Here is the short answer: if you will reliably answer your phone, modern app-based self-monitoring covers most UK homes without a monthly contract; professional monitoring earns its fee when nobody can respond — holidays, second homes, commercial premises — or when your insurer specifies it. The hardware can be identical. The question is who gets woken up.
"Monitored" is the most misunderstood word in alarms. Some people hear it and picture a control room and a monthly bill; others assume their app notifications already count. Both halves are half right, and the difference decides what actually happens at 3am — so it is worth ten minutes before you spend anything.
We have sold alarms from the Villa Road counter since 1975, under every generation of this technology, and the honest version is below.
1. What "monitored" actually means
Every alarm does the same first job: detect and make noise. The difference is what happens next.
- Audible-only: the siren sounds, and the plan is that someone nearby cares. Increasingly optimistic.
- Self-monitored: the system notifies your phone — and ideally several phones — and you decide what to do.
- Professionally monitored: a staffed alarm receiving centre sees the alarm and acts on an agreed plan: calling keyholders, and on qualifying systems, requesting a police response.
The hardware for the last two is often the same box. You are choosing a response, not a product.
2. Self-monitoring done properly
Self-monitoring fails when it is one phone, on silent, in a cinema. Done properly it is several household members receiving alerts, sensors that tell you what fired and where, and — the real difference-maker — visual verification, so you can see whether it is an intruder or the cat before you act.
The Ajax KIT18 S is the self-monitoring benchmark: a Hub 2 Plus with Superior motion and door sensors, sirens and a keypad, all reporting to the Ajax app where every household member can be a user with their own permissions. Arming, disarming, and who-did-what history all live in the app — which is precisely what makes self-monitoring workable for a family rather than heroic for one person.
Add the Ajax MotionCam Outdoor HighMount and an alert arrives with photos of what triggered it. That single feature converts self-monitoring from "anxiety with notifications" into a system you can act on — because the decision to call the police, a neighbour, or nobody is made looking at the cause.
Trade tip: set the alert chain up as if you will be abroad: at least three users, and a neighbour or relative among them. The night self-monitoring gets tested is the night you are unreachable — configure for that night, not an ordinary Tuesday.
3. Professional monitoring, and what the certificate means
An alarm receiving centre never goes to the cinema. That is the product: staffed response to every activation, an agreed action plan, and — on professionally installed and certificated systems that meet the required standards — the ability to hold a police unique reference number (URN) so that confirmed alarms can request a police response rather than relying on whoever answers a phone.
Two honest caveats. First, monitoring is a contract: an ongoing monthly cost on top of the hardware, and the certificated installation it usually requires. Second, response frameworks are designed around confirmed activations — which is one more reason verification, by photo or by a second detector, matters on any serious system. If your insurer's policy wording names a standard, a grade or a monitoring requirement, that wording decides the matter — read it before buying anything, and see our guide to the British Standard for intruder alarms for what the grades mean.
4. The five-year comparison
Compare like with like over five years, because monitoring is a running cost and hardware is not. A quality self-monitored wireless kit is a one-off spend plus batteries. A professionally monitored system is the installation plus sixty monthly payments — and for a business, a second home, or an insurer requirement, that money is buying something real: a response that does not depend on you. For an occupied family home with several app users and photo verification, it is often buying a duplicate of what you already have.
5. Which suits which property
- Occupied family home: self-monitored, multiple users, photo verification. Spend the monitoring money on an outdoor detector instead.
- Second home or long-empty property: professional monitoring — nobody local is answering the app at 3am.
- Commercial premises: professional monitoring, usually certificated — and check the insurance wording first, because it frequently decides the specification for you.
- Rental with a resident landlord nearby: self-monitored with the landlord in the user list works well; see also our guide to how much a burglar alarm costs for the budget maths.
Monitoring, Summarised
| Route | Ongoing cost | Who responds | Best for |
|---|---|---|---|
| Audible only | None | Whoever hears it | Nobody, honestly — add app monitoring |
| Self-monitored | None by default | You and your user list | Occupied homes with responsive users |
| Professional | Monthly contract | Alarm receiving centre, keyholders, police on qualifying confirmed alarms | Empty properties, businesses, insurer requirements |
Expert Help in the West Midlands
Villa Road, Birmingham, since 1975. Tell us the property, who lives there, and how empty it runs, and we will tell you plainly which side of this line you are on — including when the honest answer is that a monitoring contract would be paying for reassurance you already own. We can demonstrate the Ajax app live at the counter, which settles most of these conversations in about two minutes.
Browse Ajax alarm systems and burglar and intruder alarms. Get in touch for a spec.
Related reading: are Ajax alarms any good, the ultimate guide to burglar alarms, and how much a burglar alarm costs.
Frequently Asked Questions
Do monitored alarms get police response in the UK?
Professionally monitored, certificated systems can hold a police URN, and confirmed activations on those systems can request police attendance. A self-monitored alarm relies on you — or whoever you call — making that judgement, which is why photo verification matters so much on the self-monitored route.
Is self-monitoring good enough for a family home?
Usually, yes — provided several people receive alerts and the system can show you what triggered. Where it stops being enough is when the property regularly sits empty with nobody local on the user list.
Can I start self-monitored and add professional monitoring later?
Often, yes — which is a good reason to buy quality hardware first. The detection layer stays; the response layer is what you upgrade. Check the monitoring provider's hardware and certification requirements before assuming any specific system qualifies.