How Much Does Smoke Detector Installation Cost in San Francisco, CA? (2026)

Average Cost

$2,230–$4,469

Materials

$1,440–$3,048

Labor (San Francisco)

$344–$527

Labor rates in San Francisco are +35% compared to Sacramento Metro baseline.

Professional smoke detector installation ensures your home meets California's stringent fire safety requirements. We install hardwired, interconnected smoke alarms (when one sounds, all sound) with battery backup in every bedroom, outside each sleeping area, and on every level of the home. Combination smoke/CO (carbon monoxide) detectors are installed where gas appliances or an attached garage are present. For homes without existing wiring, we run new circuits from the panel. California law requires working smoke detectors in all residential properties, and NorCal's fire risk makes this especially critical.

NorCal's wildfire risk makes functional smoke detectors critical. During fire season, smoke from distant wildfires can trigger sensitive detectors — photoelectric sensors are recommended over ionization types for reduced false alarms from wildfire haze.

San Francisco is located in San Francisco County (San Francisco). Iconic fog city with Victorian painted ladies, Edwardian flats, and modern high-rises. The local utility provider is PG&E.

Cost Calculator

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City

Detectors

Materials Included

Hardwired Smoke/CO Combo Detector (interconnectable)36 each

$900–$1,980

14/3 NM-B Wire (for interconnect, per 50 ft)12 roll

$360–$600

Ceiling Mounting Plates & Hardware36 each

$72–$180

10-Year Sealed Backup Batteries36 each

$108–$288

Labor(San Francisco +35%)

Licensed Electrician3h @ $115–$176/hr

$344–$527

Contractor Markup25%

0%Avg 30%100%

Materials

$1,440–$3,048

Labor

$344–$527

Markup

$446–$894

Estimated Total Cost

$2,230 – $4,469

$372–$745 per unit

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California Building Code

California Health & Safety Code Section 13113.7 requires smoke alarms in all residential dwellings. CRC Section R314 requires interconnected, hardwired smoke alarms in new construction. CO alarms are required per CRC Section R315 in homes with fuel-burning appliances or attached garages.

Project Timeline

Assessment & Planning

15-20 min

Walk the home to determine detector locations per California code — inside each bedroom, outside each sleeping area, on every level, and near gas appliances. Check for existing wiring.

Wiring & Mounting

1-3 hrs

Run 14/3 NM-B cable to connect all detectors on a common interconnect wire (red traveler). Install ceiling mounting plates at each location, pulling wire through the attic or ceiling cavities.

Detector Installation & Testing

30-45 min

Mount each detector on its base plate, connect the wiring, and install backup batteries. Test the interconnect function — pressing the test button on one detector should sound all detectors throughout the home.

Materials Breakdown

Material	Qty	Unit	Unit Cost	Total
Hardwired Smoke/CO Combo Detector (interconnectable)	36	each	$25–$55	$900–$1,980
14/3 NM-B Wire (for interconnect, per 50 ft)	12	roll	$30–$50	$360–$600
Ceiling Mounting Plates & Hardware	36	each	$2–$5	$72–$180
10-Year Sealed Backup Batteries	36	each	$3–$8	$108–$288

Smoke Detector Installation in San Francisco — FAQ

How many smoke detectors does my home need?+

California law requires a smoke detector inside each bedroom, outside each sleeping area (hallway), on every level of the home (including basement), and a CO detector where gas appliances or an attached garage are present. A typical 3-bedroom home needs 5-7 detectors.

How much does smoke detector installation cost?+

Hardwired, interconnected smoke/CO detector installation costs $75-$150 per detector in NorCal, including the unit, wiring, and labor. A full 6-detector installation runs $450-$900.

Do I need hardwired or battery-only smoke detectors?+

California requires hardwired, interconnected smoke alarms with battery backup in all new construction and major remodels. Existing homes may use battery-only sealed 10-year units, but hardwired interconnected systems are strongly recommended for safety.

How often should smoke detectors be replaced?+

Smoke detectors should be replaced every 10 years. CO detectors should be replaced every 5-7 years. Check the manufacture date on the back of each unit. We recommend setting a calendar reminder for replacement.