uPVC Door Lock Repair

A uPVC multipoint lock works by engaging several locking points simultaneously when you lift the handle and turn the key. At the heart of the mechanism sits the gearbox — a metal cassette that converts the movement of the handle into the upward or downward drive of the shootbolts, rollers and hooks positioned along the edge of the door. After years of daily use, the internal springs and cams inside the gearbox wear down. The first sign is usually a handle that feels stiff or starts to drop under its own weight; the second is a key that turns but fails to move the bolts fully into their keeps in the frame. Left too long, the mechanism can seize completely, leaving you unable to lock the door at all — a serious security risk in any part of Slough, particularly on rear-access properties.

The gearbox is make- and model-specific. Measuring the backset, the distance between fixing holes, and the case height matters enormously — fit the wrong cassette and the shootbolts will not align with the keeps, no matter how much adjustment you make to the striker plates. Our technicians assess the existing mechanism, take the correct measurements and, where the right part is in the van, complete the uPVC door lock repair on the same visit. If a less common part needs to be ordered, we can make the door secure before we leave.

Patio and sliding doors present a slightly different challenge. The lock on a sliding door typically runs along a track rather than operating hooks and bolts that project into a frame, and the most frequent failures are worn rollers, a cracked locking strip, or a gearbox that can no longer drive the central bolt into the keep. Sliding door lock replacement is one of the more common call-outs we attend across Slough, particularly on properties with rear gardens where patio doors see heavy use through spring and summer. A door that slides freely but will not lock — or one that locks but will no longer slide smoothly — is both a security concern and a potential insurance issue.

French doors add another layer of complexity because they use two separate door panels, each with its own set of multipoint keeps, and the alignment between the two panels must be correct for all locking points to engage. We carry hardware compatible with the most widely fitted uPVC and composite French door systems, and our technicians are experienced in adjusting both the hinges and the keeps to restore a proper lock-up before fitting any new mechanism.

When we attend a uPVC door lock repair Slough call-out, we do not simply swap the most visible part and leave. The technician inspects the full locking system: the gearbox, all shootbolts and hooks, the keeps in the frame, the euro cylinder, the handle spindle, and the hinge positions. Misaligned hinges are a surprisingly common root cause — if the door has dropped even a few millimetres, the bolts may not be reaching their keeps cleanly, which puts extra load on the gearbox and accelerates wear. Adjusting the hinges and realigning the keeps often extends the life of an otherwise sound mechanism considerably.

We also check the euro cylinder for signs of wear or, critically, vulnerability to cylinder snapping — a known attack method on uPVC doors. If the cylinder protrudes beyond the door furniture, it is exposed. Where a customer wants to upgrade at the same time as a mechanism repair, we can fit a TS007 3-star anti-snap cylinder as part of the same visit, which many insurers across the Slough area now look for as standard. If you need us, call 01753 251949 — we answer 24/7 and will confirm an exact price before any work begins, with no hidden additions once we arrive.

The cost of any door lock installation or lock change Slough job depends on a small number of clear factors: the type and brand of mechanism needed, whether the part is in stock in the van or requires ordering, the time of day (evenings, weekends and bank holidays carry different call-out rates), and travel distance to your postcode district. We confirm the exact price on the phone before we come out, so there are no surprises on the doorstep. We do not ask for payment until the work is agreed and the technician has assessed the door in person.

Beyond straightforward gearbox swaps, door lock replacement Slough requests often involve upgrading an older mechanism to a higher-security standard, or replacing a lock that has been damaged following a failed break-in attempt. In either case, the technician will explain the options available for your specific door — make, profile and existing hardware — and carry out the installation with as little disruption to the door frame as possible. Our aim is always a damage-free repair where the door and frame are left in the same or better condition than when we arrived. For landlords and letting agents managing properties across Slough, we are also familiar with the documentation requirements that often accompany a lock change on a tenanted property.

A failed multipoint mechanism does not wait for business hours. If a gearbox seizes at night, the door either cannot be opened from inside — which raises an immediate safety concern — or cannot be locked, leaving the property vulnerable. As a 24 hour locksmith Slough service, Langley Locksmith operates across all hours, including late nights, weekends and bank holidays. When you call 01753 251949, you speak directly to our team, not an answering service. We send a technician straight away and are usually with you in around 30 minutes, depending on where in Slough you are.

If you are locked out Slough-side because a handle has dropped and the latch has engaged, do not attempt to force the door. Check whether a back door or window is accessible, and whether a spare key is held by a neighbour or family member nearby. If not, our technicians can open most uPVC doors without damage to the frame, using non-destructive entry methods — after which the failed mechanism is replaced so the door locks correctly again. We ask for proof of residence as a standard part of our process, which protects both our customers and the properties we work on.