Caldwell, ID Building Safety: Carbon Monoxide Detectors (2026)
Key Facts
- Governing section
- § 12-01-21 (amends IRC R315.2)
- Trigger
- Permitted work in home with garage or fuel appliance
- Exempt work
- Exterior-only jobs and electrical-only permits
- Exempt systems
- Non-combustion plumbing or mechanical repairs
- Standard used
- Alarms per IRC section R315.1
Summary
Caldwell requires carbon monoxide alarms whenever permitted work occurs in an existing dwelling with an attached garage or a fuel-fired appliance. City Code § 12-01-21 amends IRC section R315.2 to trigger the alarm requirement on permit work, with exceptions for exterior-only and non-combustion plumbing or mechanical jobs.
IRC section R315.2, "Carbon Monoxide Alarms Where Required In Existing Dwellings" is amended to read: "Where work requiring a permit occurs in existing dwellings that have attached garages or in existing dwellings within which fuel fired appliances exist, carbon monoxide alarms shall be provided in accordance with section R315.1. Exceptions: 1. Work involving the exterior surfaces of dwellings, such as, but not limited to, replacement of roofing or siding, or the addition or replacement of windows or doors, or the addition of a porch or deck, or electrical permits, are exempt from the requirements of this section. 2. Installation, alteration or repairs of non-combustion plumbing or mechanical systems are exempt from the requirements of this section.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 Code: Local legislation current through Ordinance 3747, passed 3-16-2026).
Full Breakdown
1. In practice that means a homeowner who pulls a permit for a remodel, addition or system replacement in a home with an attached garage or a gas furnace, water heater or similar appliance has to bring the home's carbon monoxide protection up to the current alarm standard as part of that permitted work, even if the alarm requirement was not triggered when the house was originally built. The amendment carries two exceptions: work limited to a dwelling's exterior surfaces, such as replacing roofing, siding, windows, doors, or adding a porch or deck, or obtaining only an electrical permit, does not trigger the alarm requirement, and neither does installing, altering or repairing non-combustion plumbing or mechanical systems.
2 in identical terms, so the exterior-work and non-combustion-systems carve-outs apply consistently across the code's several carbon monoxide provisions rather than just the one section.
Violations & Fines
Failing to install the required carbon monoxide alarms when triggering permit work occurs under § 12-01-21 is enforced through Caldwell's general building permit and inspection process, prosecuted as a misdemeanor under the citywide penalty clause § 01-01-05, with fines capped at the Idaho Code § 50-302 limit.
Frequently Asked Questions
When do I have to add CO alarms to an older Caldwell home?
Does re-roofing my house trigger the CO alarm requirement?
What about a plumbing repair, does that require CO alarms?
Sources & Official References
Other rules in Caldwell
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