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Maricopa County, AZ Fire Regulations: Smoke Detectors (2026)

Heavy Restrictions

Verified 1 week ago|Source: ARS Section 36-1637 - Smoke detectors; residential housing →

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Key Facts

State Authority: ARS Section 36-1637
When Required (New Construction): Each new residential housing unit
When Required (Remodel): Permitted remodel of any sleeping area
Tenant Duty: Maintain and keep operable

City-specific rules exist: Surprise, Phoenix, Chandler, Glendale, Scottsdale, Gilbert, Tempe, Peoria, and Mesa have their own smoke detectors rules that differ from Maricopa County's county-level regulations. If you live in one of those cities, check the city-specific page instead.

Summary

Unincorporated Maricopa County applies Arizona Revised Statutes Section 36-1637, which requires an approved smoke detector in each new residential housing unit and in any existing unit where a sleeping area is remodeled under permit. Tenants maintain the device; landlords must repair after written notice and notify tenants of these duties.

Full Breakdown

Arizona Revised Statutes Section 36-1637 requires an approved smoke detector to be installed during construction in each new residential housing unit in Arizona, and in any existing unit when a sleeping area is remodeled and that remodeling requires a permit from the local political subdivision. The tenant must keep the detector operable but, on written notice of malfunction, the landlord is responsible for the repair. The landlord must give the tenant written notice of these responsibilities. Maricopa County enforces this through Planning & Development building permits and adopted construction codes; the 2018 International Residential Code (as adopted by the county) imposes additional placement, interconnection, and power requirements (R314), including smoke alarms in each sleeping room, outside each separate sleeping area, and on every story. STR operators in unincorporated areas should also confirm fire-marshal expectations under ARS 11-269.17 health and safety authority. Confirm with Maricopa County Planning & Development at (602) 506-3301.

Violations & Fines

A new dwelling or remodeled sleeping area without an approved smoke detector fails inspection and can support a stop-work or correction order. A landlord who fails to repair after written notice from the tenant, or who fails to give the required written notice of responsibilities, violates Section 36-1637.

Frequently Asked Questions

Does unincorporated Maricopa County require smoke detectors in homes?

Yes. Arizona Revised Statutes Section 36-1637 requires an approved smoke detector in each new residential housing unit during construction, and in any existing unit where a sleeping area is remodeled under permit. The Maricopa County Planning & Development Department enforces this through building permits and the adopted International Residential Code, which adds placement and power-source requirements under Section R314.

Who is responsible for maintaining smoke detectors in a Maricopa County rental?

Section 36-1637 places the duty on the tenant to maintain and keep the smoke detector operable. Once the tenant provides the landlord with written notice of a malfunction, the landlord is responsible for the repair. The landlord must also give the tenant written notice of the tenant's responsibilities under the statute.

Where do smoke alarms have to be installed in a new home in unincorporated Maricopa County?

Maricopa County enforces the International Residential Code Section R314 as part of its adopted building codes. R314 requires smoke alarms inside each sleeping room, outside each separate sleeping area in the immediate vicinity of bedrooms, and on every story of the dwelling, including basements. New construction units must be hard-wired with battery backup and interconnected so all alarms sound when one is triggered.

Maricopa County, AZ Fire Regulations: Smoke Detectors (2026)

Key Facts

Summary

Full Breakdown

Violations & Fines

Frequently Asked Questions

Sources & Official References

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