Smoke & CO Detector
A hardwired or battery-powered device that detects smoke or carbon monoxide and alarms occupants.
Quick answer
Smoke & CO Detector: A hardwired or battery-powered device that detects smoke or carbon monoxide and alarms occupants. Typical cost: $30–$80 per unit; $150–$300 per unit installed and interconnected..
Why it matters
Code now requires interconnected smoke detectors on every level and outside every sleeping area; non-compliant systems cause failed home inspections.
Typical cost
$30–$80 per unit; $150–$300 per unit installed and interconnected.
Pros
- • Code-required
- • 10-year sealed-battery models reduce maintenance
Cons
- • Hardwired versions need access to attic or wall cavity
Common uses
- • Every level and bedroom of every dwelling
Alternatives
10-year sealed-battery standalone units
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Frequently asked questions
- How often replace smoke detectors?
- Every 10 years — the sensor degrades regardless of battery condition.
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Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.