The best wireless home alarm systems of 2026, with no subscription needed

Yes, if someone can react to phone alerts. A self-monitored alarm alerts you and scares intruders off with its siren, but no one checks the alert on your behalf: you call 911 if you see evidence of a break-in. With professional monitoring, a monitoring centre checks each alarm and contacts emergency services when needed, for a monthly fee. Some DIY systems let you add professional monitoring later, month by month.

Sometimes, but insurers vary: some give a small discount for any working alarm, while policies with high coverage limits for contents may require a monitored system installed by an approved company. Ask before you buy. If your policy contains an alarm condition, you must arm the alarm whenever the home is empty, or a burglary claim could be reduced or refused. Keep the app's arming history, as it can show the alarm was set.

Start with a contact sensor on every exterior door and a motion sensor covering each main route through the main floor. As an example, a three-bedroom semi-detached house might use contact sensors on the front, back and patio doors, motion sensors in the front hall and living room, and an outdoor siren. Add sensors to accessible main-floor and basement windows, and choose pet-friendly PIR sensors if you have a dog or cat.

It can, if your alarm or its monitoring still relies on a traditional landline dialer: once your phone line moves to internet (VoIP) service, an older dialer may no longer get through reliably. Modern self-monitored alarms that use Wi-Fi or a 4G SIM backup aren't affected. If your system calls a monitoring centre or your phone over a landline, ask your provider to move it to a cellular or dual-path connection, such as internet plus 4G, before you change your phone service.

False alarms usually come from a badly placed motion sensor, a pet, or a low battery in one of the sensors. Keep PIR sensors away from heating vents, heaters, sunny windows and moving curtains, use pet-friendly models and check the app's event log to see which sensor triggered. Replace low batteries promptly. On a monitored system, repeated false alarms waste the time of the monitoring centre and emergency services, so fix the cause quickly.