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La Plata County, CO Building Safety: Carbon Monoxide Detectors (2026)

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

Key Facts

Alarm location
Exterior of the sleeping area, within 15 feet of each bedroom door
Code section
La Plata County Code § 18-36, IRC R311.3
Adopted code
2024 International Residential Code with county amendments
Effective date
6/30/2026 under Res. No. 2026-14
Appeals
Board of Review under § 18-35(113.7)

Summary

In unincorporated La Plata County, Colorado, the county's replacement Section R311.3 of the 2024 International Residential Code requires carbon monoxide alarms on the exterior of the sleeping area within 15 feet of each bedroom door. The rule is in § 18-36 and took effect with Res. No. 2026-14 on 6/30/2026.

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

The volumes, parts, chapters, and appendices of the 2024 International Residential Code, as published by the International Code Council, together with the amendments, additions, and deletions as set forth in this section are hereby adopted pursuant to C.R.S. § 30-28-201(1). ... Section R311.3 shall be deleted in its entirety and replaced as follows: R311.3 Location. Carbon Monoxide alarms shall be installed on the exterior of the sleeping area within 15’ of each bedroom door.

Full Breakdown

Section 18-36 adopts the volumes, parts, chapters, and appendices of the 2024 International Residential Code as published by the International Code Council, together with the amendments, additions, and deletions set out in the section, pursuant to C.R.S. § 30-28-201(1). Its contents list names Section R311 Carbon Monoxide Alarms among the amended provisions.

Section R311.3 is deleted in its entirety and replaced by a Location rule. Carbon Monoxide alarms must be installed on the exterior of the sleeping area within 15 feet of each bedroom door. The section carries the history line Res. No. 2026-14 and the effective date 6/30/2026. The same distance, 15 feet from each bedroom door, appears in the county's Section R310.3 for smoke alarms, so both alarm types are located by reference to the bedroom doors.

The Building Department enforces the rule through the permit process in Section 18-35. Section 105.1 requires an owner or authorized agent to apply to the building official and obtain a permit before constructing, enlarging, altering, or repairing a building or structure, and applicants file on the Building Department Permit Portal under Section 105.3. Section 110.3.8 makes the final inspection depend on completion of all building components, and Section 111.1.1 ties the certificate of occupancy to compliance with all required inspections. Section 104.1 gives the building official authority to interpret the Code and adopt policies and procedures clarifying its application.

A person aggrieved by a building official decision can appeal to the Board of Review under Section 113.7. Its members must be residents of La Plata County, Colorado, aged 18 or older on the effective date of appointment (Section 113.4), and its meetings are open to the public under the Colorado Open Meetings Law. Section 104.8 states that adopting the Code creates no duty to any person and no private right of action against La Plata County or its building official.

Violations & Fines

Violating a residential code provision, including an alarm placed outside the required location on a permitted project, is a violation of the Code. Under Section 18-35(114.4), conviction carries a fine of not more than $100, and each day a violation continues is a separate offense. The County Attorney can seek an injunction, mandamus, or abatement. Work begun before a required permit brings an investigation fee under Section 109.4, at a minimum equal to the permit fee.

Frequently Asked Questions

Where must carbon monoxide alarms go in unincorporated La Plata County?
The county's replacement Section R311.3 says carbon monoxide alarms shall be installed on the exterior of the sleeping area within 15 feet of each bedroom door. It appears in Section 18-36, which amends the 2024 International Residential Code as adopted under C.R.S. § 30-28-201(1).
Is the carbon monoxide alarm distance the same as the smoke alarm distance?
Yes. Section R310.3 for smoke alarms and Section R311.3 for carbon monoxide alarms both use the exterior of the sleeping area within 15 feet of each bedroom door. Both replacement texts carry the Res. No. 2026-14 history line and the 6/30/2026 effective date.
Who enforces the carbon monoxide alarm rule?
The building official heads the Building Department and enforces the Code under Section 104.1, using permits under Section 105, inspections under Section 110, and certificates of occupancy under Section 111. Violations reach the County Attorney through Section 114.3, and the Board of Review hears appeals under Section 113.7.
Does the rule cover Durango, Bayfield, or Ignacio?
This county provision governs the unincorporated area, and the code's own sign amendment refers to the unincorporated portions of the County. Bayfield, Ignacio, and the City of Durango each govern their own limits, and tribal trust land is governed by the Southern Ute Tribe, so a property inside one of those jurisdictions follows that government's rules.

Sources & Official References

Other rules in La Plata County

All La Plata County rules

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