Smoke Detector Installation Cost Guide for Electricians
Electricians should charge $75–$150 per smoke detector for replacing existing hardwired units, and $150–$300 per detector for new hardwired installations with wiring. A complete home smoke and CO detector upgrade (6–10 units, hardwired and interconnected) runs $800–$2,000. Battery-only detector swaps are not typically electrician work, but hardwired and interconnected systems require licensed installation.
Smoke and CO detector work is a reliable add-on service that every residential electrician should offer. While individual detector replacements are small jobs, whole-home upgrades to hardwired, interconnected systems are profitable — and code changes driving the adoption of sealed 10-year battery detectors and combination smoke/CO units keep demand strong. This work also positions you as the safety-conscious electrician that homeowners trust and refer.
Detector Types and Product Selection
Modern smoke detectors fall into three categories. Hardwired with battery backup are the standard for new construction and remodels — they connect to a dedicated circuit and interconnect so all alarms sound when one triggers. Top brands include Kidde (Firex series at $15–$30 wholesale) and First Alert (BRK series at $15–$30). Wireless interconnected battery detectors (Kidde RF or First Alert Onelink at $30–$50 each) communicate wirelessly and are ideal for retrofit when running new wire is impractical. Combination smoke/CO detectors (Kidde KN-COSM-IBA at $25–$40 or First Alert SC9120B at $25–$35) detect both smoke and carbon monoxide in a single unit — NEC and most state codes now require CO detection near sleeping areas in homes with gas appliances or attached garages. Recommend combination units to simplify installations and reduce the total number of devices needed.
Code Requirements and Placement
NEC and NFPA 72 dictate smoke detector placement. Required locations include: inside each bedroom, outside each sleeping area (hallway), on every level of the home including the basement, and in the living room or near stairways. CO detectors are required outside sleeping areas on each level with gas appliances or an attached garage. For new construction and remodels, detectors must be hardwired to a dedicated circuit, interconnected (when one sounds, all sound), and equipped with battery backup. Most jurisdictions require detectors within 12 inches of the ceiling (wall-mounted) or centered on the ceiling (preferred). Keep detectors at least 4 inches from wall/ceiling corners and away from kitchens, bathrooms, and HVAC vents to reduce nuisance alarms. A typical 3-bedroom, 2-story home needs 6–8 smoke detectors and 2–3 CO detectors for full code compliance.
Hardwired Detector Replacement Pricing
Replacing existing hardwired detectors is quick work — disconnect the old unit, connect the new one using the existing wiring harness (or swap the harness adapter), mount, and test. Each replacement takes 10–15 minutes. The challenge is that most homeowners wait until a detector starts chirping and call you for one unit. Set a minimum service call of $125–$175 and price the first detector replacement at that minimum. Additional detectors in the same visit should be $50–$75 each (labor) plus the cost of the detector. For a whole-home replacement of 6–8 existing hardwired detectors, price at $400–$800 total (detectors included). Always test all detectors after replacement — press the test button on one and verify all interconnected units alarm. Replace all detectors in a home at the same time rather than one at a time — detectors have a 10-year lifespan and should all be on the same replacement schedule.
New Hardwired Detector Installation
New hardwired detector installations involve running 14/2 (power) and 14/3 (interconnect) cable from the panel to each detector location, installing junction boxes or detector-specific mounting brackets, and connecting all units. In new construction with open ceilings, this is straightforward work — plan 30–45 minutes per detector including wiring. In existing homes, fishing cable through finished ceilings is the time driver. Attic access makes the job dramatically easier — you can run cable through the attic and drop down to each detector location in 20–30 minutes per unit. Without attic access, each detector requires fishing cable through finished ceilings at 45–90 minutes per unit. Price new hardwired installations at $150–$300 per detector depending on access. A complete new installation of 8 detectors with a dedicated circuit runs $1,200–$2,000 in homes with attic access and $1,800–$3,000 in homes without.
Wireless Interconnected Systems
For retrofit situations where running new interconnect wire is impractical or too expensive, wireless interconnected detectors are a smart alternative. Kidde RF-SM-ACDC ($35–$45 each) and First Alert Onelink ($40–$55 each) use wireless signals to interconnect without the 3-wire cable. Each detector still needs a power source — either hardwired from the existing circuit or battery-only (sealed 10-year lithium battery models). The wireless approach saves significant labor in retrofit installations: instead of fishing interconnect cable to each location (1–2 hours per detector), you install each detector at its existing power location and program the wireless pairing (10–15 minutes per unit). Price wireless interconnected upgrades at $75–$125 per detector including the device and programming. A 6-detector wireless upgrade runs $500–$800 — less than hardwired interconnect but still profitable work. The tradeoff is ongoing battery replacement on battery-only models, which you should mention to the homeowner.
Upsell Opportunities and Service Bundles
Every smoke detector call is an opportunity to sell additional safety and electrical work. Natural upsells include: CO detectors in homes that only have smoke detectors ($75–$150 each installed), whole-house surge protection to protect smart detectors and other electronics ($300–$600), GFCI upgrades in kitchens, bathrooms, and garages that lack them ($100–$200 per outlet), and arc-fault circuit interrupter (AFCI) breakers for bedroom circuits ($75–$150 per breaker replacement). Smart smoke detectors like Google Nest Protect ($100–$120 retail) or First Alert Onelink Safe & Sound ($200–$250) appeal to tech-forward homeowners and command higher installation fees. Bundle detector work with an electrical safety inspection ($150–$250) to identify all safety-related opportunities in the home. Position detector replacement as part of a "home safety upgrade" rather than a standalone service — the broader framing naturally leads to larger project scopes.
Frequently Asked Questions
Smoke detectors should be replaced every 10 years regardless of whether they appear to function. The sensing chamber degrades over time, reducing reliability. CO detectors should be replaced every 5–7 years depending on the manufacturer. Check the manufacturing date on the back of each unit — if there is no date or the date is unreadable, the detector needs replacement.
Create Professional Estimates in Minutes
Stop spending hours on estimates. QuotrPro uses AI to help electricians create accurate, professional proposals that win more jobs.
Try Free for 3 DaysNo credit card required · 30-day money-back guarantee
Related Articles
Electrical Inspection Pricing Guide for Electricians
How to price residential electrical inspections. Covers home buyer inspections, insurance inspections, safety audits, and how to convert inspections into jobs.
Whole-House Surge Protector Installation Cost for Electricians
How to price whole-house surge protector installations. Covers SPD types, panel mounting, warranty value, and profit margins for residential electricians.
Whole-House Rewiring Cost: What Electricians Should Charge
Complete guide to pricing whole-house rewiring jobs. Covers material costs, labor hours, permit fees, and profit margins for residential electricians.
Electrical Outlet and Switch Pricing for Electricians
How to price outlet and switch installations. Covers GFCI, AFCI, USB, smart switches, 240V outlets, and profit margins for residential electricians.
More Electricians Estimating Guides
No credit card required