What does replacing hardwired smoke detectors involve?

Replacing hardwired smoke alarms is a job for a licensed electrician. A typical visit means finding every alarm, checking how old each one is, replacing them with matching alarms that sound together, and testing the whole set. The U.S. Fire Administration is direct about who does it: "Only qualified electricians should install hardwired smoke alarms."^[1]

Why hardwired alarms get replaced

Age is the usual reason. The U.S. Fire Administration says to replace the entire smoke alarm every 10 years, and says hardwired alarms "usually have a backup battery that will need to be replaced once a year."^[1] The agency counts the 10 years from the manufacture date,^[1] so check the date on each alarm.

Other reasons are a unit that chirps or fails its test, an old set made up of mismatched brands that no longer sound together, or a remodel that changes where alarms need to be. Mention any chirping when you book.

What an electrician does on a replacement visit

The exact steps depend on your wiring, but a visit usually covers these things:

• Finding and dating every alarm. Most homes have more than you remember: hallways, bedrooms, the basement and sometimes the attic stair.
• Matching the alarms to each other. The U.S. Fire Administration says to choose interconnected smoke alarms so that when one sounds, they all sound.^[1] Alarms from different makers often do not talk to each other, so an electrician commonly replaces the whole set with one brand.
• Choosing the sensor type. The agency recommends that every home have both ionization and photoelectric smoke alarms, or dual-sensor smoke alarms.^[1]
• Checking placement. The agency recommends alarms in every bedroom, outside each separate sleeping area and on every level of the home.^[1] If one is missing from a level, the electrician can tell you what adding it involves.
• Testing. The whole set is tested together, so you know a push on one button sounds all of them.

The wiring work itself is why this is not a homeowner job.

Permits

Virginia's Uniform Statewide Building Code requires a permit application before installations or alterations involving electric wiring.^[2] The code's list of ordinary repairs that need no permit names replacing switches, receptacles, luminaires and ceiling fans; smoke alarms are not on it.^[2] The same list includes other repair work deemed by the building official to be minor and ordinary,^[2] so whether a like-for-like swap needs a permit is, in practice, the local building official's call.

Phone your county or city building department before the work, or ask the electrician what that locality expects. If the job adds alarms or new wiring, say so when you call, because the permit answer may differ.

What to do while you wait

Do not disable an alarm that is sounding. The U.S. Fire Administration says never to take the battery out of your smoke alarm while cooking.^[1] If a nuisance alarm keeps going off, ask the electrician about relocating that unit instead.

When to call a licensed pro

For the whole job. The Code of Virginia says no individual shall engage in, or offer to engage in, work as a tradesman unless he has been licensed,^[3] and it defines a tradesman as anyone who does work for the general public for compensation in the trades of electrical, plumbing and heating, ventilation and air conditioning.^[4] The Board for Contractors adds that if the work is valued at $1,000 or more, a valid Virginia Contractor's License is required.^[5] Ask the electrician whether your job is above or below that figure.

Check the licence before work starts with how to check if a contractor is licensed in Virginia. Wondering about money first? See what installing hardwired smoke detectors costs in Virginia, and for what the code asks of your house, what smoke alarms Virginia requires.

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To get a quote for your own house, describe the job once and licensed local electricians reply.