Calaveras County, CA Building Safety: Carbon Monoxide Detectors (2026)
Key Facts
- Governs
- Limited density owner-built rural dwellings, Chapter 15.12
- Alarm standard
- California Residential Code smoke/CO alarm requirement
- Battery alternative
- Minimum 10-year battery if dwelling is unwired
- Permit prerequisite
- Building permit required under § 15.12.080
- Enforcement
- Public nuisance abatement, § 15.12.060
Summary
Within Chapter 15.12, Calaveras County's rules for limited density owner-built rural dwellings, County Code § 15.12.310 requires carbon monoxide alarms installed per the current California Residential Code, with battery-only alarms carrying a minimum ten-year battery allowed where the dwelling has no electrical wiring installed.
Where electrical wiring or appliances are installed, the installation shall be in accordance with the applicable requirements contained in the most recently adopted version of the California Electrical Code, Part 3, Title 24, California Code of Regulations. Smoke and carbon monoxide alarms shall be installed per the most current adopted California Residential Code. If electrical wiring is not being installed, alarms may be battery operated and must contain minimum ten-year batteries.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 23 Update 2).
Full Breakdown
E, built and occupied by the owner or the owner's family rather than for sale, lease, rent or employee occupancy. 300 lets such a dwelling forgo electrical power entirely, it need not be wired or fitted for electrification at all. 310 requires that work to follow the current California Electrical Code and requires smoke and carbon monoxide alarms installed per the current California Residential Code; if the dwelling has no electrical wiring, the alarms may instead be battery operated, provided the batteries are rated for a minimum of ten years.
320 carves out a partial exception for structures where electrical use is confined to one or more rooms, such as a single workshop or kitchen, letting the rest of the structure stay unwired unless the building official determines demand will exceed that room's capacity. 070.
Violations & Fines
A structure built under Chapter 15.12 that fails to meet its requirements, including the CO alarm standard, can be found a "substandard building" and declared a public nuisance under § 15.12.060. The building official may order it abated under Chapter 8.06's abatement procedures, unless abatement is deferred for extreme hardship, with administrative abatement pursued as the first remedy before other enforcement is used.
Frequently Asked Questions
Do owner-built rural dwellings in Calaveras County need CO alarms?
What if my rural dwelling has no electrical wiring?
What happens if a rural dwelling doesn't meet the alarm requirement?
Sources & Official References
Other rules in Calaveras County
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