When people ask me what type of burglar alarm to buy, my first question is always: “How long are you planning to stay, and how much are you willing to disrupt the house?” That usually narrows it down fast. Wired and wireless alarms both do the job — but they suit very different circumstances, budgets and tolerance for installation upheaval. Get it wrong and you’ll either be replastering walls or changing batteries every three months. This guide gives you the full picture so you can decide with confidence.
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Key Takeaways
- Wired alarms are generally more reliable and tamper-resistant — the cable itself cannot be jammed or blocked. They’re the preferred choice for NSI/SSAIB-approved professional installations.
- Wireless alarms are easier to install, less disruptive, and ideal for renters, listed buildings and homes where running cables is impractical.
- Modern wireless systems using frequency-hopping and anti-jamming technology have closed much of the security gap with wired systems.
- Cost over five years can be surprisingly similar once professional installation of a wired system is factored in.
- Both types can be monitored by an Alarm Receiving Centre (ARC) — a requirement for many home insurance discounts.
- See our best home alarm systems guide and our guide to NSI-approved alarms for specific product recommendations.
How Wired Alarms Work
In a wired burglar alarm, every sensor — door contacts, PIR motion detectors, glass-break sensors — is physically connected to the control panel via a cable, typically four-core or six-core alarm cable run through the fabric of the building. The control panel is usually installed in a cupboard or utility room and connected to a bell box on the exterior wall. Power comes from the mains with a battery backup, so the system keeps working even during a power cut. The hardwired connection means there’s no radio signal to jam, no battery in every sensor to replace, and a tamper-evident loop that triggers an alarm if any cable is cut.
Wired alarms are the default choice for professionally installed, NSI Grade 2 or Grade 3 systems used in medium and high-risk properties. Brands like Texecom, Pyronix, Scantronic and Honeywell Galaxy dominate the professional market. These aren’t systems you’d typically install yourself — the installation involves drilling, routing cable through walls, lofts and underfloors, and programming the panel, which usually requires specialist knowledge. A professional wired installation from an NSI or SSAIB-approved installer typically costs £800–£2,000 depending on the size of the property and number of sensors. See the NSI installer finder to locate approved companies near you.
How Wireless Alarms Work
Wireless alarms replace those cables with radio-frequency communication between each sensor and the control panel. Each sensor contains its own battery — typically lasting two to five years depending on the technology — and transmits a signal to the hub when triggered. The hub communicates with a monitoring centre or your smartphone via GSM cellular, broadband, or both. Installation is dramatically simpler: sensors are screwed or stuck to surfaces, the hub is plugged in or battery-powered, and setup is done through an app.
The major DIY brands in the UK market include Yale Smart Home, Ring Alarm, Ajax Systems, and Risco. At the professional end, Ajax and Pyronix offer wireless systems certified to EN 50131 Grade 2, making them suitable for monitored installations that satisfy insurance requirements. Costs range from £150–£400 for a DIY kit covering a three-bedroom home, up to £600–£1,200 for a professionally installed wireless system. The Which? guide on home alarm systems provides useful independent testing data.
Head-to-Head Comparison
| Factor | Wired Alarm | Wireless Alarm |
|---|---|---|
| Reliability | Excellent — no battery failure, no RF interference | Very good with modern systems; older RF tech more vulnerable |
| Tamper resistance | Excellent — cable cut triggers alarm; hardwired tamper loops | Good with anti-jamming; grade-certified systems use frequency hopping |
| Installation disruption | High — cable runs, drilling, possible replastering | Low — sensors surface-mounted, no cable runs required |
| Installation cost (professional) | £800–£2,000 | £400–£1,200 (or DIY from £150) |
| Ongoing maintenance | Annual service recommended; low ongoing cost | Annual service + periodic sensor battery replacement (£5–£20 per sensor) |
| Expandability | Harder to add sensors post-install (more cable runs) | Easy — just pair new sensors to the hub |
| Suitability for renters | Poor — requires landlord permission for cable work | Excellent — fully removable, no structural work |
| Suitability for listed buildings | Poor — may require Listed Building Consent for cable work | Good — no building fabric penetration required |
| NSI/SSAIB certification available | Yes — Grade 2 and Grade 3 | Yes — Grade 2 with approved systems (Ajax, Pyronix) |
| Insurance recognition | Full recognition with approved installer | Full recognition with grade-certified, monitored system |
The Jamming Question: Is Wireless Really Vulnerable?
The most common objection to wireless alarms — particularly from people who’ve done their research — is radio frequency jamming. In theory, a burglar with a jamming device operating in the 433 MHz or 868 MHz frequency band could block the signal between sensors and the hub, preventing the alarm from triggering. This is a legitimate concern and it’s why older, cheaper wireless systems should be treated with caution.
However, modern professional-grade wireless systems — Ajax, Pyronix Enforcer, Risco LightSYS+ — use frequency hopping spread spectrum (FHSS) technology. The system constantly switches frequency, making sustained jamming extremely difficult. Grade 2-certified systems also monitor signal quality continuously: if they detect a sustained disruption consistent with jamming, the panel raises a tamper alarm. That said, a determined, technically sophisticated attacker remains a theoretical threat. For Grade 3 or Grade 4 installations — high-value properties or commercial premises — hardwired is still the preferred professional standard. For the typical UK semi or terrace, a grade-certified wireless system with monitoring is robust and practical. The Met Police’s home security guidance notes that visible, monitored alarms are the single most effective deterrent for opportunist burglars, regardless of wired or wireless technology.
Professional Installation vs DIY
For wired alarms, professional installation is essentially mandatory unless you’re a skilled electrician or security engineer — the complexity of routing cable and programming the panel puts it beyond most DIY capability. For wireless alarms, the DIY vs professional question is more nuanced. A self-installed Yale Smart Home Alarm or Ring Alarm works perfectly well as a deterrent and will alert you and your neighbours. But it won’t satisfy your home insurer’s requirement for a monitored, grade-certified alarm. Check your policy carefully: many insurers offering a discount for an alarm specify that it must be installed and maintained by an NSI or SSAIB-approved company, and grade-certified to EN 50131.
If your policy requires NSI or SSAIB approval, you need either a professionally installed wired system or a professionally installed wireless system from an approved installer. For a full breakdown of what approval means and why it matters for insurance, read our detailed post on NSI-approved alarms. If you’re weighing up different alarm types and brands, our guide to burglar alarm types covers Grade 1 through Grade 4 systems in plain language.
Which Should You Choose?
Choose a wired alarm if: you own your home outright, you’re planning a significant renovation (cable runs are far cheaper during building works), you want the maximum possible tamper resistance, your insurer specifies a Grade 3 system, or you have a high-value property that justifies the investment.
Choose a wireless alarm if: you rent, you live in a listed building, you want to install it yourself, you need a system up quickly without disruption, you’re likely to move within five years and want to take the system with you, or you have a modern property where a grade-certified wireless system will fully satisfy your insurer.
In practice, the majority of UK homeowners in standard properties — terraced, semi or detached houses built after 1980 — will be well served by a grade-certified wireless system professionally installed by an approved company. The technology has caught up. The disruption and cost differential between wired and wireless no longer justifies wired for most domestic situations. But if you’re in any doubt about what your insurer requires, call them before you buy — it’s a five-minute conversation that could save you significant money and aggravation.
Final Thoughts
There’s no universally correct answer to wired versus wireless — only the right answer for your specific home, budget and circumstances. What matters most is that you have a working, monitored alarm system that your insurer recognises. A grade-certified wireless alarm professionally installed is substantially better than a wired alarm you install yourself without proper configuration. Start with your insurance policy requirements, check the NSI website for approved local installers, get two or three quotes specifying both wired and wireless options, and make the decision from there. Your home is the biggest investment you own — the alarm system protecting it is worth doing properly.