Backyard Units Gain Traction as Partial Answer to Housing Crunch
Elaine Yang rents a 540-square-foot prefab cottage in her Irvine, California backyard for $3,000 a month, covering her $1,600 loan payment and generating income on top of her primary residence. She bought the accessory dwelling unit from Samara, a company specializing in standalone backyard structures with full kitchens, bathrooms and separate entrances. Yang, an urban planner, views the cottage as a long-term investment that adds flexibility to her property, potentially housing her parents in the future. Roughly one in four new housing structures built in California last year was an ADU, and in cities like Los Angeles and San Francisco, more permits were issued for ADUs than all other housing types combined.
New York recently legalized ADUs under former Mayor Eric Adams and his successor Zohran Mamdani has accelerated the approval process, with officials projecting 25,000 new units over 15 years as part of the City of Yes initiative. The Department of Buildings has received hundreds of permit applications, more than half from Queens where detached houses and larger lots make conversions more practical. A pilot loan program offering up to $395,000 in financing drew over 2,800 applications in 2025, far exceeding available funding, before closing and reopening with capacity for 25 homeowners annually. Construction costs remain a major barrier, with estimates ranging from $200,000 for a garage conversion to $550,000 for a custom build with parking.
Arizona, Washington and other states have passed laws easing ADU restrictions, and Congress approved grants to help local governments adopt preapproved designs as part of a broader homebuilding push. Data from Austin, Nashville, Charlotte and Denver shows affordability improved after ADU reforms, though the units represent a fraction of overall housing need. In New York, the 25,000 projected ADUs are a small portion of the 700,000 units city planners say are needed over the next decade. Experts acknowledge ADUs alone cannot solve housing shortages, but they add incremental supply in markets where any new rental unit helps address critical undersupply and upward rent pressure.
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