Guide · 5 min read
Wireless vs wired alarm systems: which should you choose?
Wireless has overtaken wired for most homes, but not all. Here is how to tell which one your property needs.
Last updated 14 August 2026
The short version
For most occupied homes, wireless is now the better choice. For new builds, extensions and larger commercial premises where cable can be run during construction, wired still wins.
The old objections to wireless: short battery life, unreliable signalling, easy to jam: were fair fifteen years ago. Modern professional systems have largely resolved them.
Where wireless wins
The decisive advantage is disruption. A wireless system goes into an occupied house in a day without lifting carpets, chasing walls or drilling through solid masonry. In a period property with thick walls and no useful voids, that difference is enormous.
Battery life on professional systems is now measured in years, and the panel monitors every device. If a battery is low or a sensor stops responding, you are told rather than left with a silent gap.
- Installed in a day with minimal mess
- Devices can be moved or added later without new cabling
- Encrypted signalling with tamper and supervision alerts
- Battery life typically measured in years, not months
- Ideal for period, listed and solid-walled properties
Where wired still wins
If walls are already open: a new build, an extension, a full refurbishment: cabling costs very little extra and removes batteries from the equation entirely.
Larger commercial systems with many detection points also tend to favour wired, both for reliability at scale and because cable routes in commercial buildings are usually straightforward.
- No batteries to replace, ever
- Cost-effective when walls are already open
- Preferred for large commercial installations
- No reliance on radio signalling at all
What matters more than the choice
Detector positioning matters more than the technology. An alarm that false-triggers because a motion sensor faces a sunlit window or a radiator will get switched off, and an alarm that is switched off protects nothing.
The same goes for pets. Pet-tolerant detectors work well, but only if they are positioned and configured around your actual animals.
Frequently asked
- Can a wireless alarm be jammed?
- Professional systems monitor for interference and raise an alarm if signalling is disrupted, so jamming triggers the alarm rather than silencing it. Cheap consumer kit is more vulnerable.
- How often do wireless batteries need replacing?
- Typically every few years, depending on the device. The panel tells you well in advance rather than letting a sensor go dark.
- Can I add to a wireless system later?
- Yes. That is one of its main advantages. Extra detectors can be added without new cabling.
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