When Your Front Door Won't Open: Common Causes on uPVC and Timber Doors
A front door that stops working rarely does so without warning, though it often feels sudden. On a timber door with a traditional Yale-type nightlatch and a 5-lever mortice deadlock, the usual culprits are a worn key, a seized lever mechanism, or a latch that has dropped out of alignment as the door and frame move with the seasons. Old mortice deadlocks can gum up internally, so the key turns part way and then stops — forcing it risks snapping the key inside the lock, which makes the job harder.
uPVC and composite doors behave differently. They rely on a multipoint mechanism operated by lifting the handle and turning a euro cylinder, and the most frequent failures we see in Tooting homes are a failed gearbox inside the door, a handle that has gone floppy, or a cylinder that has worn or snapped. When the handle lifts but the key won't turn, or the key turns but nothing retracts, that usually points to the mechanism rather than the lock itself. Diagnosing this correctly matters, because replacing a cylinder when the gearbox is the real problem just leaves you stuck again.
When we arrive we assess the door before touching anything, identify whether the fault is the cylinder, the gearbox or alignment, and choose the least invasive route back in. In many cases we can open the door without damage and then repair or replace only the part that has failed. If a part is beyond repair we explain why, confirm the exact up-front price, and only then carry out the work.






