BS 8621 Thief resistant locks with keyless egress (thumb-turn or push-pad)
Same attack resistance as BS 3621 but with keyless exit from inside. Expected on commercial premises, HMOs and flats where an escape route applies.
What it actually decides
- Keyless egress from inside without a key
- Same forced-entry resistance as BS 3621
- Suitability where fire-escape rules apply
Applies to these lock types
5-lever mortice deadlock (BS 3621) · UK oval cylinder (uPVC and composite doors)
Why a retrofit designer cares
Any smart retrofit on an escape route must preserve keyless egress. This standard is the clearest statement of that requirement in a lock specification.