Patio & French Door Locks
Patio sliders and French doors are a staple of Kentish Town homes — from the Victorian terraces off Leighton Road to the garden-flat conversions along Grafton Road, these doors let light into rooms that would otherwise feel closed in. But the multipoint locking systems and euro cylinders built into uPVC patio and French door frames are not the same hardware you find on a solid timber front door, and when they fail, the fix is rarely as simple as a quick turn of a screwdriver. Kentish Town Locksmiths is a fully insured, mobile locksmith service operating 24/7 across the NW5 area and surrounding streets, and our trained technicians work specifically with this type of door hardware every day.
Open 24 hours, 7 days a week · Fully insured
Whether you have noticed your patio slider becoming stiff to lock, found that your French door lever handle no longer engages the multipoint mechanism properly, or simply arrived home to a door that will not secure at all, this page explains what is usually wrong, how we fix it, and what determines the cost of the work. We come to you — no need to remove any hardware and bring it elsewhere. Call us on 020 7871 7825 and we can usually have a technician with you in around 30 minutes.
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 Kentish Town, 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 Do About It
The locking mechanism inside a uPVC patio slider or a French door frame is usually a multipoint lock: a strip of steel running the height of the door sash that shoots multiple hooks, bolts, and rollers into the frame when you lift the handle and turn the key. Over time, the door sash drops slightly as the hinges wear or the uPVC frame settles. When that happens, the hooks no longer align cleanly with their keeps in the frame, so the handle feels stiff, the key becomes hard to turn, or one of the locking points stops engaging entirely. Left too long, the gearbox inside the mechanism strips its teeth and the whole lock strip needs replacing rather than just re-aligning the door.
French doors add a layer of complication because there are two independently moving sashes. The inactive leaf is usually held at top and bottom by flush bolts or espagnolette bolts, while the active leaf carries the main multipoint lock. A French door mortise lock or a rebated mortice lock set is sometimes fitted instead of a full-length multipoint strip — particularly on older timber-framed French doors that have been re-fitted into uPVC surrounds. When a 5 lever rebated mortice lock for French doors fails, the rebated faceplate (which accommodates the slight overlap between the two door leaves) is a specialised part, and fitting a standard mortice deadlock in its place simply will not work. Our technicians carry a range of rebated and standard French door lock sets and can identify the correct replacement on site.
Patio Slider Lock Repair and uPVC Door Lock Replacement London
Patio sliders present their own set of issues. The sash runs on a bottom track and is lifted slightly to engage the multipoint hooks — if the track is dirty, bent, or if the anti-lift blocks have worked loose, the door either will not lift properly or lifts unevenly, putting the hooks out of line with the keeps. We start with the simplest fix: track cleaning, roller adjustment, and keep repositioning. If the gearbox has failed, we replace the multipoint mechanism with a compatible unit, taking care to match the hook spacing (the distance between each locking point) and the backset of the cylinder so that the existing handles and euro cylinder can be reused where possible. Where the euro cylinder itself has been damaged — either through attempted forced entry or through the cylinder-snapping technique that is unfortunately common on uPVC doors across London — we fit an anti-snap, anti-pick replacement as a matter of course.
For residents in Kentish Town who are locked out because a patio or French door will not open from inside or outside, we approach the situation with non-destructive methods wherever the door condition allows. If the mechanism has simply jammed rather than been deliberately forced, there is usually a way to release it without damaging the frame or the glass units. We will always confirm an exact, up-front price before any work begins — the final quote depends on the type of lock involved, the parts needed, the time of day, and travel distance to your address. We do not begin work until you have agreed to that figure. If you are dealing with a lockout right now, call 020 7871 7825 — we answer 24/7, including evenings, weekends, and bank holidays.
French Door Lever Locks, Knob Sets, and Mortise Hardware — What We Fit
Not every French door uses a full-length multipoint strip. Period conversions in Kentish Town often retain timber French door frames with a traditional mortise lock at mid-rail height, supplemented by manual surface bolts at the top and bottom of the passive leaf. A French door mortise lock set in this configuration typically uses a rebated faceplate so that the two door faces interlock cleanly without a gap. When one of these locks fails — usually because the case corrodes internally, the lever follower shears, or the bolt itself becomes difficult to throw — we remove the old lock case, check the mortise pocket dimensions, and fit a replacement that matches the lever count and BS standard of the original. For insurance purposes, many Kentish Town letting agents and landlords specify that French doors should carry a lock that meets or exceeds BS3621, and we can advise on which options satisfy that requirement without altering the door aesthetics.
Some French doors — particularly those fitted in ground-floor garden flats — have a French door knob lock or a French door lever lock fitted to a narrow-style backplate, sometimes with a separate euro cylinder below the handle. These are common on doors installed in the late 1990s and early 2000s, when the handle-integrated cylinder format became popular. The challenge is that manufacturers change their product lines regularly, so an exact like-for-like replacement is not always available. Our technicians are experienced in cross-referencing fixing-hole centres, backset measurements, and spindle diameters to find a compatible replacement that fits without widening the existing holes or requiring filler. Knowing how to lock French doors with lever handles correctly — specifically, that you must lift the handle fully before turning the key to engage all multipoint hooks — is something we explain to every customer after a repair, because incorrect use is a leading cause of premature mechanism wear.
Security Upgrades and When to Consider a Full Door Lock Replacement London
A repair is the right call when the door and frame are sound and the mechanism failure is isolated. A full door lock replacement London is the better choice when the existing hardware is obsolete, when the door has been compromised during a break-in, or when the security standard of the fitted lock is simply too low for the exposure level of the door. Patio doors and ground-floor French doors are statistically among the more targeted entry points in residential break-ins across north London, so it is worth taking the opportunity of any service visit to review the whole door setup. We can fit anti-lift blocks and security keeps to patio sliders, fit a secondary London bar or patio lock at the top of the frame, and upgrade the euro cylinder to a TS007 3-star anti-snap unit on any uPVC French door. Where a French door has a traditional mortise lock, we can assess whether a 5 lever rebated mortice lock for French doors meets current insurance standards and advise accordingly — without any pressure to replace parts that are still performing adequately.
For landlords, managing agents, and housing associations in the Kentish Town area who need lock repairs or replacements across a small portfolio of flats — including the blocks of flats found around Kentish Town Road and Prince of Wales Road — we are well placed to help. Our service is mobile, so we work around tenant access and do not require a property to be vacant. We are fully insured for work in occupied and rented properties, and our technicians are experienced in liaising with both tenants and letting agents. If you manage several properties and need a locksmith London you can call back consistently, we are the team to contact. Reach us any time on 020 7871 7825 — we are always available, day or night.
What Determines the Cost of Patio and French Door Lock Repairs
We are frequently asked what a repair or replacement will cost before a technician visits. The honest answer is that pricing depends on a small number of clear factors: the type of lock mechanism involved (a standard multipoint strip costs differently from a rebated French door mortise lock set), the parts required and whether they are common stock or a less available specification, the time of day (evening, weekend, and bank holiday call-outs reflect the hours worked), and the travel distance to your address. All of these are taken into account when we give you a quote over the phone. That quote is confirmed as an exact figure before the technician begins any work — there are no additions afterwards unless the scope changes and you agree to it first.
What we will never do is start work and then reveal a higher figure once the door is already open. If a repair turns out to be more involved than the initial assessment suggested — for example, if a seized mechanism reveals corroded keeps that also need replacing — we stop, explain what we have found, give a revised figure, and proceed only with your agreement. That approach has built our reputation across Kentish Town and the surrounding NW5 streets, and it is simply how we operate on every job, from a straightforward gearbox swap to a full French door lock replacement.
Frequently asked questions
Answers to what our customers ask most. Still unsure? Just call.
My patio door handle lifts but the key will not turn — is the lock broken?+
Not necessarily. The most common cause is that the door sash has dropped slightly, so the hooks and rollers are pressing hard against the frame keeps rather than sitting cleanly opposite them. When that happens, the mechanism is under tension and the key cannot turn the cylinder. Try lifting the handle as firmly as you can while a second person gently pushes the door into the frame at mid-height, then try the key again. If it turns, the door needs re-alignment rather than a new lock. If it still will not turn, the gearbox may have stripped or the cylinder may be damaged, in which case call us on 020 7871 7825 and we will diagnose the problem on site.
How do I correctly lock French doors with lever handles?+
On a uPVC or aluminium French door fitted with a multipoint mechanism, the correct sequence is: close both door leaves fully with the passive leaf secured at top and bottom first, then lift the active leaf handle upward as far as it goes — this drives all the hooks and bolts into their keeps — and then turn the key. If you do not lift the handle before turning the key, only the latch engages, not the full multipoint system, and the door is not properly locked. Many people skip the lift because the key turns either way, but the door is significantly less secure when the hooks are not engaged. If your lever handle no longer lifts smoothly or feels loose, the gearbox inside the mechanism is likely wearing and should be looked at before it fails completely.
What is a rebated mortice lock and do I need one for my French doors?+
A rebated mortice lock has a faceplate that is stepped or angled to follow the overlapping rebate where two French door leaves meet. Because the active and passive leaves overlap slightly, a standard flat-faced mortice lock cannot sit flush in the door edge — the rebated version accommodates that step. If your French doors have a traditional mortice lock at mid-rail height rather than a full-length multipoint strip, the chances are it is a rebated type. Replacing it with a standard mortice lock will leave a gap at the faceplate and may prevent the bolt from throwing cleanly. Our technicians carry rebated lock cases and can confirm on the doorstep whether your doors require this type, including 5 lever versions that meet BS3621 for insurance purposes.
Can you repair a French or patio door lock without damaging the door or the glass?+
In most cases, yes. The majority of uPVC patio and French door lock failures are mechanical — a worn gearbox, a misaligned keep, a faulty cylinder — and all of those can be addressed by working through the existing lock apertures without touching the glass units or the frame seals. The only time damage to the door becomes a realistic risk is when the door has been forcibly attacked and the frame or sash is already bent, or when a jammed mechanism has to be overcome to open a door that cannot be accessed any other way. Even then, we always explore the least destructive option first. We will explain the approach and the risk before we start, and you confirm the go-ahead.
How quickly can you reach me in Kentish Town for an emergency lock repair?+
We send a technician straight away when you call, and we are usually with you in around 30 minutes. Kentish Town is our local area — we know the streets around Kentish Town Road, Fortress Road, and the residential roads off Prince of Wales Road well, and we are not navigating unfamiliar territory when we come to you. We cannot promise an exact arrival time because traffic and ongoing jobs vary, but we will give you an honest estimate when you call and keep you updated. Ring us on 020 7871 7825 any time — 24 hours a day, seven days a week, including bank holidays.
What factors affect the price of a patio or French door lock repair?+
The price we quote is based on four things: the type of lock involved (a multipoint gearbox, a rebated mortice lock set, and a euro cylinder all differ in parts cost and fitting time), the specific parts required and their availability, the time of day your call comes in (evening, weekend, and bank holiday work reflects the hours our technicians are putting in), and the travel distance to your address. We confirm an exact price with you over the phone before anyone sets off, and again on the doorstep before any work begins. There are no additions unless the scope of work changes and you agree. We do not use bargain language or make claims about being the least costly option — we focus on giving you a fair, transparent figure and doing the job properly.
Locked out or need a lock fixed? We are on the way.
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020 7871 7825