Patio & French Door Locks

A uPVC patio slider or a pair of French doors does not use the same locking system as a standard timber front door. Instead of a single 5-lever mortice deadlock set into a thick frame, these doors rely on a multipoint locking mechanism — a long strip of metal running the full height of the door panel that throws several locking points simultaneously when you lift the handle and turn the key. Those points typically include hooks, rollers, a latch, and a locking point. The euro cylinder inserted into the gearbox drives all of them from one keyhole. When any part of that chain fails, the whole door becomes unreliable.

French doors introduce an additional complexity: the meeting stile. Where the two leaves come together, the active door usually carries a mortice lock for French doors — either a standard mortice latch or, on higher-specification installations, a 5 lever rebated mortice lock for French doors, which accounts for the angled rebate where the two panels overlap. The passive leaf is typically held by espagnolette bolts at top and bottom. If those bolts become stiff or the keeps drop out of alignment, the door rattles, draughts, and the whole unit feels insecure — even when it technically is locked.

The most frequent call-out we attend in Camberwell involves a uPVC door where the handle has become floppy and the locking points no longer engage. This usually means the gearbox inside the multipoint mechanism has sheared — a known wear point on doors that are ten or more years old. We carry replacement gearboxes and full multipoint strips from leading hardware manufacturers, so we can swap the failed component and have the door locking correctly the same day. A close second is cylinder failure: the euro cylinder turns but nothing happens, which often means the cam that connects the cylinder to the gearbox has broken, or the cylinder itself has worn past the point of reliable operation. We replace the cylinder with an anti-snap, anti-pick euro cylinder as standard, because euro cylinder snapping remains a real method of forced entry and Camberwell properties are not exempt from that risk.

On French doors specifically, we often attend jobs where the french door lever lock or french door knob lock has detached from the mortice case inside the door, leaving the occupant unable to operate the locking mechanism at all. We also carry out adjustments to the door frame and striker keeps when alignment has drifted — a common consequence of London clay subsoil movement, which causes door frames to shift subtly over the years. If a customer has been managing by lifting the door as they close it, or by forcing the handle upward with extra effort, that is a clear sign the hinges, keeps, or the gearbox itself need attention before the door fails completely.

When our technician arrives — we send someone straight away and are usually with you in around 30 minutes — the first step is a proper assessment of the existing mechanism. On uPVC patio sliders this means checking the multipoint strip, the cylinder, the handle spindle, and the condition of the frame and keeps. On French doors, we examine both leaves: the active leaf's mortice lock or multipoint mechanism, the french door mortise lock case if one is fitted, and the passive leaf's espagnolette bolts. We also check the glazing beads, because on older uPVC doors the beads are sometimes accessible from outside, which is a vulnerability worth addressing at the same time as the lock replacement.

Wherever possible we work damage-free, using the correct removal tools rather than force, so the door frame and the uPVC profile are undamaged. This matters particularly in rented properties in Camberwell, where tenants need to coordinate with letting agents and cannot afford to leave the door in a worse condition than they found it. We always confirm an exact up-front quote on the phone before coming out — the final figure reflects the type of lock or mechanism required, the parts needed, the time of day, and travel distance, so there are no surprises when the job is done. If you manage a commercial property or a block of flats and need a commercial door locksmith who understands multipoint systems at scale, our team handles those calls on the same 24-hour basis. Call 020 3757 5826 and we will talk through what you need before anyone travels.

A question we hear regularly is how to lock French doors with lever handles correctly, particularly when the mechanism has been misbehaving. The proper sequence on a multipoint-equipped French door is: close the passive leaf first and shoot its top and bottom espagnolette bolts, then close the active leaf, lift the lever handle fully upward to engage all the multipoint locking points, and finally turn the key to deadlock the cylinder. If lifting the handle does not feel firm, or the key turns but the door still moves in the frame, the mechanism is failing and operating it repeatedly risks making the fault worse — or leaving the door jammed shut or open at an inconvenient moment.

On French doors fitted with a french door mortise lock set rather than a full multipoint strip, the same principle applies: the handle operates the latch, the key deadlocks the mortice case, and the passive leaf is secured independently. If the mortise lock french door mechanism is stiff, the key difficult to turn, or the latch not springing back, those are signs of internal wear or misalignment rather than user error. Attempting to force the mechanism risks shearing the cam or the follower inside the case. The safer course is to call our team for a proper diagnosis — we are available around the clock, including late evenings and bank holidays, and our skilled technicians carry the parts to resolve most faults in a single visit. For anything urgent, call 020 3757 5826 — we answer 24/7.

A failed patio or French door lock can leave you locked out of your own garden, your ground floor flat, or your entire property if the rear door is the only practical exit. As a 24 hour locksmith London service covering the SE5 postcode and the wider Camberwell area, we respond to these calls at all hours. When you ring, we ask a few straightforward questions to confirm ownership or occupancy of the property — this is standard practice and nothing to be concerned about — and then we advise on whether there is a secondary entrance worth trying before we travel. If there is no safe alternative, we come to you, assess the door, and open it using the correct non-destructive method wherever the lock condition allows. Where the cylinder or mechanism is beyond saving, we carry out a lock change London as part of the same visit so the door is fully secure before we leave. Our upvc door lock repair London calls are among the most common we attend, and our technicians are experienced with every major brand of multipoint mechanism on the market.