How Much Does Smoke Detector Installation Cost? [2026 Data]

Smoke detector installation costs $50–$250 per unit. Battery-only units run $25–$75 installed. Hardwired interconnected systems cost $150–$250 per detector.

Building codes often require hardwired units in new construction. CO detectors add $30–$80 each.

Place one per floor and outside bedrooms minimum. Interconnection ensures all alarms sound together—worth the extra cost.