Safety & inspections

Smoke and carbon monoxide detector installation

Hardwired smoke alarms should be replaced about every 10 years, and interconnected so one alarm sounds them all. Homes with gas appliances or an attached garage also need carbon monoxide alarms. An electrician installs new hardwired alarms and adds interconnection.

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About smoke & co detector installation

Every smoke alarm has a manufacture date on the back. Past 10 years, the sensor is no longer reliable, even if the test button still beeps.

Many states require CO alarms when a home is sold or renovated. Combination smoke/CO units reduce the number of devices on the ceiling.

Smoke & CO Detector Installation at a glance: Safety & inspections
Who does the work: An independent licensed electrician
Urgent calls: Usually scheduled
Typical first step: Check existing alarms

Signs you need this

Alarms older than 10 years
Chirping that continues after a battery change
Alarms that do not sound together
Gas appliances without CO alarms

What the electrician does

1
Check existing alarms
Ages, locations and wiring are checked.
2
Replace and interconnect
New alarms are installed in each bedroom, outside sleeping areas and on each level.
3
Test
Every alarm is tested together.

What affects the cost

Electricians set their own prices. These are the factors that move a quote up or down, so you can compare like for like.

Number of alarms
Hardwired versus wireless interconnect
New wiring needed
Combination smoke/CO units

What you can do safely, and when to stop

Safe to do

✓ Test alarms monthly
✓ Replace batteries yearly in battery units

Stop and call

✕ Do not disconnect a chirping hardwired alarm and leave it off

Key terms

Interconnected alarms: Smoke alarms linked so that all sound when any one detects smoke.
Photoelectric sensor: Detects smoke by light scattering; responds well to smoldering fires.
Hardwired alarm: An alarm powered by the home's wiring, with a battery backup.

Smoke & CO Detector Installation FAQ

How often should smoke detectors be replaced?

About every 10 years from the manufacture date on the back of the alarm.

Where should smoke alarms be installed?

NFPA guidance calls for smoke alarms inside every bedroom, outside each sleeping area, and on every level of the home, including the basement. Local codes adopt these rules with some variation.

How often should smoke alarms be replaced?

Every 10 years, according to NFPA. The manufacture date is printed on the back of the alarm.

What are interconnected smoke alarms?

Alarms linked by wire or wireless signal so that when one sounds, they all sound. New homes are required to have them, and they help people hear an alarm anywhere in the house.

Why is my smoke alarm chirping?

Usually a low battery, or an alarm reaching its end of life. Hardwired alarms have backup batteries that also need replacing.

Do I need carbon monoxide alarms?

If the home has fuel-burning appliances, a fireplace or an attached garage, CO alarms are recommended outside sleeping areas and on each level, and many states require them.

Can hardwired smoke alarms be replaced with any brand?

Not always. Interconnected alarms usually need to be the same brand and compatible model, and different brands use different wiring plugs.

Ionization or photoelectric: which is better?

Ionization alarms respond faster to flaming fires and photoelectric alarms to smoldering fires. Many safety organizations recommend having both or using dual-sensor alarms.

Where electricians offer this

Local guides to smoke & co detector installation, with permit offices, housing and utility notes for each city:

By state:

Available through our network in 48 states and DC. Metro guides:

Birmingham, AL Mobile, AL Montgomery, AL Huntsville, AL Phoenix, AZ Tucson, AZ Mesa, AZ Little Rock, AR Fayetteville, AR Los Angeles, CA San Diego, CA Sacramento, CA San Francisco, CA San Jose, CA Fresno, CA Riverside, CA Bakersfield, CA Long Beach, CA Oakland, CA Stockton, CA Anaheim, CA Modesto, CA Pasadena, CA Santa Rosa, CA Denver, CO Colorado Springs, CO Aurora, CO Fort Collins, CO Pueblo, CO Boulder, CO Hartford, CT New Haven, CT Bridgeport, CT Waterbury, CT Stamford, CT Wilmington, DE Dover, DE Washington, DC Miami, FL Tampa, FL Orlando, FL Jacksonville, FL Pensacola, FL Fort Lauderdale, FL Saint Petersburg, FL Kissimmee, FL Lakeland, FL Gainesville, FL Tallahassee, FL West Palm Beach, FL Fort Myers, FL Sarasota, FL Daytona Beach, FL Bradenton, FL Fort Pierce, FL Naples, FL Atlanta, GA Augusta, GA Savannah, GA Athens, GA Marietta, GA Kahului, HI Boise, ID Nampa, ID Chicago, IL Peoria, IL Rockford, IL Indianapolis, IN Fort Wayne, IN South Bend, IN Des Moines, IA Davenport, IA Cedar Rapids, IA Wichita, KS Overland Park, KS Louisville, KY Lexington, KY New Orleans, LA Baton Rouge, LA Shreveport, LA Metairie, LA Portland, ME Baltimore, MD Silver Spring, MD Annapolis, MD Boston, MA Springfield, MA Worcester, MA Detroit, MI Grand Rapids, MI Saginaw, MI Lansing, MI Ann Arbor, MI Minneapolis, MN Saint Paul, MN Gulfport, MS Jackson, MS Hattiesburg, MS Kansas City, MO Saint Louis, MO Columbia, MO Missoula, MT Omaha, NE Lincoln, NE Las Vegas, NV Reno, NV Henderson, NV Manchester, NH Nashua, NH Trenton, NJ Newark, NJ Jersey City, NJ Paterson, NJ Albuquerque, NM New York, NY Albany, NY Syracuse, NY Rochester, NY Buffalo, NY Schenectady, NY Charlotte, NC Raleigh, NC Greensboro, NC Durham, NC Winston-Salem, NC Wilmington, NC Columbus, OH Cleveland, OH Cincinnati, OH Dayton, OH Toledo, OH Akron, OH Oklahoma City, OK Tulsa, OK Norman, OK Portland, OR Salem, OR Eugene, OR Beaverton, OR Philadelphia, PA Pittsburgh, PA Allentown, PA Scranton, PA Harrisburg, PA Lancaster, PA Reading, PA Wilkes Barre, PA Providence, RI Warwick, RI Charleston, SC Columbia, SC Greenville, SC Nashville, TN Knoxville, TN Chattanooga, TN Memphis, TN Murfreesboro, TN Houston, TX Dallas, TX San Antonio, TX Austin, TX Fort Worth, TX El Paso, TX Denton, TX Corpus Christi, TX Waco, TX Plano, TX Tyler, TX Salt Lake City, UT Ogden, UT Virginia Beach, VA Arlington, VA Richmond, VA Norfolk, VA Alexandria, VA Chesapeake, VA Newport News, VA Hampton, VA Seattle, WA Spokane, WA Tacoma, WA Vancouver, WA Olympia, WA Everett, WA Huntington, WV Charleston, WV Milwaukee, WI Madison, WI Cheyenne, WY Casper, WY All locations →

Specialized smoke & co detector installation services

Specific jobs within smoke & co detector installation, each with its own guide to signs, process and cost factors.

Carbon Monoxide Detector Installation

Carbon monoxide detector installation adds hardwired, interconnected CO alarms near sleeping areas and on each level, so a leak from a furnace, water heater, generator or attached garage sets off every alarm in the home..

Learn more →

Related services

Guides

When to Replace Hardwired Smoke Alarms →

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