-day ministerial review (state-mandated) and cost $4,000-$15,000 depending on size and type (plus 10% General Plan Maintenance Surcharge on permit fees as of June 9, 2026).

#2: San Francisco, CA (Score: 9/10)

San Francisco has embraced ADUs as a key housing solution, with one of the most progressive ADU programs in the state. The city offers expedited review, fee waivers, and pre-approved plans to encourag... ADU construction costs average $200,000-$450,000, with rental income potential of $2,200-$3,200/mo for a 1-bedroom unit. Permits take 60-day review period (state-mandated) and cost $5,000-$20,000 depending on scope.

#3: San Diego, CA (Score: 9/10)

San Diego is a national leader in ADU construction, with more ADU permits issued per capita than almost any other US city. Its ADU Bonus Program lets owners build extra market-rate ADUs in exchange fo... ADU construction costs average $120,000-$300,000, with rental income potential of $1,600-$2,200/mo for a 1-bedroom unit. Permits take 60 days (often faster) and cost $3,500-$12,000.

#4: Portland, OR (Score: 9/10)

Portland is one of America's most ADU-friendly cities, with streamlined approval processes and generous size allowances. The city allows both detached and attached ADUs with minimal setback requiremen... ADU construction costs average $150,000-$300,000, with rental income potential of $1,400-$1,900/mo for a 1-bedroom unit. Permits take 30-45 days and cost ~$1,900 permit and plan review; plus System Development Charges (SDCs) of about $19,000 - see impact fees.

#5: Seattle, WA (Score: 9/10)

Seattle is one of America's most progressive ADU markets, with by-right (building-permit) approval for both detached (DADU) and attached (AADU) ADUs and no owner-occupancy requirement. Up to two ADUs ... ADU construction costs average $160,000-$320,000, with rental income potential of $1,600-$2,100/mo for a 1-bedroom unit. Permits take Several weeks to a few months depending on review queue and cost $2,000-$5,000+ in SDCI permit fees (varies with valuation; hourly review rates apply).

#6: Minneapolis, MN (Score: 9/10)

Minneapolis is one of the nation's most ADU-friendly cities, allowing up to three dwelling units per lot in many zones. The city's progressive housing policy makes it an excellent market for ADU devel... ADU construction costs average $140,000-$280,000, with rental income potential of $1,350-$1,800/mo for a 1-bedroom unit. Permits take 40-60 days and cost $1,800-$3,000.

#7: Berkeley, CA (Score: 9/10)

Berkeley is one of California's most ADU-friendly cities: detached ADUs up to 1,200 sq ft and 25 ft tall, no parking requirement, no owner-occupancy rule, and an ADU amnesty program for unpermitted un... ADU construction costs average $250,000-$500,000, with rental income potential of $2,300-$2,900/mo for a 1-bedroom unit. Permits take 60-day ministerial review; deemed approved if the city fails to act within 60 days (SB 543, eff. Jan 1, 2026) and cost $250 zoning plan check + $500 neighbor noticing fee at submittal + $250 address assignment; building permit fees based on project valuation (city fee estimator tool available).

#8: San Jose, CA (Score: 8/10)

San Jose has seen rapid ADU growth driven by Silicon Valley housing demand. The city follows CA state law closely and has added local incentives to encourage ADU construction.... ADU construction costs average $180,000-$400,000, with rental income potential of $2,000-$2,800/mo for a 1-bedroom unit. Permits take 60 days and cost $4,000-$14,000.

#9: Sacramento, CA (Score: 8/10)

Sacramento offers an excellent balance of affordability and ADU-friendliness. As California's capital, the city has been proactive in adopting state ADU reforms and offers some of the best ROI in the ... ADU construction costs average $100,000-$250,000, with rental income potential of $1,300-$1,800/mo for a 1-bedroom unit. Permits take 60 days and cost $3,000-$10,000.

#10: Oakland, CA (Score: 8/10)

Oakland has embraced ADUs as affordable housing solution with some of the Bay Area's most supportive local policies. Lower land costs than SF make Oakland ADUs particularly attractive for investors.... ADU construction costs average $160,000-$380,000, with rental income potential of $1,800-$2,600/mo for a 1-bedroom unit. Permits take 60 days and cost $4,000-$15,000.