Choosing between wired and wireless alarm systems

Why the wiring question comes first

Most people begin their alarm research thinking about apps, keypads and fobs. The decision that actually shapes everything else — cost, disruption, and how easily you can expand later — is how your sensors talk to the control panel. Get that right and the rest falls into place. Get it wrong and you will be living with the compromise for years, so it is worth understanding what each approach is genuinely good at before you compare features.

Wired systems: dependable and discreet, but disruptive to fit

A traditional wired alarm runs a physical cable from every detector back to a central control panel, usually tucked away in a cupboard, loft or under the stairs. Each sensor draws its power from the panel and communicates over that cable, which is why wired systems have a reputation for reliability. There is no radio signal to lose, no battery to flatten at an awkward moment, and nothing for a neighbour's new router to interfere with.

They are discreet too. Door contacts can be recessed into the frame, and PIRs sit flush against the wall rather than perched on a bracket. That matters in a hallway or a living room where you would rather not advertise your security arrangements.

The trade-off is the installation. Cables have to be routed through floors, ceilings and walls, which means lifting boards, chasing plaster and making good afterwards. In a furnished home — and especially in a period property with lath and plaster or a listed interior — that is a job for a professional, and it is messy even when done neatly. Expect to pay considerably more in labour than for the equipment itself.

Wired makes most sense when:

• You are renovating, extending or rewiring anyway, so disruption is happening regardless.
• You plan to stay in the property for a decade or more.
• Your home has generous loft, basement or service voids to run cable through.
• You want the longest service life with the least ongoing fiddling.

Wireless systems: quick to fit, simple to extend

A wireless system gives each detector its own battery and radio transmitter, communicating with the panel over a licence-exempt frequency. Installation can be done in an afternoon, with no chasing and no making good. That makes it the obvious choice for a rented flat (with your landlord's written consent), a listed building, a solid-walled Victorian terrace, or anywhere you might move on from in a few years.

Expansion is the other big advantage. Adding a sensor to a shed, a second keypad by the back door or a camera over the drive is usually a case of pairing a device rather than running a new cable. If you start with a basic kit and decide a year later that you want the garage covered, you simply add to it.

There are compromises. Batteries need replacing every two to five years, and cheap kits sometimes use awkward non-standard cells. Thick stone walls, foil-backed insulation and metal studwork can all weaken the signal, so you may need a repeater. Radio interference is possible, and a determined intruder could in theory attempt to jam the signal — better panels detect jamming and alert you, and modern two-way encrypted systems are far harder to defeat than older one-way models. If your insurer has specific requirements, check them before you buy rather than after.

Hybrid systems and awkward layouts

You are not obliged to choose one or the other. Most current panels accept both wired and wireless devices, which lets you play to the strengths of each. A sensible approach is to hard-wire the things that are easiest to reach and hardest to replace — door contacts, the hall PIR, the panel's own power supply — and use wireless for the garage, loft, garden room and anywhere a cable run would be genuinely painful.

Think about your layout honestly. Where are the likely entry points? Do you have a side gate, a flat-roof extension, a back door hidden from the street? Where would you actually walk if you got up at 3am? A modest system covering the right three or four places will serve you far better than a sprawling one covering the wrong ones.

What it costs, up front and over time

Wireless hardware generally costs more per sensor, but far less in labour. Wired hardware is cheaper to buy and more expensive to install. Over a long stay in the same property, the two often even out.

Do not overlook running costs and signalling. If you want alerts on your phone or monitoring, the system needs a route to the outside world — typically your broadband or a mobile network connection. Dual-path signalling, which uses both, is the more resilient option because it keeps working if one is cut. Battery replacement is a real, if modest, ongoing cost on wireless setups, and you should also budget for an annual service if you want the system to stay reliable and your warranty intact.

Questions to ask before you commit

• How many zones do I need now, and how many spare does the panel support?
• What happens during a power cut? Most panels have battery backup, typically several hours — ask how long.
• Will I be told if the panel is tampered with, or if the signal is being interfered with?
• Can I add sensors myself later, or does that need an engineer?
• Does the system meet the relevant British Standard for my needs, and is the installer certified?
• Who services it, how often, and what does that cost?

Whichever route you take, make sure you actually use the thing. Set it every night, use the part-set or night mode so downstairs is armed while you sleep, keep the landing and hall covered, and test the system monthly. A well-chosen alarm that sits unset is worth far less than a modest one you trust and switch on without thinking.