Ajax alarm vs Bunnings DIY kit: what the price gap actually buys you

Short answer: a Bunnings DIY alarm kit is $200–$600. A professionally-installed Ajax wireless alarm system is $2,800–$4,500. The price gap looks brutal until you realise you’re comparing a doorbell that screams to a security system that catches and reports break-ins. Below is the line-by-line breakdown of where the $2,200+ difference actually goes — and why most Brisbane homeowners regret the DIY route within 18 months.

What you get for $300 at Bunnings

A typical entry-level DIY alarm kit — the ones at Bunnings, Officeworks, or Kogan — bundles roughly:

• 1 control panel with built-in keypad
• 2 or 3 PIR motion sensors (indoor only)
• 2 or 3 door/window contact sensors
• 1 indoor siren
• A free app (sometimes) with basic push notifications

It’s a real product. It works on the kitchen bench. The problem is that everything that makes a security system actually USEFUL is either missing, downgraded, or designed to fail at the worst possible moment.

What you get for $3,500 from a Mr Secured Ajax install

The same money buys an entirely different category of product:

• Ajax Hub 2 Plus: the brain. Ethernet + Wi-Fi + dual-SIM 4G failover. If your NBN goes down, it falls over to mobile data automatically. 16-hour battery backup. Encrypted Jeweller radio that can’t be jammed by a $30 device.
• Ajax KeyPad TouchScreen: wall-mounted arm/disarm with RFID tag, code, or one-touch panic
• Ajax MotionProtect Outdoor (×2–4): dual-tech pet-immune sensors that catch intruders BEFORE they reach the door. Designed for Australian conditions — possums, breezes, storm rain don’t trip them.
• Ajax MotionCam (×1–2): photo verification on every alarm. Five frames in nine seconds, encrypted to your phone. Lets you confirm a real intruder vs the cleaner before responding.
• Ajax DoorProtect (×3–6): discreet wireless contact sensors on every external door
• Ajax GlassProtect (×1–2): listens for the dual-frequency signature of breaking glass, no drilling
• Indoor + outdoor sirens with Brisbane storm-rated weatherproofing
• Professional install: Mr Secured walks the property, designs the sensor placement, configures the Ajax app, sets up family member access, and trains you on the system

The line-by-line price gap

The price gap is roughly $2,000–$3,500. What you’re actually buying is the difference between something that beeps and something that catches and reports a real break-in.

The DIY failure modes Brisbane homeowners hit most often

Mr Secured replaces 20–30 failed DIY systems per year. The common failure modes:

1. Sensors stop talking to the hub after 18–24 months. Cheap sensors drift off-frequency or run their batteries down faster than expected. Owner stops using the system because the false alarms wake the household.
2. Storm season takes the system offline. Power flicker resets the hub. NBN drops for 2 hours. The hub doesn’t reconnect on its own. Owner finds out 3 weeks later when they try to arm before a holiday.
3. The cleaner trips the alarm. Then the dog walker. Then the kids. Because the system can’t distinguish humans from movement, the family disarms it permanently after a fortnight of false alerts.
4. The break-in actually happens. Police arrive, ask for footage. Owner has none — the DIY kit doesn’t have cameras, the recorded events don’t have photos, the app history is gone.
5. The brand discontinues the line. The DIY app gets pushed to the App Store graveyard 3 years in. Owner has a $400 brick on the wall.

Every one of those failure modes is what Ajax’s design specifically protects against — encrypted radio, dual-tech sensors, photo verification, mesh network with redundant paths to the cloud, 7-year battery life, and a global product backbone that won’t disappear.

Why doesn’t Bunnings sell Ajax?

Because Ajax doesn’t allow consumer-direct sales. Ajax sells exclusively through certified installers — Mr Secured is one of the certified Ajax installers in Brisbane. The company’s logic is simple: a self-installed Ajax system without a proper site survey, hub placement, sensor calibration, and outdoor zone tuning would underperform and damage the brand. Selling through certified installers means every Ajax system in the wild is professionally configured.

The “I’ll just install it myself” trap

You absolutely can install an Ajax-grade system yourself if you’re an electrician with security-system experience. For everyone else, here’s the maths:

• Buying Ajax components retail (where you can find them) is roughly $2,400 for the same kit Mr Secured installs
• A botched install — wrong sensor placement, hub in the wrong spot, no outdoor zone tuning — gives you 60% of the system’s actual capability
• The first false-alarm cycle of “kids set it off, dog set it off, possum set it off” trains the family to not use it
• Within 18 months you’ve spent $2,400 on hardware and disabled it from the app

Versus paying $3,500 for the same kit installed properly with 12 months of installer support: the install is what makes the system actually work.

What about professional monitoring?

Both Ajax (installed by Mr Secured) and DIY kits can be hooked into a 24/7 professional monitoring station. The cost is around $25–$35/month through an Australian station. It’s optional, not bundled.

The honest answer: most Mr Secured customers don’t pay for monitoring. The Ajax app pushes alarms straight to your phone within 2 seconds, faster than a monitoring station can call you back. Monitoring is worth paying for if:

• You travel internationally and won’t see your phone for 12+ hours
• Your insurance policy requires it (some commercial policies do)
• You want a third party to dispatch police on your behalf

For a regular Brisbane home owner who keeps their phone on them, the self-monitored Ajax system is cheaper, faster, and more reliable than monitored DIY kits.

Common questions

Is a $300 DIY kit better than no alarm at all?

Marginally. It’s still a deterrent — burglars walking past a house with a visible siren box think twice. But it doesn’t catch break-ins, doesn’t give you photo verification, and doesn’t survive a year of Brisbane summers. Mr Secured’s view: if you’re going to spend money, spend it once on a system that lasts 7 years rather than three times on systems that don’t last 18 months.

Can I start with an Ajax system and add to it later?

Yes — Ajax handles 100+ devices on a single hub. Most customers start with a 4-sensor kit and add MotionCam outdoor or perimeter sensors a year later. No system rebuild needed; the hub already has the capacity.

Does Ajax need a monthly subscription?

No. Mr Secured installs Ajax as a self-monitored system — alarms go straight to your phone via the Ajax app at $0/month. Optional 24/7 professional monitoring through an Australian station is $25–$35/month if you want it, but it’s add-on, not bundled.

What if I move house?

Ajax is wireless, which means the install runs you about $400–$600 in labour to relocate (de-mount the hub, re-mount sensors at the new property, re-pair to the same Ajax account). The hardware moves with you. DIY kits are also movable but their app accounts often don’t survive the migration.

Why doesn’t Mr Secured install Dahua?

Dahua was placed on the Australian government supply-chain restriction list in 2023. Mr Secured runs the Dahua + Ajax stack instead — Dahua holds independent cybersecurity audit certifications, Ajax holds Grade 2 European insurance compliance. Both stacks are approved for residential and commercial Brisbane installs without the supply-chain risk.

Get a fixed-price Ajax quote

Mr Secured offers a free on-site assessment for any Brisbane, Gold Coast, or Sunshine Coast home. You get a fixed-price itemised quote on the day, no obligation. Most homes are quoted, signed, and installed within a single week.

Book at mrsecured.com.au/contact or call 0490 130 339. Or read more about the Ajax alarm system stack on the alarms hub page.

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