Patio & French Door Locks
Patio sliders and French doors are a popular feature in Croydon homes — from Victorian terraces in South Norwood to newer builds off the Purley Way — but they come with a specific set of locking challenges that differ sharply from a standard front door. The multipoint locking systems, hook bolts, and euro cylinders found on uPVC patio and French doors are precision components, and when they wear, stiffen, or fail, the door can become impossible to close securely, or leave you locked out of your own garden. Addiscombe Locksmith is a 24/7 mobile service covering the whole Croydon area, and our trained technicians deal with these mechanisms every day.
Open 24 hours, 7 days a week · Fully insured
Whether your French door lever lock has seized, your patio slider will not engage its hooks, or a break-in attempt has damaged the frame and cylinder, we come to you — no shop visit, no waiting days for a part to be ordered. We carry a wide range of replacement multipoint lock cases, euro cylinders, and door handles in our vans so that most repairs and replacements can be completed on the same visit. Call 020 4542 3118 at any time, and we will confirm an exact up-front price before any work begins.
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 Croydon, 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 and French Door Locks Fail — and What We Find in Croydon Homes
[2] uPVC patio sliders and French doors use a long, multi-point lock cassette that runs the full height of the door slab. When you lift the handle, a series of hooks, rollers, and locking points shoot out simultaneously into the frame keep. It is an effective system, but every moving part is subject to wear. The most common faults we attend to across Croydon — from flats near East Croydon station to semi-detached houses in Shirley — are a handle that has to be lifted very hard before the key will turn, a gearbox that has cracked internally, hook bolts that stick out but will not retract, and euro cylinders that have been damaged or worn smooth. Left untreated, a stiff or partially failing multipoint lock will eventually leave the door either stuck shut or unable to latch at all.
Doors that face a garden or a rear passageway are also more likely to have suffered weathering — the uPVC frame expands and contracts through the seasons, which throws the locking points out of alignment with the keeps in the frame. We often find this on properties near Lloyd Park and in the Addiscombe area where older double-glazed installations have never been adjusted. A quick alignment check is always part of our diagnostic before we decide whether a repair or a full lock replacement is the right course of action.
Repairing and Replacing Patio and French Door Locks — What the Work Actually Involves
[3] When we arrive at your property, the first step is to identify the exact lock cassette fitted. uPVC patio and French doors are made by dozens of manufacturers and the cassette dimensions — the backset, the height between fixing holes, the case depth — vary considerably. Our technicians carry a broad stock of multipoint lock bodies to cover the most common formats, including gearbox-driven cassettes and those with separate hook bolt and locking point sections. Where a french door mortise lock set is in use — a scenario more common on older timber-framed French doors — we assess the rebate depth and whether a 5 lever rebated mortice lock for french doors is required to satisfy home insurance conditions, then source the correct part. For uPVC sliders, the cassette itself is usually replaced as a single unit rather than repaired in situ, because the internal components are sealed and cannot be serviced individually.
Euro cylinder replacement is often carried out at the same time. Many Croydon properties still have standard cylinders that are vulnerable to snap attacks — a technique where an intruder snaps the cylinder at a weak point to disengage the cam. We fit anti-snap, anti-pick cylinders that meet TS007 standards, which is what most home insurers now expect on rear doors. If your insurer specifies a particular security rating, let us know when you call and we will bring the appropriate cylinder. All work is carried out damage-free where possible, meaning we always try to avoid cutting or forcing the frame — the goal is a repaired door, not a repair bill that then requires a joiner.
French Door Lever Lock and Handle Options — Getting the Right Fit
A question we hear regularly is how to lock French doors with lever handles effectively when the existing hardware is worn or when a new pair of French doors has been installed without adequate security. The answer depends on the door construction. On modern uPVC French doors, the lever handle is mechanically linked to the multipoint cassette — lifting the handle raises the hooks and the mortice lock french door bolt engages when the key is turned. When this linkage wears, the door can appear locked but the hooks are not fully thrown. We test every locking point with a tension gauge as part of the job, not just check that the key turns. On timber French doors, a french door knob lock or a separate surface-mounted mortice deadlock may be fitted in addition to the main latch, and we can advise on whether the existing arrangement meets a reasonable security standard for a rear elevation.
Handle replacement is a common companion job. French door lever lock handles come in a range of backplate sizes and spindle lengths, and fitting the wrong size handle to a uPVC cassette can put stress on the gearbox and cause premature failure. We match the replacement handle to the existing cassette geometry or, where we are replacing the cassette entirely, select a handle set that is designed to work with the new mechanism. If you are unsure what you currently have, do not worry — our technicians identify everything on arrival. Call 020 4542 3118 and we will send someone out, usually within about 30 minutes of your call.
24 Hour Locksmith Croydon — Emergency Callouts, Lock Changes, and Upvc Door Lock Repair
Addiscombe Locksmith operates around the clock, including evenings, weekends, and bank holidays, because lock failures rarely happen at a convenient time. If you are locked out of your garden room through a failed patio slider at 11pm, or if a French door has been left insecure after an attempted break-in on a Sunday morning, we treat it as an emergency and send a technician straight away. As a 24 hour locksmith Croydon residents can reach at any hour, we aim to be with you in around 30 minutes for most addresses in the CR postcode districts, though travel time can vary. We cover the full Croydon area including Thornton Heath, Selsdon, Coulsdon, New Addington, Purley, and Norbury, and we work across residential and commercial properties alike — so whether you are a homeowner, a tenant, or a letting agent managing a portfolio of properties, we can help.
For upvc door lock repair Croydon callouts, our technicians carry the parts most likely needed based on the fault description you give us on the phone, which keeps the visit efficient. A door lock replacement Croydon job on a patio or French door typically involves removing the old cassette and cylinder, fitting the new components, adjusting the keeps in the frame for correct engagement, and testing the door through its full locking sequence before we leave. Where a lock change Croydon is required following a burglary or a lost key, we also check the door frame and hinges for any damage that could compromise the new lock. We are fully insured, and every technician is trained and experienced in the specific demands of uPVC and timber rear-door systems. For commercial properties — a rear French door on a Croydon high street unit, for example — we also provide the same service, making us a practical choice for any business that needs a commercial door locksmith without waiting days for a contractor.
What Determines the Cost of Patio and French Door Lock Work
We do not quote a price until we understand what the job requires, because patio and French door lock work varies significantly in scope. The factors that shape the final figure include the type of lock cassette needed and whether it is a standard stocked size or a less common format that takes additional sourcing time, the type of cylinder being replaced and its security rating, whether handle sets need to be replaced alongside the lock body, the time of day the callout takes place, and the travel distance to your address within the Croydon area. We confirm the exact price on the phone before anyone leaves for your property, so there are no surprises on completion. If the fault description changes once we inspect the door and additional parts are needed, we tell you and get your agreement before proceeding.
Frequently asked questions
Answers to what our customers ask most. Still unsure? Just call.
My uPVC French doors are locked but the handle feels loose — are they actually secure?+
Not necessarily. On a multipoint system, a loose or worn handle can mean the gearbox inside the cassette has cracked or the spindle connection has failed. The door may appear shut but the hooks might not be fully engaged in the frame keeps. This is a common fault and one that is worth having assessed promptly, because a door that seems locked but is not is a security risk. Call 020 4542 3118 and describe the symptoms — we can usually diagnose the likely cause on the phone before we come out.
How do I know whether my French doors need a repair or a full lock replacement?+
The honest answer is that it depends on which component has failed and how much wear the rest of the cassette has sustained. If only the euro cylinder is damaged, a cylinder replacement is often sufficient. If the multipoint cassette gearbox has cracked, or if the hook bolts are worn and no longer engaging squarely with the keeps, a full cassette replacement is usually more cost-effective than attempting to service sealed internal parts. Our technician will inspect the door on arrival and explain the options clearly before any work begins.
Can you replace a patio or French door lock the same day?+
In most cases, yes. We carry a wide range of multipoint cassettes, euro cylinders, and handle sets in our vans, and the majority of common uPVC patio and French door formats are covered by our stock. For less common cassette sizes, we will advise you on the same visit about sourcing time. We operate 24 hours a day, seven days a week, so same-day attendance — including on evenings, weekends, and bank holidays — is standard for us.
What is a 5 lever rebated mortice lock and when does a French door need one?+
A 5 lever rebated mortice lock for french doors is a mortice deadlock designed for use where the two door leaves overlap — the rebated version allows the lock bolt to clear the rebate step between the active and passive door. Timber French doors fitted in older Croydon properties often use this type of lock, and many home insurers require a five-lever mortice lock that meets BS3621 on accessible rear doors. If you are unsure whether your current lock meets your policy requirements, we can inspect it and advise on whether an upgrade is needed.
What factors affect the price of a patio or French door lock repair or replacement?+
Several things influence the final quote: the type and size of the multipoint cassette required, whether the euro cylinder also needs replacing and to what security specification, whether handles need to be replaced alongside the lock body, the time of day of the callout — evening, weekend, and bank holiday visits have different rates — and your location within the Croydon area. We always confirm the exact price before we begin, so you know the full figure before we start work. There are no hidden additions added after the job is complete.
I am a tenant — can I have my patio door lock replaced without my landlord's permission?+
Generally, tenants in England should obtain their landlord's or letting agent's permission before replacing or upgrading any lock, particularly on external doors. We work with tenants, landlords, and letting agents across Croydon regularly. If you are in a situation where the door is insecure following a break-in or a failed lock and you cannot reach your landlord immediately, call us on 020 4542 3118 and we can discuss the situation with you — in some circumstances a temporary fix can be arranged while landlord approval is sought for a permanent replacement.
Locked out or need a lock fixed? We are on the way.
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020 4542 3118