Bolthole Index county-legal census · checked 2026-10-10
5 of California's 58 counties — 9% — set no minimum dwelling size. That is the 22nd-largest count of any state. The strongest of them on the Bolthole Index is Trinity County (51/100). Every entry below cites the county’s own official source.
Rules change, and cities inside these counties set their own — treat this as a verified starting point, not legal advice. All 587 counties nationwide → California: owner-builder → California: rv living → California: tiny homes → Full California profile →
5 of 58 California counties · sorted by Index score
General residential dwelling unit sizes regulated by Trinity County zoning in unincorporated Trinity County. The county statement is subject to applicable state health and safet…
Trinity County 2019-2024 Housing Element Update ↗Second housing units in Mariposa County single-family residential districts. The secondary residence must conform to all applicable health, safety, and setback regulations. The …
County of Mariposa General Plan – Volume I ↗Detached accessory dwelling units in San Benito County zoning districts that permit single-family or multi-family homes. The minimum-size exception is limited by the requirement…
§ 25.08.002 Accessory Dwelling Units and Innovative Housing ↗Residential dwelling unit size under Santa Cruz County zoning and building ordinances in unincorporated Santa Cruz County. The County Housing Element states that the zoning or b…
2023 Housing Element, Appendix HE-D: Housing Constraints ↗County-imposed minimum size for residential dwelling units in unincorporated Inyo County. The County source expressly states that the County does not regulate the minimum size o…
Planning Commission Packet 02.26.25 ↗Every county here has a full profile — water, land prices, hazard safety, seclusion, and the rest of its building rules. See the California state page for all 58 counties ranked, or go back to the national list.
Off-grid gear
Building on land in one of these California counties? The kit we'd start with:
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General guidance, not legal advice. Off-grid, building, and land-use rules are often set at the county level and change often. Verify with your county and state before acting. Data reviewed 2026-06-26.
