Boone County, MO Fire Regulations: Smoke Detectors (2026)
Key Facts
- Interconnection
- Not required in alterations, ≤2 stories
- Power source
- Battery-operated allowed in alterations
- Height limit
- Applies to buildings 2 stories or less
- Governing code
- IRC 2015 as amended locally
Summary
Boone County's amendments to the adopted IRC let smoke alarms added during an alteration of a two-story-or-less home skip interconnection and run on batteries instead of the code's standard hard-wired, interconnected setup.
R314.4 Add to exception, "In alterations smoke alarms shall not be required to be interconnected if the dwelling is no more than 2 stories." R314.6 Add exception #3, "Smoke alarms in alterations shall be permitted to be battery operated if the dwelling is no more than 2 stories."
Official source re-checked September 7, 2026: the cited page had not changed since it was quoted.
Full Breakdown
The IRC as adopted by Boone County generally requires smoke alarms to be hard-wired and interconnected. Two county amendments soften that for existing homes undergoing alterations: R314.4 provides that smoke alarms added during an alteration need not be interconnected with each other if the dwelling is no more than two stories, and R314.6 adds a third exception letting those alarms be battery-operated rather than hard-wired under the same two-story limit. New construction, and alterations to homes over two stories, still fall under the standard hard-wired, interconnected smoke alarm rule.
Violations & Fines
Skipping smoke alarms entirely, or installing non-interconnected or battery-only alarms in a dwelling over two stories, is a Building Code violation enforceable by the Resource Management Department.
Frequently Asked Questions
Do smoke alarms have to be hard-wired and interconnected in Boone County?
Which code governs smoke alarms in unincorporated Boone County?
Sources & Official References
Other rules in Boone County
Compare Boone County to another location·View the Missouri fire regulations overview
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