How Often to Test Every Safety Device in Your Home (2024 Guide)

TL;DR: Test smoke alarms and CO detectors monthly using the test button, replace batteries every 6-12 months, and swap the entire unit every 10 years for smoke alarms and 5-7 years for CO detectors. GFCI and AFCI outlets need a button test monthly. Fire extinguishers need a monthly gauge check and a professional inspection every year, with full replacement or recharge every 5-12 years depending on type.

_Last reviewed: July 2026 · 7 min read_

You probably know you should test your smoke detectors. What most homeowners don't know is that half the safety devices in a typical house get ignored entirely, GFCI outlets, fire extinguishers, and CO detectors among them, until something goes wrong. Here's the exact schedule for every device, not a vague "check them periodically" answer.

Okoniq Property Hub keeps a running log of every safety device test date and battery swap so you're not guessing whether last month actually happened.

How often should you test smoke detectors?

Test every smoke alarm once a month using the test button, and replace the batteries at least once a year, ideally when clocks change in spring or fall. The alarm itself, not just the battery, needs full replacement every 10 years. Most units have a manufacture date stamped on the back; if you can't find it or it's been more than a decade, replace it regardless of how well the test button works.

The National Fire Protection Association reports that three out of five home fire deaths happen in homes with no smoke alarms or non-working ones. A dead battery is the most common failure point, but the sensor itself degrades with age even when the battery is fresh. If your house still has wiring from before 1990, it's worth checking whether you still have knob-and-tube wiring that could complicate hardwired alarm circuits.

How often should you test carbon monoxide detectors?

Test CO detectors monthly, same as smoke alarms, using the test button. Battery-only units need new batteries yearly; plug-in units with battery backup still need that backup battery checked. The sensor inside a CO detector has a shorter working life than a smoke alarm, typically 5 to 7 years, after which the unit should be replaced entirely even if the test button still beeps.

CO poisoning sends more than 100,000 Americans to the emergency room every year according to CDC data, and most cases trace back to fuel-burning appliances, furnaces, water heaters, and attached garages. If your home relies on gas appliances, place a detector on every level and within 15 feet of each bedroom door.

How often should you test GFCI and AFCI outlets?

Test every GFCI and AFCI outlet once a month by pressing the "test" button, which should cut power immediately, then press "reset" to restore it. If the outlet doesn't trip on test or won't reset, it needs replacing right away, not later. These outlets are required in kitchens, bathrooms, garages, and outdoor areas, and they wear out. A GFCI that's tripped hundreds of times over 10-15 years can fail silently, meaning it stops protecting you while still passing power normally.

| Device | Test frequency | Replace every | |---|---|---| | GFCI outlet | Monthly | 10-15 years or on failure | | AFCI breaker | Monthly (breaker panel test button) | 15-25 years or on failure |

If your outlets are still the old ungrounded two-prong style, upgrading to 3-prong safely is worth doing before you even worry about GFCI testing, since you can't add real GFCI protection to some ungrounded circuits without rewiring. And if you're adding several new GFCI circuits or appliances, check whether your panel has enough amperage to handle the load first.

How often should you check fire extinguishers?

Check the pressure gauge monthly and get a professional inspection once a year. The gauge needle should sit in the green zone; if it's dropped into the red, the extinguisher has lost pressure and won't work when you need it. Disposable home extinguishers (the small red ones under $30) typically last 5-12 years and should be replaced, not refilled, once expired. Rechargeable commercial-grade units can be serviced and refilled by a licensed company annually.

Keep at least one extinguisher on every floor and one in the kitchen specifically rated for grease fires (Class B/K). Check the expiration date stamped on the bottom or side, not just the gauge, since some units lose propellant slowly without the needle moving much.

What about water leak and sump pump alarms?

Test water leak detectors and sump pump alarms every 3 months by manually triggering them or lifting the pump's float switch. Battery-powered leak sensors need new batteries yearly, and Wi-Fi-connected models should be checked for a live connection since a dead app notification defeats the purpose. If your basement or crawlspace floods often, pair this with a broader check of moisture sources, since a failing sump alarm won't help if your crawlspace vapor barrier has already failed and moisture is coming from somewhere the alarm can't reach.

FAQ

How do I know if my smoke detector is too old?

Check the manufacture date printed on the back of the unit; if it's been in place for 10 years or more, replace it even if the test button still works, since the sensor degrades with age.

Do hardwired smoke alarms still need battery testing?

Yes. Most hardwired alarms have a battery backup for power outages, and that backup battery needs a monthly test press and an annual replacement just like a standalone unit.

What's the difference between testing and inspecting a fire extinguisher?

Testing is the monthly gauge check you do yourself in under a minute; inspecting is a professional service, usually required annually, that checks the seal, hose, and internal pressure more thoroughly.

Can I test a GFCI outlet with a plug-in tester instead of the button?

A plug-in tester checks wiring polarity and grounding, but it won't confirm the GFCI trip function works, so use the built-in test/reset buttons monthly in addition to any tester.

How many smoke and CO detectors does a typical house need?

Fire safety codes generally call for one smoke alarm per bedroom, one outside each sleeping area, and one per floor, plus a CO detector near every bedroom cluster and any fuel-burning appliance.

This is educational information, not safety or legal advice. Call a licensed electrician or fire safety professional if any device fails testing or you're unsure about your home's coverage.