Locksmith Service

uPVC Door Lock Repair

uPVC doors are the standard choice across Lewisham — from the terraced houses lining Hither Green Lane to the blocks of flats near Lewisham town centre — and their multipoint locking mechanisms take a serious amount of daily punishment. When the handle lifts but the door does not dead-lock, when the key turns halfway and sticks, or when a hook bolt refuses to engage its keep, the fault almost always lies in the gearbox or the multipoint mechanism itself, not the euro cylinder. Getting that diagnosis right from the start saves time and avoids unnecessary parts costs.

Call 020 3757 5731 Get a fast quote

Open 24 hours, 7 days a week · Fully insured

Lewisham Locksmith is a mobile, 24/7 service covering the full Lewisham area. Our trained and insured technicians carry a wide selection of replacement multipoint mechanisms, gearboxes, euro cylinders, and ancillary hardware in the van, so the majority of uPVC door lock repair jobs are completed in a single visit. We confirm an exact up-front price on the phone before anyone sets off, and wherever the condition of the door allows it we work without causing damage to the frame or the sash.

What we do

Available 24/7

Day, night, weekends and bank holidays — a real local locksmith answers and sends a fully-stocked van.

We come straight away

Based in Lewisham, we send a locksmith straight away — we're usually with you in about 30 minutes.

Fully insured

Vetted locksmiths, a clear price on the phone, and no surprise add-ons when we arrive.

Damage-free entry

We pick and bypass locks the right way, so most lockouts are solved without drilling anything.

How uPVC Multipoint Mechanisms Actually Fail — and Why It Matters

A uPVC multipoint lock is not a single lock — it is a strip of interconnected components running the full height of the door, usually including a central latch, two or more hook bolts, roller cams, and anti-lift pins. All of these are driven by a central gearbox, which is the small cassette that sits behind the handle spindle. When the gearbox wears out — a process that is accelerated by doors that are slightly out of alignment, or by handles being lifted too hard — the other components still look intact but nothing engages correctly. The most common symptom is a handle that lifts freely in the locked position but does not throw the hooks. A close second is a handle that becomes very stiff or drops under its own weight, indicating a broken internal spring inside the gearbox cassette. Neither of these faults can be fixed by oiling the mechanism: the gearbox needs to be replaced.

Identifying the correct replacement gearbox is where experience matters. There are dozens of different case sizes, hook configurations, and backset measurements in circulation across UK uPVC door manufacturers, and fitting an incorrect cassette simply means the hooks will not align with the keeps in the frame. Our technicians measure the existing mechanism, identify the type — whether that is a Fullex, Yale, Mila, Avocet, or another common pattern — and source a compatible unit from the stock carried in the van. For patio and sliding doors the mechanism is a different design entirely; the sliding door lock replacement process involves disengaging a roller-based or hook-based cassette that runs along the bottom rail, and the tolerances are tighter because misalignment causes the door to lift off its track.

yale lock front door — Lewisham Locksmith

uPVC Door Lock Repair: Front Doors, Back Doors, and Patio Doors

On a standard uPVC front door the euro cylinder controls whether the multipoint mechanism can be operated from the outside, but it is the gearbox that controls whether the hooks and locking points actually fire. These are two separate components, and confusing them leads to unnecessary cylinder replacements that leave the underlying fault untouched. Where we do replace a cylinder — for instance after a failed snap attack, which remains a genuine risk on older uPVC front doors across SE13 and SE6 postcodes — we fit anti-snap, TS007 3-star rated cylinders as standard, since many home insurers in Lewisham now make this a policy condition. Back doors and French doors follow the same multipoint logic as front doors but are more frequently subject to frame drop due to the extra glass weight, which pulls the door out of square and causes the hooks to bind against the keeps rather than entering cleanly.

Patio doors present their own category of fault. The locking strip on a sliding patio door typically runs along the meeting stile, and the hooks or pins engage into keeps in the fixed panel. If the door has sagged on its rollers over time, the keeps and hooks no longer line up and the door either will not lock at all or locks only under force. Before fitting a new mechanism on a patio door we always check the roller adjustment first, because correcting the door height often resolves the locking problem without any parts being needed. When a new sliding door lock replacement is unavoidable, we fit the mechanism, re-align the keeps, and test through the full range of movement before leaving the site. If you need a technician sent out today, call 020 3757 5731 — we answer around the clock, every day of the year including bank holidays.

What a Professional uPVC Door Lock Repair Visit Covers in Lewisham

When a technician arrives at your door they carry out a structured assessment before any parts are ordered or removed. This includes checking the door alignment against the frame, testing the handle torque, inspecting the cylinder for signs of snap damage or wear, and running the mechanism through its full locking sequence. This process is what separates a proper door lock repair from a straight swap-and-go job that may leave the root cause unaddressed. Where the frame or the door sash itself has warped — something that happens frequently in older uPVC doors exposed to years of south-east London weather — we advise on adjustment options before recommending a replacement, because fitting a new gearbox into an out-of-square frame will shorten the life of the new part considerably.

The range of work our technicians cover in Lewisham includes: multipoint mechanism replacement on front uPVC doors; gearbox cassette replacement where the outer mechanism is intact; euro cylinder replacement to TS007 anti-snap standard; hook bolt realignment and keep adjustment; patio door sliding lock replacement and roller adjustment; French door multipoint lock repair; door handle spindle and backplate replacement where the spindle has sheared; anti-lift block replacement on sliding doors; and emergency boarding where a door has been forced and cannot be secured. All work is carried out by trained and insured technicians who operate from a fully equipped mobile unit — there is no shop to visit; we come directly to your property anywhere in the Lewisham area, usually within about 30 minutes of your call.

Pricing, Call-Out Charges, and What Determines Your Quote

We do not quote prices on this page because the cost of a uPVC door lock repair genuinely varies depending on several factors: the type of mechanism required (a standard gearbox cassette is a very different part to a full-length multipoint strip), the brand and configuration of the existing lock, whether the cylinder also needs replacing, the time of day your call comes in — evenings, weekends, and bank holidays carry a different call-out rate — and your location within our service area. What we commit to is transparency: before any technician leaves for your address, we walk you through the job on the phone, confirm exactly what the visit will cover, and give you a fixed price. There are no hidden extras added on arrival. If the job turns out to be more involved than the initial description — for example, if a door that was described as sticky turns out to have a sheared spindle and a cracked keep — we explain the additional work and confirm any change to the price before proceeding.

The same approach applies whether you are a homeowner, a tenant managing a repair your letting agent has not yet dealt with, or a managing agent responsible for a block of flats in Lewisham town centre. We work across all property types and are accustomed to liaising with landlords, housing associations, and estate agents where access arrangements or authorisation need to be coordinated. For anything urgent — a door that will not lock overnight, a mechanism that has failed on a cold evening — call 020 3757 5731. We answer 24/7 and send a locksmith straight away.

Frequently asked questions

How do I know if my uPVC door needs a new gearbox or a new cylinder?

If your key turns and operates the cylinder correctly but the hooks or locking points do not engage when you lift the handle, the gearbox is almost certainly the fault. If the key is difficult to insert, turns stiffly, or the cylinder has visible signs of damage — particularly a split or deformed front face, which is a sign of a snap attack — the cylinder is more likely the issue. In practice both components are assessed on arrival, because a door that has had a snap attempt may have a compromised cylinder and a bent gearbox drive in the same incident.

My patio door handle lifts but the door will not lock — is that the gearbox or the rollers?

It could be either, or a combination. On a sliding patio door the most common cause of a locking failure is the door sitting too low on its rollers, which means the hooks in the locking strip no longer line up with the keeps in the fixed panel. Before replacing any mechanism we always check and adjust the roller height first. If the alignment is correct and the hooks still do not fire, the gearbox or locking strip itself needs to be replaced. A proper sliding door lock replacement will also include keep adjustment to make sure everything lines up correctly once the new mechanism is in place.

Can you carry out uPVC door lock repairs on evenings, weekends, and bank holidays in Lewisham?

Yes. We operate 24 hours a day, seven days a week, including weekends and bank holidays. The call-out rate does vary depending on the time of day, and we confirm the exact price before sending anyone out. If your door mechanism has failed late at night or over a weekend, call 020 3757 5731 and we will send a technician to you, usually arriving in about 30 minutes.

Will the repair damage my uPVC door frame?

The vast majority of gearbox and multipoint mechanism replacements on uPVC doors are non-destructive. The mechanism is accessed through the edge of the door after removing the internal handle backplate, and the euro cylinder is released with a single screw. No drilling into the frame is required in a standard replacement. Where a door has been forced and the frame or sash is damaged, we will advise on what repair or boarding work is needed and confirm whether that can be completed on the same visit.

What factors affect how much a uPVC door lock repair costs?

The main factors are: the type and brand of mechanism required, since some configurations are more complex or less commonly stocked than others; whether the euro cylinder also needs replacing; the time of day — evenings, weekends, and bank holidays have a different call-out rate; and your location within the Lewisham service area. We confirm the exact price on the phone before anyone travels to your address, so you always know the full cost before work begins.

My door lock has a keypad — can you change the code or repair it?

Keypad entry systems on residential doors are outside the scope of our standard uPVC multipoint lock service, which covers mechanical gearboxes, euro cylinders, and multipoint strips. If you are unsure whether your door has a mechanical or electronic locking system, call us on 020 3757 5731 and we can talk through what you have and advise on the right course of action before you book a visit.

Locked out or need a lock fixed? We are on the way.

020 3757 5731