CCTV vs Alarm Systems: Do You Need Both?
They solve different problems. An alarm detects that something's happening right now. CCTV tells you what actually happened — and increasingly, with the latest Ubiquiti AI tech, cameras can do a lot of what an alarm used to do on their own.
What Each System Is Actually For
CCTV and alarm systems get bundled together in conversation, but they're built to answer different questions. An alarm system answers: "Is someone here who shouldn't be?" — in real time, using sensors that trigger an immediate response. CCTV answers: "What happened, and who did it?" — through recorded, reviewable footage.
The two used to be genuinely separate systems, installed by different contractors, monitored differently. That line has blurred significantly with modern camera technology — which is exactly what we'll get into below.
The short version: if all you need is evidence and deterrence, CCTV alone often covers it. If you need an immediate response to an intrusion — especially after hours — an alarm still does that job better than a camera alone. Most commercial sites end up wanting both, just not always in the traditional separate-system sense.
What Alarm Systems Do Well
Traditional alarm systems are built around detection and immediate response, not footage.
What CCTV Does Well
Cameras are built around visibility, evidence, and — increasingly — intelligent detection, not just recording.
Feature Comparison
Laid out side by side, it's clearer why most sites end up wanting elements of both.
| Feature | Alarm System | CCTV | UniFi Protect AI |
|---|---|---|---|
| Instant Intrusion Detection | ✔ | — | ✔ |
| Recorded Evidence | — | ✔ | ✔ |
| Remote Monitoring | Optional | ✔ | ✔ |
| Person / Vehicle Detection | — | — | ✔ |
| Facial Recognition | — | — | ✔ |
| Real-Time Mobile Alerts | Optional | Optional | ✔ |
| Monitored Emergency Response | ✔ | — | Optional |
Where the Line Has Blurred: Modern UniFi AI
A traditional alarm and a traditional camera were genuinely separate systems. The latest Ubiquiti UniFi Protect hardware changes that — modern AI-capable cameras now handle detection tasks that used to require a dedicated alarm sensor, while still recording everything.
This is exactly why our core platform is Ubiquiti's UniFi ecosystem: the smart detection features that used to be an alarm system's job, and the recorded evidence that used to be CCTV's job, now run on the same connected platform — not two separate systems bought from two separate installers.
So — Do You Need Both?
For most commercial sites, the honest answer is: you need the functions of both, but modern AI cameras have narrowed how much separate hardware that actually requires.
- High-value or after-hours sites (warehouses, storage facilities) still benefit from a genuine monitored alarm alongside cameras — an immediate, monitored response matters when nobody's there to see an alert.
- Retail and office environments with regular foot traffic often get more value from AI-driven cameras with smart detection and facial recognition than from a traditional alarm, since deterrence and evidence matter more than silent-alarm response.
- Multi-site businesses benefit most from one connected platform handling both detection and evidence, rather than juggling separate alarm and CCTV vendors across every location.
We design security systems around what each specific site actually needs, as part of our business security Sydney service, covering sites across Sydney, the Illawarra, and Newcastle.
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