Burglar Alarms for Business: Grades, Monitoring, Police Response and What It Really Takes

Grades: the spec language insurers speak

European standard EN 50131 grades intruder systems by the attacker they're designed to resist. Grade 2 — intruders with basic tools and knowledge — is the floor for commercial premises and what most offices, shops and small industrial units need. Grade 3 — intruders who know alarms and come equipped — brings requirements like anti-masking detection and tighter tamper security, and is where insurers put higher-value stock: pharmacies, jewellers, warehouses with desirable goods, licensed premises with significant cash.

The grade isn't a marketing tier — it drives detector choice, signalling, power resilience and installation method, which is why 'what grade?' is the first question a competent installer asks and why a quote that never mentions grading is a quote for a domestic alarm in a commercial building. If your insurance schedule names a grade, that number wins every other preference.

Monitoring: the decision that determines whether anything happens

The URN detail that catches businesses out: police response isn't bought once, it's *kept* — repeated false alarms downgrade and then withdraw it. That makes false-alarm discipline and twice-yearly servicing part of the security spec, not aftercare. And police response requires the installer to be NSI or SSAIB certificated — the certification landscape is its own guide.

What a commercial system actually consists of

• Graded control panel with capacity for zones/areas — so the warehouse can be armed while the office works late, and each keyholder gets their own code (who unset, when, is data you'll want after an incident)
• Detection matched to the space — dual-tech detectors in draughty or temperature-swinging areas, the right PIRs elsewhere, contacts on every external door, shock or curtain protection on vulnerable glazing and roller shutters
• Dual-path signalling for monitored systems — typically IP plus 4G, so cutting the broadband doesn't cut the alarm
• Deliberate arming design — full set, part set, entry routes and timings that match how staff actually open and close; the systems that get abandoned are the ones that fight the opening routine
• Integration where it earns money — alarm events pulling up the CCTV clip, access control logs lining up with unset times: one incident timeline instead of three systems (camera types guide)

What it costs, honestly

A Grade 2 system for a small commercial unit — panel, half a dozen detection points, signalling, commissioning and certification — typically lands in the low-to-mid four figures installed, with monitoring from £150/yr (app) and servicing £90–£180/yr depending on system size; police-response monitoring adds ARC charges on top. Bigger variables are building size, zones and whether shutters/glazing need dedicated protection. The burglar alarm cost guide breaks the numbers down further.

Two cost traps: the cheap unmaintained system that loses its insurance validity the first time a service certificate is missing, and the 'free install' contract whose exit fees fund the freeness. Read the term length before the price.

The takeover option nobody mentions

If your premises already has an alarm from a departed installer or a previous tenant, it can very often be taken over rather than replaced: engineer inspection, re-commissioning, fresh codes and certificates, onto a maintenance schedule — at a fraction of new-install cost. We take over commercial systems constantly, including where the previous company holds the engineer code hostage. Worst case, the survey says the hardware isn't worth adopting — and that's a free finding rather than a surprise.

Related guides

• NSI vs SSAIB — which certification matters?
• What a burglar alarm costs in the UK
• What is a PIR sensor?