How to Test a Smoke Alarm: Step-by-Step & How Often to Test

A smoke alarm is essentially the ultimate safety net for your family and home.

Smoke is just as deadly as fire.

So, the two minutes an alarm save you are crucial. 

It’s useful to understand:

• What kind of smoke alarm you have.
• Where your smoke alarms should be located.
• How to test and maintain them.

And more!

Understanding your smoke alarm

Smoke detectors rely on physical and electrical detection methods. 

When smoke enters the sensing chamber, the detector identifies changes and sends a signal to sound the alarm.

Today, smoke alarms can be broadly categorised into three main types.

1. Ionization detectors

These respond quickly to fast-flaming fires.

2. Photoelectric detectors

These are better at detecting slow, smoldering fires that produce visible smoke before flames appear. 

They are more common in modern installations.

3. Multi-criteria alarms

These advanced units have sensors to tell the difference between a non-emergency cooking fire and a real emergency.

Locating your smoke alarms

Smoke detection coverage should not be random. The following points are all important:

• Spacing
• Airflow
• Building layout
  

And you should have enough smoke alarms for everyone to hear them. They must be placed:

• On every level of your home.
• Inside and outside every sleeping area.

Note: Always read the manufacturer instructions to know if your alarm belongs on the wall or the ceiling. There are specific rules for vaulted ceilings and manufactured homes.

Getting extra help

If you have questions about where to put an alarm, local fire departments are a great resource.

Additionally, organisations like the Red Cross and local fire departments often provide free smoke alarms to those in need.

Testing your smoke alarms

There are around 37,000 house fires in the UK every year.

Shockingly, 39% of battery-operated smoke alarms fail to sound during a fire. This is often down to batteries being missing, flat, or disconnected.

How often smoke alarms should be tested

You should test your alarms regularly—aim for weekly, or at the very least, every month.

All you need to do is push the button labelled ‘test’ and hold it. If the detector is working, it will sound alongside any linked alarms in the property.

Tip: If you can’t reach the button, use a broom handle!

What to do if your fire alarm keeps beeping

If the alarm sounds loudly and continuously, evacuate immediately and dial 999 (or your local emergency number).

However, if your alarm is just making a constant chirping noise, it means it requires maintenance.

Avoid disconnecting it, as this puts your household at serious risk.

Common culprits for nuisance beeping

The battery needs changing

A constant chirp almost certainly means flat batteries.

It needs cleaning

Alarms collect dust and bugs that cause them to malfunction. Clean your detector every month using the soft brush attachment on your vacuum cleaner.

Loose installation

The battery might not be sitting in the terminal correctly.

Humidity

Steam and environmental humidity can cause false alarms.

End of life

Smoke alarms do not last forever. Different model alarms have different lifespans, which often range from 6 – 10 years.

Check your alarms’ manufacturers’ recommendations to change yours.

If you don’t know (and can’t find out) when your current smoke alarms were installed, err on the side of caution and replace them immediately.

5 easy steps to change a smoke alarm battery

Unless you have an expensive 10-year sealed alarm, you should change your batteries at least once a year.

A great reminder is to do this when the clocks change for daylight savings.

• Remove the cover: It should unclip from the base with a slight twisting motion.
• Take out the old battery from its holder.
• Replace with a new battery: Check the instructions to ensure the correct voltage.
• Put the cover back on.
• Press the ‘Test’ button to ensure the new batteries are working.

Hard-wired smoke alarms

Modern properties often feature mains-powered smoke alarms.

They are highly convenient as they do not require regular primary battery changes.

However, they still contain a backup battery in case of a power cut.

If your hard-wired alarm is continuously beeping, you likely need to change this backup battery (usually every 6 to 12 months).

If it still beeps after a change and a vacuum, press and hold the reset button for 15-20 seconds.

Landlord Compliance

If you rent out property, keeping smoke alarms up to date isn’t just common sense—it’s often the law.

Landlords have strict responsibilities to conduct regular maintenance on smoke, heat, and carbon monoxide alarms. This tis comply with risk and liability legislations, which includes the Landlord Gas Safety Record (LGSR).

Ensure your properties are regularly checked by professionals to keep your tenants safe and avoid legal risks.

Get in touch with Hometree today to organise a LGSR check.

Other alarms

Carbon monoxide alarms are also essential important alarms to install and maintain.

They reduce the risk of a fatal gas leak and help with gas fire safety.