letter no. 1
Do I need my landlord's permission to install a smart lock?
the desk replies — Yes, in practice you do — the door and its lock belong to the landlord, and unapproved modifications risk deposit deductions at handover. Get consent in writing, keep the original lock and cylinder to refit when you leave, and in towers also check with building management, since fire-rated entrance doors are often protected from any modification. Retrofit locks that fit over the existing thumb-turn avoid most of these problems entirely.