Stiff sash lock on a post-war semi-detached house
Common on post-war semi-detached houses across Coventry — the timber door has moved seasonally and the mortice case has bound against the keep. We often see this coupled with Yale rim lock wear on 1950s terraces. The fix is either service (lubricate and adjust) or replace with a BS3621 equivalent if the existing lock is pre-standard.
Our approach Service first if the mechanism is sound; BS3621 upgrade if the existing lock is sub-standard or worn beyond service.