From the 2018 International Residential Code unless otherwise indicated.
Carbon monoxide alarms shall be listed in accordance with UL 2034.Combination carbon monoxide alarms and smoke alarms shall be listed in accordance with UL2034 and UL217.
R315.2.1 - New Construction.
For new construction, carbon monoxide alarms shall be provided in dwelling units where either or both of the following conditions exist.
The dwelling unit contains a fuel-fired appliance.
The dwelling unit has an attached garage with an opening that communicates with the dwelling unit.
R315.2.2 Alterations, Repairs and Additions.
Where alterations, repairs or additions requiring a permit occur, the individual dwelling unit shall be equipped with carbon monoxide alarms located as required for new dwellings. Exceptions: 1. Work involving the exterior surfaces of dwellings, such as the replacement of roofing or siding, or addition or replacement of windows or doors, or the addition of a porch or deck. 2. Installation, alteration or repairs of plumbing or mechanical systems.
R315.3 - Location.
Carbon monoxide alarms in dwelling units shall be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms.
Note: State law, HB09-1091, View exit disclaimer policy page for links to third-party websites. requires owners of dwelling units with either attached garages or fuel-fired appliances to install carbon monoxide alarms when the home undergoes "interior alterations, repairs, fuel-fired appliance replacement, or additions, any of which require a building permit."