Smoke detectors are required by Pennsylvania's building codes, not by Delaware County. The PA Uniform Construction Code adopts the International Residential Code, which mandates smoke alarms in each bedroom, outside sleeping areas, and on every level of a dwelling.
Delaware County has no separate smoke-detector ordinance. The Pennsylvania Uniform Construction Code (Act 45 of 1999) adopts the International Residential Code, whose §R314 requires smoke alarms in each sleeping room, immediately outside each sleeping area, and on every story including basements. New construction and major renovations must use interconnected, hard-wired alarms with battery backup. Rental units are inspected under municipal rental-licensing programs and the property-maintenance code. Pennsylvania's Carbon Monoxide Alarm Standards Act (Act 121 of 2013) separately requires CO alarms in many rentals and multifamily buildings with fuel-burning appliances or attached garages.
Enforced by the municipal building code official and rental-inspection program; missing or non-working alarms can fail inspection and bring citations and fines under local ordinance.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Delaware County's smoke detectors rules stack up against other locations.
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