Ajax Alarm: The Complete UK Guide From an Installer

Ajax Systems has gone from a Ukrainian startup to Europe's fastest-growing security company in under a decade, and "Ajax alarm" is now the first thing people ask us about when they call about home security. We've installed hundreds of Ajax systems across London, and it's our go-to recommendation for residential security. Here's a no-nonsense guide to what an Ajax alarm offers, what it costs, and whether it's right for your home — written by the people who fit them, not by a comparison site.

How Ajax Works

Ajax is a wireless alarm system built around a central Hub. The Hub connects to your WiFi and has a backup GSM SIM card, so it stays online even if your broadband drops. Sensors communicate with the Hub using Ajax's Jeweller radio protocol — an encrypted, frequency-hopping wireless technology with a range of up to 2,000 metres. Each sensor has a built-in tamper switch and reports its status to the Hub every few seconds.

The Product Range

Ajax offers sensors for every scenario. MotionProtect detects movement with pet immunity up to 20kg. DoorProtect monitors doors and windows. GlassProtect listens for breaking glass. FireProtect detects smoke and rapid temperature rises — the same ecosystem extends into full fire and smoke detection if you want life safety on the one system. LeaksProtect catches water leaks. StreetSiren provides 113dB outdoor deterrent. And the KeyPad lets you arm and disarm with a code or proximity tag — no keys needed.

The App

The Ajax app is genuinely excellent — better than any other alarm app we've used. You can arm and disarm from anywhere, receive instant photo-verified alerts (with the MotionCam), manage users and access rights, check sensor battery levels, and view a complete event log. Multiple users can have different permissions, so you can give the cleaner a code that only works on Tuesdays between 9am and 12pm.

Professional Monitoring

Ajax supports connection to professional Alarm Receiving Centres (ARCs) for 24/7 monitoring. When an alarm triggers, the ARC verifies it using photo evidence from MotionCam sensors before dispatching a response. This dramatically reduces false alarm callouts and ensures genuine emergencies get the fastest response.

Integration with Loxone

This is where it gets interesting. We integrate Ajax with Loxone automation, so security events trigger intelligent responses. Alarm triggered? Loxone floods the house with light and starts recording on all CCTV cameras. You leave the house and arm the alarm? Loxone automatically turns off all lights, drops the heating, and closes the blinds. It's this kind of integration that separates a professional installation from a box on the wall.

What an Ajax Alarm Costs

A typical Ajax alarm installation for a 3-bedroom London house includes: Hub 2 Plus, 4-6 motion sensors, 6-8 door sensors, 1 outdoor siren, 1 indoor siren, 2 keypads, and 2 smoke detectors. Installed and commissioned, that's £1,800-£3,000 depending on the exact specification. Monitoring adds roughly £20-£30/month if you want it — and unlike the subscription brands, it is genuinely optional. There's no subscription required for the app; that's free forever, which over five years is the single biggest difference between Ajax and a Verisure contract or a Ring subscription. If you're weighing those up, our Ajax vs Ring vs Verisure comparison does the five-year maths.

DIY or Professional Installation?

You can buy Ajax kit online and pair it yourself, and for a rented flat with two sensors that's a reasonable weekend job. The catch is everything around the hardware: sensor placement (a motion sensor facing a window or a radiator generates false alarms for years), Grade 2 compliance for insurance, ARC monitoring connection, and integration with cameras or automation. Insurers who discount for an alarm generally require professional installation with a certificate — a self-installed system usually doesn't qualify, whatever the marketing implies. Our installations take 4-6 hours for a typical house, with no drilling through walls and no redecorating.

Is Ajax Right for Your Home?

For the vast majority of London residential properties, yes. It's the best combination of security performance, ease of use, and value we've found. The wireless installation means minimal disruption, the app is excellent, and the integration possibilities with Loxone and Hikvision make it part of a genuinely intelligent security ecosystem. See our Ajax intruder alarm installation service for full specifications and pricing.

Getting an Ajax Alarm Installed in London

We're certified Ajax installers based in Hatch End, covering the whole of Greater London, Hertfordshire, Buckinghamshire and Middlesex — Harrow, Pinner, Northwood, Stanmore, Watford and Barnet are all within twenty minutes of us. The process is simple: a free survey at your property, a fixed itemised quote with every sensor listed, and installation typically completed in a single visit of 4-6 hours. Call 020 8191 2479 or book a free survey and we'll specify exactly what your property needs, with no obligation.