Smart Lock Auto-Lock and Geofencing Guide¶

Guide to auto-lock and geofencing features on UK smart locks covering automatic locking configuration, proximity-based unlock, safety considerations, and battery impact.

Auto-Lock Features and Configuration¶

Auto-lock automatically locks your door after it has been opened and closed, preventing accidental unlocked doors. Recommended UK setting: 30 seconds - long enough to exit but short enough to prevent the door remaining unlocked. Instant lock (0 seconds) can trap users stepping out briefly. Auto-lock uses a door position sensor (magnetic contact or accelerometer). Ensure correct alignment - misalignment is the most common cause of failure. Some locks support conditional auto-lock (only overnight or when no one is home via geofencing). Auto-lock draws slightly more battery power (5-10% reduction).

Geofencing Configuration¶

Geofencing uses phone GPS to trigger lock actions. Set radius to 100-200 metres for typical UK homes. Arrival: auto-unlock when you approach. The lock detects your phone via Bluetooth within 20-30 metres. Departure: auto-lock when all family members have left. Safety: auto-unlock should require the phone on your person. Configure PIN backup for dead phone batteries. Multi-phone households: the lock should only auto-unlock when the primary phone approaches. Most apps allow per-user geofencing settings. Battery impact: geofencing uses phone GPS (5-10% daily phone drain). Lock Bluetooth polling increases consumption by 10-15%.

Specifications and Comparison¶

Feature	Recommendation	UK Consideration	Battery Impact
Auto-Lock Delay	30 seconds	Standard for UK homes	5-10% reduction
Auto-Unlock Radius	100-200m	UK terraced house separation	Minimal
Geofencing Type	Bluetooth + GPS hybrid	Works in UK urban areas	10-15% reduction
Door Sensor	Magnetic contact	Check alignment monthly	No battery impact
Manual Override	Always available	Essential for UK winter	No impact

FAQ¶

Can auto-lock be dangerous?: Set the delay to 30 seconds minimum. Most locks include a privacy mode that temporarily disables auto-lock.
Does geofencing work in UK flats?: Yes - GPS works at building level. Bluetooth range in flats with concrete floors may be reduced.
Will auto-unlock work if my phone is in my bag?: Yes - Bluetooth proximity detection works through bags and pockets within 5-10 metres. For more information see our Smart Lock Temporary Access Codes Guide.

Last updated: 2026-05-31.

External Resources¶

For further information consult authority guidelines at the Royal Society for the Prevention of Accidents.