St. Louis Smoke Detector Installation and Fire Alarm Service

Every Alarm Has an Expiration Date

Smoke alarms wear out on a schedule. NFPA guidance is to replace every alarm 10 years from its manufacture date, including hardwired units, because the sensing element loses accuracy long before the unit stops powering up. A test button confirms the horn works. It says nothing about whether the sensor still reads smoke.

What our electricians handle is the wiring behind the alarm: hardwired units fed from a lighting circuit, detection added to floors that never had it, and every unit put on the same clock so they expire together.

One Alarm Sounding Should Wake the Whole House

A single alarm in a hallway protects the hallway. If a fire starts in a finished basement two floors down, anyone asleep upstairs might hear nothing until smoke reaches them. Interconnection changes that. When one unit senses smoke, every unit in the house sounds with it.

Hardwired interconnection runs a three-conductor cable between alarms so the trip signal travels on its own traveler wire, with battery backup carrying each unit through an outage. In a brick house built between 1880 and 1940, with plaster walls and no attic access over the first floor, pulling that cable can mean opening finished ceilings. That's when we'll price a wireless, interconnected set instead, which pairs the units via radio and gives you the same all-sound response without the plasterwork.

Detection That Reaches You When the House Is Empty

An alarm sounding in an empty house helps nobody unless a neighbor is outside to hear it. Smart alarms push a notification to your phone and name the room it came from, which turns a fire into a phone call instead of something you find when you pull into the driveway.

Pair that with combination smoke and carbon monoxide alarms, because gas furnaces and water heaters in a closed basement create a hazard no smoke sensor watches for. We install these alongside the rest of a connected home setup, and we schedule around naps, pets, and anyone who does better without a stranger on a ladder in the hallway at an unpredictable hour.

Frequently Asked Questions About Smoke Detectors

The following come up while we're on the ladder. Anything not covered, our phone line is staffed at any hour.

Where Should Smoke Alarms Go in a Two-Story House?

You need an alarm inside every bedroom, one outside each sleeping area, and one on every level, including the basement. Keep them at least ten feet from a stove, since cooking smoke sets off a well-placed alarm as readily as a fire does.

How Long Do Hardwired Smoke Detectors Last?

Ten years from the manufacture date, the same as a battery unit. Being wired to a circuit keeps the horn powered. It doesn't keep the sensor accurate.

Can I Replace a Hardwired Alarm with a Battery-Powered One?

Not where the hardwired system was required when the house was built or remodeled. Capping the wire and hanging a battery unit drops the interconnection, so the rest of the alarms stay quiet while that one sounds.

Do Smoke Alarms and Fire Alarms Mean the Same Thing?

In a house, the terms get used interchangeably for the same device. In a commercial building, a fire alarm system means a panel, initiating devices, and monitoring, which is a different scope of work than residential detection.