Stiff sash lock on a back-to-back Victorian terrace
Common on back-to-back Victorian terraces across Leeds — the timber door has moved seasonally and the mortice case has bound against the keep. We often see this coupled with worn Yale nightlatches on back-to-back terraces needing replacement. 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.