Why Locks Fail: What Our Lock Repair Technicians Find Most Often
The most frequent causes we see on call-outs across Sidcup are worn internal components, a build-up of old lubricant or grit inside the mechanism, a misaligned door or frame that puts the bolt under constant lateral pressure, and euro cylinders that have been attacked or simply reached the end of their working life. On uPVC and composite doors — which are common on newer builds and housing association properties throughout DA14 and DA15 — the multipoint locking mechanism itself can seize if the door has dropped even a few millimetres on its hinges, making the handle feel impossibly stiff or causing the key to jam mid-turn. On older properties with a traditional 5-lever mortice deadlock and a Yale-type nightlatch, the lever pack can wear, springs can fatigue, and the bolt can begin to drag against a strike plate that has shifted over years of seasonal movement in the door frame.
Rim locks, cam locks, and the lever lock mechanisms found on internal and communal doors in blocks of flats are equally susceptible to wear — particularly in buildings where the door sees heavy daily use. Keypad lock and smart lock systems introduce an additional layer of complexity: the electro-mechanical actuator can fail independently of the digital side, meaning the door reads your code correctly but the bolt still won't retract. Whatever the fault, our technicians carry a wide range of spare components and work on-site, so the vast majority of repairs are completed in a single visit.