How to plan door, window and motion sensors

Before you decide

• Decision to record: Build sensor coverage around likely entry routes, household movement, pets and safe exit rather than counting every opening equally.
• Comparison to make: Contact sensors show an opening; motion sensors cover an area after entry. Glass-break or vibration devices address different events. Layering selected routes can be more useful than buying the largest pack.
• Trade-off to accept: More sensors create more batteries, alerts and false-trigger opportunities. Pet claims depend on placement and animal behaviour, while a bypassed sensor can weaken an entire routine.
• Evidence to verify: Draw entry paths, night and away modes, then test every sensor, tamper alert and notification with household members.