uPVC & Composite Door Lock Specialist in Croydon

uPVC doors can become difficult to lock for several reasons. The most common cause is the door dropping or shifting due to hinge wear, which causes the hooks and rollers in the multipoint lock to misalign with the keeps on the frame. Gearbox wear is another frequent issue — the internal mechanism that drives the locking points wears out over time. Temperature changes can also cause uPVC frames to expand and contract, creating intermittent locking problems. Our locksmiths can diagnose the exact cause and fix it on-site.

A multipoint lock gearbox replacement in Croydon typically costs between £95 and £160, depending on the brand and type of mechanism. This includes the new gearbox, fitting, and testing. If additional components are needed — such as new keeps, handles, or cylinders — these are quoted separately. We always confirm the full cost before starting work.

In most cases, yes. Our locksmiths carry a wide range of multipoint lock gearboxes from manufacturers including Mila, GU, Yale, Fullex, Lockmaster, ERA, and Winkhaus. We identify the correct replacement by measuring the backset, centres, and overall length of your existing mechanism. If an exact match is not available on-van, we can source it and return to fit — usually within 24 to 48 hours.

Absolutely. Composite doors use the same multipoint locking systems as uPVC doors, so our expertise covers both. We repair and replace gearboxes, cylinders, handles, and hinges on all major composite door brands including Rockdoor, Solidor, Endurance, and Doorstop.

A floppy or drooping door handle is almost always caused by a broken spring cassette inside the multipoint lock gearbox. The spring is responsible for returning the handle to its horizontal position after use. In some cases, just the spring cassette can be replaced. However, if the gearbox itself is worn, a full gearbox replacement may be more cost-effective and provide a longer-lasting fix.