uPVC Door Lock Repair

A uPVC door does not use a traditional mortice deadlock in the way a timber door does. Instead, it relies on a multipoint lock — a tall metal cassette running the full height of the door edge — that drives hooks, rollers, deadlocks and a latchbolt simultaneously when you lift the handle and turn the key. The gearbox, which sits at the mid-point of that cassette, translates the motion of the handle into movement along the mechanism. When the gearbox wears, the linkage strips, or a hook seizes, the door may still close but it will not lock securely, or it will lock but you cannot get it open again. Common failure patterns we see regularly in Fulham include: a handle that lifts but does not drive the locking points home; a door that locks from the outside but the euro cylinder has become stiff or is showing signs of snap vulnerability; a sliding door lock replacement scenario on a patio door where the bottom roller has collapsed and the door drops off its track; and French doors where only one leaf is engaging its keeps properly.

The fix depends entirely on what has failed. Sometimes only the gearbox needs changing — a relatively contained job. Other times the entire multipoint cassette needs to come out and a new one go in. We also often find that the euro cylinder has been in service for many years without any anti-snap protection, which matters enormously in an area like Fulham where residential burglary does occur. If the cylinder is at risk, we will tell you plainly and can carry out a cylinder upgrade at the same visit. What we will not do is tell you everything needs replacing when only one component has failed — a thorough diagnosis comes first, every time.

Gearbox replacement is the most common uPVC door lock repair we carry out in Fulham. The gearbox is a compact unit, but sourcing the right one matters — there are dozens of mechanism profiles and backset measurements in circulation, and fitting an incorrect gearbox will leave the locking points mis-aligned with the keeps in the frame, which is both insecure and damaging to the door over time. Our technicians measure the existing mechanism carefully before selecting a replacement from the van stock, and where a less common cassette size is needed, we will source it and return promptly rather than bodge a near-fit replacement.

For patio and sliding doors, the repair work is distinct from a hinged-door job. Sliding door lock replacement typically involves removing the door from its track, accessing the internal lock cassette, replacing the hook bolt or roller latch mechanism, and re-hanging the door correctly so it slides smoothly and locks at the correct engagement depth. We also check the condition of the keeps and the adjustment of the frame, because a door that drops or sits out of square will wear the new mechanism quickly. On French doors and back doors in Fulham gardens, we pay particular attention to the passive leaf — the fixed panel that often has only shoot bolts holding it, and which is frequently the weaker point of the two. If you have been searching for a door lock installation that is done properly rather than quickly, that thoroughness is what we bring to every job.

A broken multipoint mechanism can leave you locked out of your own home with no warning. The handle lifts, nothing happens, and the door simply will not open. This is one of the most common reasons residents in Fulham call us as an emergency locksmith London service, particularly late in the evening after returning home. If you find yourself in that situation, check whether a rear door or window is accessible and whether a trusted neighbour holds a spare key — but do not attempt to force the door yourself, as uPVC door frames and locking keeps are surprisingly fragile under uneven pressure and can cost significantly more to repair than the mechanism itself.

When you call 020 7871 7823, our team will ask a few quick questions to understand what type of door and mechanism you have, confirm an exact up-front price before anyone sets off, and dispatch a technician straight away. We are usually with you in about 30 minutes. We work as a 24 hour locksmith London service — there is no cut-off time, no answerphone at midnight, and no surcharge structure we hide from you. The call-out charge and any parts cost are explained clearly on the phone before we come out. Our goal is always to open the door without damaging the frame, then carry out the necessary repair or replacement immediately so the door is fully secure before we leave.

A lock change London call is not always about a broken mechanism — sometimes it is about peace of mind. If you have recently moved into a Fulham flat or house and do not know how many keys are in circulation, if a tenancy has ended and a letting agent needs the locks changed before new tenants move in, or if your cylinder is an older, standard Euro profile without anti-snap features, a cylinder replacement is a straightforward and sensible step. We fit TS007 3-star rated anti-snap cylinders as standard when upgrading, which is what most home insurers now expect on uPVC and composite doors in London.

It is worth being clear about what a cylinder change does and does not cover. Changing the cylinder — which is what locksmiths mean when they talk about how to change a door lock on a uPVC door — replaces the barrel that the key operates, but it does not address a worn gearbox or a failing multipoint cassette. If both the cylinder and the mechanism are compromised, we will tell you that upfront and carry out both elements of the work in one visit. We do not operate any keypad door lock systems on standard residential uPVC doors, so questions around how to change code on a keypad door lock are outside the scope of this particular service — but if your property has a traditional multipoint uPVC lock and needs any element of it repaired, upgraded or replaced, we have it covered. Call 020 7871 7823 any time — we answer 24/7.

We do not publish fixed price lists, because the cost of a uPVC door lock repair or replacement depends on several factors that vary from door to door. The main ones are: the type and brand of mechanism in the door (some cassettes are significantly harder to source than others); whether only the gearbox needs replacing or the entire multipoint cassette must come out; the condition of the euro cylinder and whether an upgrade is needed at the same time; the time of day the work is carried out, since evening, weekend and bank holiday call-outs reflect the hours worked; and travel distance across the Fulham area. None of these factors are hidden from you — when you call, we ask the right questions, work out exactly what is likely to be involved, and give you a clear, confirmed price before a technician sets off. There are no surprises on the invoice.