Montgomery County has no separate smoke-detector code. Requirements come from the Pennsylvania Uniform Construction Code (adopting the International Codes) for new and altered buildings, and from PA landlord law requiring working smoke detectors in rental units.
Smoke- and carbon-monoxide-detector requirements in Montgomery County are set by state law and enforced by municipal building code officials, not by the county. The Pennsylvania Uniform Construction Code (UCC, 35 P.S. §7210.101 et seq.; regulations at 34 Pa. Code Ch. 403), which adopts the International Residential Code and International Building Code, requires smoke alarms in new construction and substantial alterations in every sleeping room, outside each sleeping area, and on each level, interconnected and hard-wired with battery backup. For carbon monoxide, Pennsylvania's Act 121 of 2013 (68 P.S. §75.101 et seq.) requires approved CO alarms in multifamily dwellings and rentals that have fossil-fuel appliances or attached garages. Landlord-tenant obligations to install and maintain working detectors also flow from these statutes
Missing or non-working detectors are enforced by the municipal building code official under the UCC and property-maintenance code, and by landlord-tenant remedies. Penalties are summary offenses with local fines; rental units may fail inspection or licensing until compliant.
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