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County pilot would help seniors build backyard units, then sell the main house

Alameda County's housing department is developing a senior ADU pilot under its SHIFT program; outreach to homeowners is expected in early 2027, with a goal of 10 units in the first phase and 50 over the next two years.

Reese Hardy

October 12, 20262 min read

Alameda County is building a pilot program meant to let older homeowners stay in their neighborhoods by moving into a new backyard cottage and selling the main house to pay for it, the San Francisco Chronicle reported Sunday.

The senior ADU pilot is part of the county Housing and Community Development Department's Scalable Housing Infill Funding Toolkit, known as SHIFT. Outreach to find homeowners who want to take part is expected to start in early 2027, according to the Chronicle.

How it is supposed to work

As the Chronicle described it, a senior who owns a single-family home would build an accessory dwelling unit on the lot and move into it. The owner would use Proposition 19 to carry the home's low property tax basis to the new unit, split the lot under the state's SB 9 lot-split law, and sell the original house.

The sale would pay off the construction loan and leave the owner with some cash in reserve.

County Housing Director Michelle Starratt told the paper the idea grew out of an ADU workbook the department was preparing several years ago, when many interested homeowners turned out to be seniors with valuable houses but limited income who could not qualify for ordinary construction loans.

Renting out a backyard unit did not suit many of them, she said, because of the training needed and the work of managing tenants.

Starratt's goal is 10 units in the first phase and 50 finished within the two years after that, she told the paper.

Questions raised

Karen Chapple, a UC Berkeley professor emerita of city and regional planning who now directs the School of Cities at the University of Toronto, told the Chronicle she was glad to see a program aimed at fixed-income seniors.

She and Starratt both acknowledged possible pitfalls: some seniors may not want to live behind the house they sold, and buyers may wonder what they owe a neighbor who gave it up.

She also pointed to a 2025 report she co-wrote on SB 9, which found that many owners still paying mortgages discovered their lenders were reluctant to let them split and sell off part of a lot. In the law's first two years, the report found, only 266 projects statewide were permitted or completed.

Starratt said the county is watching for personal and legal problems as it refines the program.

Where it stands

The county's SHIFT web page says it sought firms to design, launch and run the senior pilot, with qualifications due Oct. 9. The broader SHIFT effort is developing pre-approved home designs with an Oakland firm, Inspired ADUs, aimed at small infill lots across the county, and the page says the designs will be made public.

The Chronicle story did not say which cities' homeowners will be eligible. Pleasanton residents interested in the pilot can contact the county department through the SHIFT page at achcd.org/shift.

Sources

sfchronicle.com

achcd.org

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Reese Hardy

Reese Hardy writes about community life, schools, public safety, and local events in Pleasanton.

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