Stiff sash lock on a postwar local authority semi-detached house
Common on postwar local authority semi-detached houses across Kingston upon Hull — the timber door has moved seasonally and the mortice case has bound against the keep. We often see this coupled with non-standard door profiles on Airey and precast concrete houses requiring fabricated frame repairs before lock fitting. 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.