How a no-fee alarm system works

A DIY alarm consists of a central hub, door/window sensors, a siren and a mobile app. When a sensor is triggered, the hub activates the siren and sends a push notification to your phone. Everything works over your home WiFi — no monitoring company, no monthly contract.

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No-fee vs monitored alarms

A monitored alarm (with CRA — security company) costs €20–50/month but ensures a trained operator responds even if you're unavailable. A DIY alarm sends alerts only to your phone. For most homes, a DIY system is perfectly adequate.

System options by budget

Basic

Starter kit

€80–150

  • Hub + 2 door sensors
  • Internal siren
  • App alerts
  • Battery backup
  • Easy self-installation
⭐ Best choiceComplete

Full home kit

€200–350

  • Hub + 4–6 sensors
  • External siren (110 dB)
  • Motion detector
  • Camera integration
  • Optional professional monitoring
Advanced

Smart home alarm

€300–600

  • Full sensor coverage
  • Smart lock integration
  • Video doorbell
  • Amazon Alexa / Google Home
  • Remote arm/disarm

Recommended systems

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Ajax StarterKit

Premium wireless alarm. Encrypted radio protocol (can't be jammed). Expandable. Optional professional monitoring. From €200.

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Reolink Alarm Kit

Good value kit with hub, sensors and siren. Integrates with Reolink cameras. App alerts, no monthly fee. From €100.

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Ring Alarm

Well-known brand, excellent app, easy installation. Professional monitoring optional (€8/month). Works standalone for free. From €150.

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Somfy Protect

French brand, premium build quality. Indoor and outdoor siren. Optional professional monitoring (€5/month). From €180.

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Frequently asked questions

The local siren will still activate. App notifications require internet. Premium systems (Ajax) use GSM backup — they can send SMS alerts even without WiFi. Basic systems only rely on WiFi.
Internal sirens: 85–95 dB. External sirens: 105–115 dB. For reference, 110 dB is louder than a chainsaw. An external siren mounted visibly on the facade is also a significant deterrent — most burglars avoid alarmed properties.