Short answer
A Home Assistant alarm setup should start with reliable local triggers and a clear arming state. Add door sensors and motion sensors first, then notifications, sirens, camera verification, and entry delays before treating it as a security-critical system.
Core alarm pieces
- Door and window sensors
- Motion or presence sensors
- Away/home/night arming state
- Siren or alert path
- Camera verification
- Optional keypad or dashboard control
Avoid these mistakes
- Using phone presence as the only arming condition
- Triggering sirens without an entry delay
- Depending on cloud-only events for critical alerts
- Skipping camera verification for high-risk alerts
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