Patio & French Door Locks
Patio sliders and French doors are a popular feature in Eltham homes — from the Victorian terraces off Well Hall Road to the newer-build houses near Eltham Park South — and they create a light, open connection between the garden and the living space. That same openness, however, makes them a target for opportunistic break-ins if the locking mechanism is worn, misaligned, or simply not up to the job. Whether your multipoint lock has dropped a hook, your roller latch no longer engages, or a forced entry attempt has left the frame damaged, Eltham Locksmith is here to put it right.
Open 24 hours, 7 days a week · Fully insured
We are a 24/7 mobile locksmith service covering Eltham and the surrounding SE9 area. Our trained, insured technicians come directly to your door — no waiting for a shop appointment, no dismantling by an inexperienced hand. We carry a range of replacement parts for the most common uPVC patio and French door systems, and wherever the situation allows we work damage-free, so the door and frame are left in the same condition we found them. Call 020 3757 5833 any time of the day or night, including weekends and bank holidays.
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 Eltham, 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.
Why Patio & French Door Locks Fail — and What We Find in Eltham
The majority of uPVC patio sliders and French doors use a multipoint locking system: a long cassette running up the edge of the door that throws several hooks, rollers, or mushroom-cams into keeps set into the frame when the handle is lifted and the cylinder turned. Over time — through repeated use, seasonal expansion and contraction of the uPVC, and simple wear — the gearbox inside that cassette begins to slip. You will notice it first as a stiff handle that needs forcing, or hooks that engage only halfway and leave the door feeling loose. Left unattended, the mechanism can seize entirely, leaving you either locked out or, worse, with a door that will not secure properly overnight.
French doors present a slightly different profile. Each leaf can carry its own independent locking points, and the meeting-stile — where the two doors come together — relies on either a surface-mounted espagnolette bolt or, on older timber-framed sets, a french door mortise lock set into the edge of the door. A worn french door lever lock at that meeting stile is one of the most common faults we see: the spindle wears, the handle droops, and the door appears locked when in fact it is barely held. We also regularly replace euro cylinders on French doors where the existing cylinder shows signs of snap vulnerability — a technique burglars in south-east London are known to exploit.
Patio & French Door Lock Repairs: What Our Technicians Actually Do
When we arrive — usually within about 30 minutes of your call — our first step is a thorough assessment of the door, frame, and existing hardware. For a uPVC patio slider, we check the alignment of the door within the frame (a dropped door causes the hooks to miss their keeps), the condition of the gearbox cassette, the euro cylinder, and the handle spindle connection. Many apparent lock failures are actually alignment issues that can be resolved by adjusting the hinges or the keeps without replacing the full mechanism. Where the gearbox is genuinely failed we remove it, source the correct replacement cassette — matching the brand and hand of the original — and fit it to restore full multipoint engagement.
For French doors the process extends to both leaves. We inspect the french door mortise lock or mortise lock set at the meeting stile, check the condition of each euro cylinder, and test the espagnolette rods top and bottom where they exist. A common fault is a 5 lever rebated mortice lock for french doors that has lost its spring or whose bolt has worn flat — that lock cannot be operated reliably and should be replaced rather than lubricated and ignored. We carry rebated mortice locks and standard multipoint cassettes on the van, and we can usually complete a full two-leaf French door repair in a single visit. Our technicians will talk you through what they have found and confirm an exact, up-front quote before any parts are ordered or any work begins.
Lock Change London: Upgrading Security on uPVC Patio and French Doors
Repairing a failed mechanism is the immediate fix, but it is worth asking whether the lock that failed was adequate in the first place. Many uPVC patio doors and French door sets installed before around 2015 came with euro cylinders that offer little resistance to snapping. A snap attack takes seconds: a burglar breaks the outer portion of the cylinder, turns the exposed cam with a screwdriver, and the door opens. Upgrading to an anti-snap, anti-pick, anti-drill cylinder — particularly one rated to TS007 3-star or equivalent — closes that vulnerability entirely. As part of any lock change London service we also check that the keeps and hooks are heavy enough to resist lever attack, and advise on reinforcing the door frame if the existing timber or uPVC sub-frame shows signs of weakness.
For French door sets specifically, we can upgrade from a basic french door knob lock or a worn lever latch to a full multipoint system where the entire edge of the door becomes the locking zone. We also advise on how to lock french doors with lever handles correctly — a common question from homeowners who have inherited a door set and are unsure whether lifting the handle before turning the key is necessary (it is, on virtually all uPVC multipoint systems). Getting that habit right means every locking point is engaged every time, not just the latch. If you are a landlord or letting agent managing a property in Eltham, we are equally comfortable working alongside tenants and can liaise with managing agents to arrange access and confirm completed work. Call 020 3757 5833 to speak with our team now.
Emergency Locksmith London: Locked Out of a Patio or French Door
Being locked out London-side of a patio slider or French door is a specific frustration: these doors are rarely fitted with an external keyhole on the handle itself, so there is no obvious way back in. Our 24 hour locksmith London team handles exactly these situations. When you call, we ask a few quick questions to understand the door type, the lock configuration, and your location in or around SE9. We then send a technician straight away and are usually with you in about 30 minutes. On arrival we first ask you to confirm ownership or authority to access the property — a quick, standard check that protects both you and us — before we begin any work.
Where the door lock has seized rather than being deliberately locked, the approach is different from a standard lockout, and our experienced technicians know how to distinguish between a failed mechanism and a locked cylinder. In both cases we work damage-free wherever the situation allows: forced entry is a last resort, not a first one. If you are locked out and unsure whether a window or another door might have been left unlocked, it is always worth checking before calling — but if you are stuck, do not leave it and do not attempt to force the door yourself, as uPVC frames crack easily and the resulting repair bill will far exceed a professional call-out. The call-out charge and any parts costs are confirmed with you on the phone before we set off.
upvc Door Lock Repair London: What Determines Your Quote
We are regularly asked what a repair or replacement will cost, and we understand why — nobody wants a surprise bill at the end of a stressful situation. Rather than publishing a price list that cannot account for the variables involved, we confirm an exact up-front quote over the phone or on arrival, before any work begins. The factors that shape that quote are straightforward: the type and length of the multipoint cassette required, whether the euro cylinder also needs replacing, the time of day (evening, weekend, and bank holiday call-outs reflect the hours worked), and any additional parts such as a new handle, spindle, or keeps. Travel within the Eltham area is factored in from the outset. There are no hidden additions once the job is under way — if the technician discovers something that changes the scope, they will tell you and get your agreement before continuing.
Our upvc door lock repair London service covers everything from a simple gearbox swap on a single patio slider to a full two-leaf French door lock change London with cylinder upgrade on both leaves. The same trained, insured technicians who handle standard residential repairs also work on commercial premises — a french door mortise lock on a garden room office, multipoint locks on a rear-access commercial door, or a patio-style glazed entrance on a small business unit. For commercial door locksmith enquiries we simply need a little more information about the door configuration and operating hours so we can ensure we bring the right parts first time.
Frequently asked questions
My patio door handle lifts but the hooks do not engage — can this be fixed without replacing the whole door?
In most cases, yes. A handle that lifts without engaging the hooks usually points to a failed gearbox cassette inside the multipoint mechanism rather than a problem with the door or frame itself. We remove the cassette, source the matching replacement — there are dozens of different cassette profiles in circulation — and refit it. The door, frame, and glazing are untouched. We carry a wide range of cassettes on the van and can usually complete the repair in a single visit. If the keeps are also misaligned we adjust those at the same time.
How do I lock French doors with lever handles — do I need to lift the handle before turning the key?
On virtually all uPVC French doors fitted with a multipoint lock, yes: you need to lift the lever handle to draw the hooks and rollers into their keeps, and then turn the euro cylinder key to hold them in the locked position. If you turn the key without lifting the handle first, only the central latch bolt is engaged and the door is not properly secured. Some older French door sets use a surface-mounted espagnolette bolt operated separately at the top and bottom of each leaf — in that case the handle and the espagnolette are independent and both need to be operated. If you are unsure about your specific door, we are happy to come out and walk you through the mechanism and check everything is working as it should.
What is a rebated mortice lock and when does a French door need one?
A rebated mortice lock — sometimes written as mortice lock — is a lock where the faceplate and bolt are stepped (rebated) to fit the overlapping meeting stile of a pair of French doors. Standard mortice locks have a flat faceplate that cannot accommodate that overlap, so they simply will not fit or will not throw correctly on a French door set. Where a client has a timber-framed French door set with a central meeting stile, a 5 lever rebated mortice lock for french doors is usually the correct specification. For uPVC French doors the equivalent function is typically handled by the multipoint cassette on each leaf, but some installations add a mortise lock for french doors at the meeting stile as a secondary measure. Our technicians assess the door set and recommend the right hardware for both security and smooth operation.
What factors affect the cost of a patio or French door lock repair?
Several things shape the final figure: the type, brand, and length of the multipoint cassette or mortice lock needed; whether the euro cylinder also requires replacement; whether both leaves of a French door set need attention; the time of day, since evening, weekend, and bank holiday call-outs reflect the hours worked; and travel distance within the Eltham area. We confirm an exact price with you before any work begins — either over the phone once we understand the door and fault, or on arrival if the technician needs to inspect the mechanism first. There are no additions added after the fact without your agreement.
Can you work on the rear French doors of a commercial property, not just residential homes?
Yes. Our commercial door locksmith service covers uPVC and timber French door sets on small business premises, garden-room offices, studios, and similar. The hardware specification is often the same as a residential set, though commercial doors sometimes have heavier-duty gearbox cassettes or additional locking points. We work around your operating hours where we can, and we are available 24 hours a day for emergency situations. When you call 020 3757 5833, let us know it is a commercial property so we can ensure we have the right parts on the van before we set out.
Is it safe to try to force my uPVC patio door open if I am locked out?
We strongly advise against it. uPVC frames are rigid but brittle at the corners and around the lock area — applying lever force can crack the frame, shatter the glazed unit, or permanently damage the multipoint keeps in a way that makes the door impossible to secure afterwards. The resulting repairs will cost significantly more than a professional call-out. If you are locked out, first check whether any other door or window has been left unlocked, or whether a spare key is accessible. If not, call 020 3757 5833 and we will send a technician straight away — we are usually with you in about 30 minutes and work damage-free wherever possible.