UK alarm monitoring: the complete guide

What monitoring adds to an alarm

An alarm does two things: it makes a noise, and it knows something happened. An unmonitored alarm only does the first usefully. Monitoring is what turns 'something happened' into 'somebody acted'.

The mechanism is a signalling device wired to the alarm panel, transmitting activations to an Alarm Receiving Centre — a control room staffed around the clock. Operators there hold a response plan for your property and work through it: identify the property and the zone, try to reach you, then escalate.

Everything else in this guide is detail on that one idea. The detail matters because the differences between response levels are large, and because the marketing in this category routinely blurs them.

The four response levels, and what each actually gets you

Almost every buying decision in this category comes down to choosing between these, so it is worth being precise about what each one delivers when the alarm goes off at 3am and the property is empty.

UK alarm response levels compared
Level	What happens on activation	Police attend?	Needs
Bells-only	Siren sounds locally. Nobody is notified.	No	Nothing ongoing
Self-monitored	Alert to your phone. You decide and act.	No — you can report a crime yourself	App and connectivity
Monitored, keyholder response	ARC calls you, then your keyholders or a response company attends.	No, unless a crime is then reported	ARC contract
Monitored, police response	ARC calls you; confirmed activations passed to police.	Yes, for confirmed activations	Approved installer, certificated ARC, URN, maintenance contract

What it costs, and where the hidden costs are

Monitoring is a monthly service fee, and for most UK properties it sits in the low tens of pounds. The indicative ranges published on our costs page will tell you whether a quote is normal.

The costs that catch people out are the ones that are not the monitoring fee. Police URN issue and annual maintenance fees are set by each force and passed to you. A signalling device supply and install is a one-off in the hundreds. Alarm maintenance is a separate annual charge — and it is not optional if you want to keep police response, because the URN depends on it.

Ask for a first-year total, itemised into monitoring, maintenance, hardware and police fees. Two quotes with identical monthly figures routinely differ by a few hundred pounds once those are visible.

How to tell a good provider from a confident one

The single highest-value thing you can do takes about a minute: take the legal entity name and company number from the written quote, and look it up on the NSI or SSAIB register on the inspectorate's own website.

Logos are copied freely and expired certification does not remove them from a website. The register is the only check that means anything. Confirm the certificate is current, and read its scope — intruder alarms, CCTV, keyholding and fire detection are separately certificated, so approval for one is not approval for another.

Then ask which ARC will actually monitor the system. An approved installer may subcontract monitoring to a centre you have not been told about, and that centre's certification is the one that matters for police response. A provider who is straightforward about this is telling you something useful about how they operate.

The two things most likely to go wrong

First: out-of-date keyholder details. A technically perfect monitoring setup produces nothing if the phone numbers on file belong to a neighbour who moved away in 2023. Review the list annually. This is free and it is the highest-value maintenance you will ever do.

Second: false alarms costing you police response. Forces operate a false-alarm allowance over a rolling twelve-month period, and exceeding it suspends the URN. Thresholds are set locally, so the only number that matters is your own force's. Report false alarms honestly to your provider rather than resetting and hoping — the causes are usually cheap to fix once identified, and expensive to ignore.