Mariposa County staff pitches owner‑built rural dwelling program to expand affordable housing

Mariposa County Interim Building Director Karina Miranda told the Planning Commission on Oct. 10 that adoption of the state-aligned building code and Title 25 Housing and Community Development opens an opportunity for a Limited Density Owner‑Built Rural Dwelling program intended to lower costs for rural owner‑builders.

"For a county like Mariposa, this is a huge opportunity for housing to not require sprinklers and not require solar, which can be a huge expense," Miranda said during her presentation. She said staff will draft an ordinance that uses Title 25 guidance, seeks local input on eligible zones and owner‑occupancy terms, and will not permit substandard construction or waive wildfire‑urban interface (WUI) safety requirements.

Senior building inspector Justin Meisner described proposed inspection and health‑safety minimums for dwellings built under the program. "Inspections are very limited based on what the construction type is. It can be as little as 3 inspections," Meisner said, adding that the minimum livability set would include a toilet, handwashing sink, shower and food‑preparation surface. He also said local designers have offered to provide simple, pre‑approved plans to reduce costs for applicants.

Staff explained other likely program features under consideration: owner‑occupancy requirements (state minimum is one year, some counties use longer terms with hardship waivers), recorded notices on title explaining the construction standard and limits, prohibition on short‑term rentals, continued application of developer and school fees, and that wells, septic and applicable health code requirements remain necessary. Miranda said the department has already circulated a public survey to inform the draft and aims to present an ordinance in draft form to the board for initial readings in winter 2025–2026, with a target effective date in spring 2026.

Commission discussion focused on where the program should apply. Staff recommended allowing LDRD in all zones outside town planning areas to keep the ordinance straightforward and consistent with the program’s rural intent; commissioners asked that town planning areas be evaluated during the county’s pending general plan update. Commissioner Gray noted the county needs both zoning capacity and affordable construction options: "If it's not affordable for people to build, I don't see it happening," he said.

There was general concurrence from the commission to proceed with a countywide program limited to non‑town planning area zones and to return with a draft ordinance for formal review. Miranda said staff will continue public outreach and expects to return with a draft in December for commission review, then present it to the Board of Supervisors for hearings.