How Much Does a Burglar Alarm Cost in the UK?

A professionally installed wireless burglar alarm for a typical three-bed UK house costs from around £595 fitted (bell-only with app control). Monitored home systems cost £800–£1,500 plus £150–£400 per year for monitoring. Commercial systems cost £800–£2,500 for Grade 2 and £2,500–£5,000+ for Grade 3, depending on building size, number of detectors, and signalling type.

A bell-only alarm sounds the siren and sends app notifications, but nobody is formally responsible for responding — you rely on yourself or neighbours. A monitored alarm signals a 24/7 alarm receiving centre (ARC), which contacts your keyholders or requests police response. Bell-only has no ongoing fees; monitoring costs £150–£600 per year depending on the response level.

Police response requires a Unique Reference Number (URN), which is only available for systems installed and maintained by an NSI or SSAIB certificated company with confirmed activation technology and dual-path signalling. Expect £300–£600+ per year covering ARC monitoring, dual-path signalling, and the URN administration fee, plus mandatory annual maintenance.

DIY smart alarms are not graded to EN 50131, so most commercial insurers will not accept them where the policy specifies a Grade 2 or Grade 3 'professionally installed and maintained' system — and they cannot qualify for police response URNs. For homes with no insurer requirement they can be adequate, but for business premises a graded, certificated system is usually the only option that satisfies the policy.

Many insurers offer discounts of 2–15% for professionally installed and maintained alarms, with the bigger discounts for monitored systems with police response. More importantly, some commercial policies require a specific alarm grade as a condition of cover — fitting the wrong system can invalidate a claim. Always check your policy wording before choosing a grade.

A wireless home alarm is typically installed and commissioned in half a day to one day. A wired system in an occupied house takes 1–2 days because of cable runs. Commercial Grade 2 installations usually take 1–3 days; larger Grade 3 systems with dual-path signalling and multiple zones can take a week or more.

Bell-only systems have no compulsory ongoing costs, though an annual service (£75–£150) is recommended and keeps the warranty valid. Monitored systems cost £150–£400 per year for keyholder response or £300–£600+ for police response, which includes the maintenance contract. Wireless device batteries need replacing roughly every 2–4 years.

The most common causes are low batteries in wireless detectors, spiders or insects on PIR lenses, pets triggering motion sensors, draughts moving curtains or hanging decorations, loose door contacts, and ageing detectors past their service life. A service visit can usually identify and fix the cause — repeated false alarms will also jeopardise a police response URN, which is withdrawn after too many false activations.

It is not a legal requirement, but it is required for police response (URN) and by many insurers, who specify an alarm 'installed and maintained by an NSI or SSAIB approved company'. Certification also means the installer is independently audited against EN 50131 and PD 6662, and you receive a certificate of compliance your insurer will recognise.

For most existing homes and small businesses, wireless is the better choice: installation is quicker, there is no redecoration, and modern systems are reliable with supervised signals and tamper detection. Wired systems still make sense for new builds, major refurbishments, and large commercial premises where device counts are high and cabling can be run during fit-out.

Check your policy schedule — it will state something like 'an intruder alarm to EN 50131 Grade 2, installed and maintained by an NSI or SSAIB approved company, with [keyholder/police] response'. Standard homes and low-risk businesses are usually Grade 2; premises with high-value stock (jewellery, pharmaceuticals, electronics, warehouses) are commonly Grade 3. If you are unsure, ask your broker before getting quotes.

Home Office research consistently shows burglars avoid properties with visible alarm systems, and insurers reflect that in premiums and policy conditions. For businesses, an alarm is frequently a condition of insurance rather than a choice. Against a typical £595–£2,500 installation cost, the deterrent value, insurance compliance, and out-of-hours protection make a professionally installed system one of the most cost-effective security measures available.