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Hendricks County, IN Building Safety: Carbon Monoxide Detectors (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Rule source
§ 150.39(C), county-modified R315.3
Alarm location
Outside sleeping areas, every level
Trigger
Fuel-fired appliance or attached garage opening
Bedroom exception
Alarm required inside if appliance is in bedroom
Penalty
$10-$200 per day, § 150.99(C)
Enforcer
County Building Commissioner

Summary

Hendricks County adopted a county-modified version of building code section R315.3, requiring carbon monoxide alarms outside sleeping areas and on every level of a dwelling that has a fuel-fired appliance or an attached garage opening into the home. A bedroom with a fuel-burning appliance needs its own alarm.

These county ordinances apply to unincorporated areas of Hendricks County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

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 and on each level of the residence if the dwelling unit contains a fuel-fired appliance and/or the unit has an attached garage with an opening that communicates with the dwelling unit. Where a fuel-burning appliance is located within a bedroom or its attached bathroom, a carbon monoxide alarm shall be installed within the bedroom.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2025 S-3: Supplement contains: Local legislation current through Ord. 2024-50, passed 12-10-2024; and State law current through Indiana Legislative Service, 2025 Acts, Pamphlet No. 3).

Full Breakdown

39 adopts state and International Code Council building rules by reference, then adds a county-specific modification in division (C), stating the county raised the standard above the base code. 3 Location provision requires carbon monoxide alarms in dwelling units to be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms, and on each level of the residence, whenever the dwelling unit contains a fuel-fired appliance or has an attached garage with an opening that communicates with the dwelling unit. Where a fuel-burning appliance sits within a bedroom or its attached bathroom, the alarm must be installed inside that bedroom itself rather than only outside it. 39(D). 42.

Violations & Fines

A violation of any provision within §§ 150.35 through 150.49, which includes the § 150.39(C) carbon monoxide alarm standard, carries a fine of not less than $10 nor more than $200 per § 150.99(C), with each day of noncompliance treated as a separate offense.

Frequently Asked Questions

When does Hendricks County require a carbon monoxide alarm?
Under the county-modified R315.3 in § 150.39(C), a dwelling unit needs carbon monoxide alarms outside each sleeping area and on every level if it has a fuel-fired appliance or an attached garage with an opening into the home.
Where exactly must the alarms go?
Alarms go outside each separate sleeping area, near the bedrooms, and on every level of the residence. If a fuel-burning appliance is located within a bedroom or its attached bathroom, an alarm must also be installed inside that bedroom.
What if a home doesn't have a fuel-fired appliance or attached garage?
The county's modified rule ties the alarm requirement to the presence of a fuel-fired appliance or an attached garage that opens into the dwelling, so a home without either condition does not trigger this specific § 150.39(C) mandate.

Sources & Official References

Other rules in Hendricks County

Parking Rules: Street Parking LimitsSome RestrictionsNoise Ordinances: Quiet HoursSome RestrictionsBuilding PermitsSome RestrictionsElectrical PermitsSome RestrictionsPlumbing PermitsSome RestrictionsBuilding InspectionsSome RestrictionsNoise Ordinances: Amplified Music & Outdoor SoundSome RestrictionsParking Rules: Abandoned VehiclesSignificant RestrictionsParking Rules: Driveway RulesSome RestrictionsFence Regulations: Fence Permit RequirementsFew Restrictions

All Hendricks County rules

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