The cost to install a carbon monoxide detector depends on the type of detector, number of units, and whether professional installation is required. Carbon monoxide is an odorless, colorless gas that is responsible for hundreds of accidental deaths in the US each year. Proper detection is essential in any home with gas appliances, an attached garage, or a fuel-burning heating system. This guide covers typical installation costs and what to look for when choosing a detector.
Contents
⚡ Key Takeaways
- CO detectors come in three main varieties, each with different costs and installation needs:
- Building codes in most states require CO detectors in the following locations:
- New construction typically requires hardwired, interconnected CO detectors — meaning when one alarm triggers, all units in the home sound simultaneously.
Carbon Monoxide Detector Types and Costs
CO detectors come in three main varieties, each with different costs and installation needs:
- Battery-operated CO detectors: $20 – $70 per unit; plug in anywhere, no electrician needed
- Plug-in CO detectors with battery backup: $25 – $80 per unit; requires standard outlet
- Hardwired CO detectors (interconnected): $40 – $100 per unit; $100 – $200 per unit installed by an electrician
- Combination smoke and CO detectors: $50 – $150 per unit; $100 – $250 installed
- Smart CO detectors (app alerts): $100 – $200 per unit; add electrician cost for hardwired models
For most homes, a complete hardwired CO detection system (3–5 units) costs $400 – $1,200 professionally installed.
Where Carbon Monoxide Detectors Are Required
Building codes in most states require CO detectors in the following locations:
- Outside each sleeping area
- On every level of the home
- In the basement if it contains fuel-burning appliances
- In attached garages or adjacent to garage entry points
Homes with gas furnaces, water heaters, dryers, stoves, or fireplaces — or those with attached garages — are at the highest risk and should ensure full code coverage.
Hardwired vs. Battery CO Detectors
New construction typically requires hardwired, interconnected CO detectors — meaning when one alarm triggers, all units in the home sound simultaneously. This provides the fastest warning for sleeping occupants regardless of their location in the home.
For existing homes, battery-operated or plug-in detectors are acceptable replacements in most jurisdictions, though hardwired interconnected systems provide superior protection.
Replacement Costs and Lifespan
CO detectors have a limited lifespan of 5–7 years for electrochemical sensors — the most common type. Replacing all detectors in an average home every 5–7 years costs $100 – $500 for battery or plug-in units, or $400 – $1,200 for hardwired professional replacement.
Carbon monoxide detectors save lives. Our electricians can install hardwired combination smoke/CO detectors — the safest and most reliable option for your home.
When to Hire a Licensed Electrician
Hardwired CO detector installation requires a licensed electrician, particularly when:
- Running new wiring to interconnect multiple units
- Installing combination smoke and CO detectors on existing hardwired circuits
- Adding CO detection to a new home or addition
- A permit is required in your jurisdiction
Frequently Asked Questions
How long do carbon monoxide detectors last?
Most CO detectors have a lifespan of 5–7 years. The sensor degrades over time and becomes less accurate. Always check the manufacture date and replace units that are approaching or past their rated lifespan.
Where is the best place to put a CO detector?
CO is approximately the same density as air, so detectors can be placed at any height. However, manufacturers typically recommend mounting them at knee height or plugging them into low outlets, as CO concentrations build from the floor up in many scenarios. Always follow the manufacturer’s placement guidelines.
Can CO detectors detect gas leaks?
No. Standard CO detectors only detect carbon monoxide, not natural gas or propane. For gas leak detection, you need a separate combustible gas detector or a combination CO and gas alarm.
Do I need a permit to install hardwired CO detectors?
Permit requirements vary by jurisdiction. Replacing like-for-like units typically does not require a permit. Running new wiring or installing a complete system in a new location usually does. Your electrician can advise and handle permit requirements.