Smoke & CO Detector Installation Cost in Los Angeles:
Complete Guide [2026]
C-10 Licensed #981578
$150–$300 Per Unit
CA Code Compliant
What smoke and CO detector installation costs in Los Angeles in 2026: hardwired pricing, California code, placement, interconnection, permits, and how the process runs from a C-10 licensed team.
Published: October 2026 · Updated: October 2026
Need Smoke/CO Detectors in LA?
AMY Electric installs hardwired, interconnected smoke and CO detectors to California code — all priced in writing before work begins. C-10 #981578.
01 · Pricing
What Smoke & CO Detector Installation Costs in Los Angeles
Smoke and CO detectors are required by California code. Hardwired, interconnected units are the safest. These are the prices AMY Electric publishes for Los Angeles projects in 2026:
| Scope / Item | Typical Range | Notes |
|---|---|---|
| Hardwired Smoke Detector (per unit) | $150 – $300 | Includes device, wiring, interconnection |
| Hardwired CO Detector (per unit) | $150 – $300 | Includes device, wiring, interconnection |
| Combo Smoke/CO (per unit) | $200 – $400 | Single device, both sensors |
| Whole-Home Package (4-6 units) | $800 – $2,000 | Full home, interconnected |
| Battery-Only (mount) | $50 – $100 | No wiring; battery-powered only |
| LADBS Permit (if new circuit) | $200 – $450 | Included when required |
Ranges reflect Los Angeles labor rates. Estimates are free and provided in writing.
02 · California code
California Code Requirements for Smoke & CO Detectors
- Hardwired with battery backup. California requires hardwired smoke detectors with battery backup in most homes.
- Interconnection. All alarms must be interconnected so when one sounds, all sound.
- Placement. Smoke detectors in every bedroom, outside sleeping areas, and on every level. CO detectors outside sleeping areas and on every level with fuel-burning appliances.
- Remodel trigger. New construction and remodels must comply with current code.
03 · Placement
Where Smoke and CO Detectors Should Be Placed
Bedrooms
Inside every bedroom and sleeping area.
Outside Sleeping Areas
In the hallway or area adjacent to bedrooms.
Every Level
At least one detector on every level of the home.
CO Near Appliances
Outside sleeping areas and near fuel-burning appliances.
04 · Permits
Permit Considerations in LA
- No permit for same-circuit swap. Replacing detectors in an existing circuit is typically permit-exempt.
- Permit for new wiring. Running new cable or adding a circuit requires an LADBS electrical permit and inspection.
- Permit fees included. When required, LADBS fees ($200–$450) are included in our all-in quotes.
Los Angeles uses LADBS for electrical permitting. Never hire a contractor who suggests skipping a permit on new wiring work.
05 · Process
Our Smoke & CO Detector Installation Process
- Site visit. We assess existing detectors, wiring, and code requirements, then provide a written estimate.
- Detector selection. We recommend hardwired, interconnected units per California code.
- Permit filing (if needed). We file the LADBS permit before new wiring work.
- Installation. We install detectors, wire interconnection, and test in one visit.
- Inspection (if needed). LADBS inspects; we attend and provide the passed inspection record.
- Testing. We test all units and demonstrate the interconnection.
06 · FAQ
Frequently Asked Questions
How much does smoke and CO detector installation cost in Los Angeles?
Smoke and CO detector installation in Los Angeles costs $150 to $300 per hardwired unit. A whole-home package (4-6 units) runs $800 to $2,000. Costs depend on unit type, wiring, and interconnection. AMY Electric provides firm written quotes after a site visit.
Does California require hardwired smoke detectors?
Yes. California requires hardwired smoke detectors with battery backup in most homes, interconnected so all alarms sound together. New construction and remodels must comply. AMY Electric installs to California code.
Where should smoke and CO detectors be placed?
Smoke detectors are required in every bedroom, outside sleeping areas, and on every level. CO detectors are required outside sleeping areas and on every level with fuel-burning appliances. AMY Electric places units per code.
What is interconnection?
Interconnection means all alarms are wired together so when one sounds, all sound. This is required by California code for hardwired systems. AMY Electric wires the interconnection during installation.
Do I need a permit for smoke/CO detector installation?
Replacing detectors in an existing circuit is usually permit-exempt. New wiring or a new circuit requires an LADBS electrical permit. AMY Electric files any required permits and attends the inspection.
Need Smoke/CO Detectors?
AMY Electric provides free written estimates for detector installation across Greater Los Angeles. C-10 #981578.