Mariposa supervisors introduce owner‑built rural dwellings ordinance, strike 'public nuisance' clause

Mariposa County’s Board of Supervisors on Jan. 20 introduced a new ordinance to allow limited‑density, owner‑built rural dwellings under the authority of Title 25 of the California Code of Regulations, and unanimously agreed to remove a proposed provision labeling violations a “public nuisance.”

The measure, presented by interim building director Karina Miranda and senior building inspector Justin Meiser, is intended to provide an alternative permitting pathway for owner‑occupied rural homes, permit legalization of some existing unpermitted structures, support wildfire recovery and increase affordability by allowing certain alternative construction materials and simplified plans. Miranda said the ordinance is modeled on an approach used by about 14 other California counties and that it is “owner built, owner occupied dwellings or the owner’s family. It is not intended for serial development.”

Supporters and staff said the LDRD (limited density rural dwellings) alternative will not exempt structures from life‑safety requirements: permits and inspections remain required, WUI (wildland‑urban interface) and other fire, wind, seismic and sanitation standards still apply, and the county will record a notice on the property disclosing the alternative construction standard and a restriction against short‑term rentals during the required owner‑occupancy period. The presentation estimated more than 200 homes lost countywide to wildfire and severe weather since 2017 and said Title 25 provides the legal authority for this alternative pathway.

Supervisors pressed staff on technical standards, enforcement and implementation. Several asked that the county publish the technical standards, interpretation database and checklists staff said they will develop so owner‑builders can plan in advance. Miranda told the board staff had already consulted multiple counties with established programs and will produce preapproved plan sets and outreach materials.

A focal point of the debate was a proposed section (15.40.280) that would have declared certain violations under the chapter a “public nuisance.” Supervisor Poe and others raised concerns that the phrase carries legal consequences under California law and urged additional legal review. County counsel explained the distinction between a nuisance in fact (the Civil Code definition) and a nuisance per se based on ordinance violation; counsel and the CAO recommended removing the provision from this ordinance and addressing nuisance language in Title 1 or with more deliberate legal drafting. Supervisor Mnintree moved, and Supervisor Keiser seconded, to waive first reading, introduce the ordinance and strike section 15.40.280; the motion passed unanimously.

Supervisors also debated a provision requiring a structure around a generator used as a primary power source and a 55‑decibel noise limit. Staff said the structure provision was intended to reduce both noise impacts and the long‑term fire risk of generators run continuously as primary power; supervisors suggested alternatives such as measuring decibel limits at the nearest property line and ensuring installations meet fire‑safety inspection standards. Staff said inspections and installation reviews are part of the permit process and reiterated the primary‑power requirement excludes temporary backup use.

The board set the ordinance for second reading in 10 days; staff said, if adopted, the ordinance would take effect 30 days after adoption and that permit fees and the separate Title 25 permit form will be returned to the board for establishment. The board amended the first reading language to reflect the struck section and asked staff to return clean, renumbered text for the second reading.