uPVC door lock support
uPVC Door Lock Repair and Replacement in Lancing
Call with your postcode for a current arrival estimate.
- 24-hour emergency cover
- No call-out charge
- Price agreed before work starts
uPVC Door Not Locking Properly?
L.M.N Locksmiths Lancing repairs and replaces uPVC and composite door locks across Lancing, including failed multipoint mechanisms, worn cylinders and doors that have dropped out of alignment. You probably do not need a new door: most faults are a failed part inside it.
The symptoms we hear about most: the handle lifts but the door will not lock, the handle has gone floppy, or the key turns but the door will not open. There is no call-out charge. Our uPVC door locks page has more on diagnosis and repair.
What Is the uPVC Door Actually Doing?
Each common uPVC symptom tends to lead back to one particular part. That is useful to you, because a clear description over the phone lets us narrow the fault before we arrive and quote more accurately.
When the key will not turn from outside
Sometimes the key is worn; sometimes the euro cylinder is the problem. The key can also resist turning when pressure comes from incorrect door alignment or the internal mechanism. If it stays stiff, resist forcing it, and let the cause be confirmed before any repair or replacement is recommended.
Handle has dropped or feels floppy
Worn fixings or a loose spindle can leave a handle without tension. A droop can also signal a fault inside the gearbox. Choosing the repair needed should follow a combined inspection of the handle and locking mechanism.
The door will not lock, though the handle lifts
The locking points may not be engaging with the keeps as they should. That could indicate the door is out of alignment, or that the multipoint mechanism has a fault. Repeatedly forcing the handle tends to make things worse; door and lock should be looked at together.
The door is locked shut and will not open
Inside, a cylinder or mechanism fault may be preventing the door from opening, and poor alignment can press on the locking points too. A locksmith can inspect the door and settle on an appropriate opening method, which will depend on the fault and the state of the door. The intention is to regain access while limiting avoidable damage, but damage-free entry cannot be guaranteed in every situation.
The key turns but the door will not open
A turning key does not always mean the full locking system is working. Possible locations for the fault may include the cylinder, latch or central gearbox. Strong resistance in the key or handle is a signal to stop, as further force places more strain on the mechanism.
You have to lift and shove it to lock
If the door only locks when you lift hard or push it against the frame, the hooks and keeps have probably drifted apart. The locking points bear additional pressure when alignment is poor in that way.
If you cannot get in at all,.
uPVC Door: The Three Parts That Fail
Three systems sit behind every uPVC door handle: the cylinder, the gearbox with its multipoint strip, and the alignment of the door itself. Each fails differently, and each costs a different amount to put right.
Alignment of the door
Start here, because it is often overlooked. Alignment is separate from the lock, yet it governs how the locking points meet the keeps in the frame. When it slips, the key or handle can become difficult to operate, and an adjustment may be needed even though the lock has not fully failed. Some lock problems are caused or made worse this way, so the price reflects the cause and the adjustments required. Separate work from a door specialist may be necessary to address significant damage or structural faults in the door.
A multipoint gearbox
The gearbox is what turns a lift of the handle or a turn of the key into movement along the multipoint system. If it develops a fault, the door may not lock or unlock correctly. In some cases a replacement gearbox can go in without a new strip, though that depends on compatibility and on the condition of the remaining mechanism. The strip itself runs along the door edge and works hooks, rollers or bolts, depending on the system. It may need replacing in full if several parts are damaged or a compatible gearbox-only repair is not appropriate. A complete strip brings different parts and fitting work, so whether the gearbox can be replaced separately affects the price, as do compatibility and component availability.
Euro cylinder
The part of the lock operated by the key is the cylinder. Although it works with the gearbox, it can often be replaced on its own; in suitable cases the gearbox and full multipoint mechanism stay as they are. Correct sizing and compatibility with both the fitted lock and the protective door hardware must be ensured for any new cylinder. Its price depends on the required size and security rating.
Upgrading the Cylinder Whilst We Are There
Your key goes into the euro cylinder, and that small part is often the easiest to improve. In suitable cases it is replaced without changing the gearbox or full multipoint mechanism, whether because the existing one is damaged, unreliable or incorrectly sized, or because you want to consider a recognised security-rated option. When a cylinder is coming out anyway, we recommend an anti-snap rated replacement; it adds little to the job. If you would rather keep things as they are, a standard cylinder is replaced like for like.
- Recognised security standards form the basis of certification for some cylinders. Options may include TS 007 three-star and SS 312 Diamond-rated cylinders, and you can see whether yours already has a star rating or Diamond mark by looking at its face.
- Security ratings do not make a cylinder right for every door. The correct size matters, and so does compatibility with the existing lock and any protective hardware.
- Read the precise wording if your insurance policy sets out a standard for the lock or cylinder. Some policies specify one, and you can ask your insurer to confirm its requirements before choosing.
Composite Doors as Well
We repair composite door locks alongside uPVC ones. Many composite doors carry euro cylinders and multipoint mechanisms close to those in uPVC, so problems can sit in the key, handle or locking points, or come from poor alignment stopping the mechanism. What changes is the slab, which is denser and harder to work on, and hardware sizing, which varies more; both are assessed before a compatible repair or replacement is recommended.
Usually, You Do Not Need a Whole New Mechanism
Here is the cost insight most people never hear. A failed multipoint usually means a failed gearbox, the central unit, not a failed full-height strip, and if the strip and hooks are in good order the gearbox alone can normally be changed. That is a materially smaller job, and a smaller bill, than replacing everything.
We will tell you plainly when the whole strip does need to go: if it has been physically damaged by a forced entry, if it is corroded, or if the system is obsolete and its gearbox is no longer manufactured. More on that choice is on our lock replacement page.
And You Almost Certainly Do Not Need a New Door
The double glazing company that fitted your door is a natural first call, but it is the wrong one for most lock faults. They fit doors; locksmiths fix locks. A failed gearbox, worn cylinder or dropped door costs a fraction of a new door to put right. In some cases just one part of the uPVC system needs attention, and the option chosen depends on the fault plus the compatibility and condition of everything else in the mechanism. Often the central gearbox is the only part stopping the lock, and sometimes a compatible gearbox can be fitted without the complete multipoint strip being changed, subject to the gearbox model and the condition of the remaining components. Where several components are worn or damaged, or the strip has failed and no suitable gearbox-only option exists, the complete strip may need replacing, and any replacement mechanism has to be compatible with the door and its locking arrangement. Occasionally it is the door that prevents the lock working correctly. We can assess how its condition affects locking; severe warping or damage to the profile may require more than an adjustment or a replacement component, and wider structural repairs may require a suitable door specialist. In every case we assess the complete locking operation before recommending the work required.
Locksmith pricing
How the Job Works
- Get a price. We identify the likely fault from what you describe and give you a price.
- Repair and test. The repair is completed and the door is tested locking and unlocking from both sides, with the alignment checked.
What affects the cost?
Service required, time of attendance, lock and door type, labour and parts.
Locksmith pricing
What Does It Cost to Repair a uPVC Door Lock?
Every uPVC lock fault is priced on its own merits; no one fixed figure covers them all. What you pay follows the fault, the parts it needs and the work required, which may be an adjustment, a repair or a replacement component. A cylinder replacement costs differently from gearbox work or a complete mechanism, and door alignment can change the repair needed. Five factors decide the figure:
- The part that has failed.
- Whether a gearbox on its own will do, or the full strip is needed.
- Whether you upgrade the cylinder.
- Whether the door needs realigning too.
- The time of day.
Broadly, the cylinder is the least expensive outcome, a gearbox-only repair comes next, and replacing the whole mechanism costs most. We cover uPVC and compatible composite doors, assess both lock and alignment, and explain the repair and replacement options. You will not pay a call-out charge, and the price is given on the call. Describe what the key and handle do, and whether the door opens, closes and locks normally, and we will price the work from that description during the call. On site, inspection identifies the fault and whether it calls for adjustment, repair or a compatible replacement part. Your phone price stands unless the job on site turns out different; you hear about any change before work starts and approve the work before we begin. After we complete the approved work, the key, handle and locking are tested, along with alignment and locking-point engagement where relevant. You pay for the work carried out, any parts needed, and VAT, and that covers it. Rates outside Monday to Friday, 7am to 6pm, are higher, but the call-out itself is never charged, even late at night.
What affects the cost?
Service required, time of attendance, lock and door type, labour and parts.
uPVC Door Lock Repairs Across Lancing
We repair uPVC and composite door locks for homeowners, landlords and businesses across Lancing, and the age of the local housing shows why this matters.
The numbers explain why. In Lancing 48.5% of homes date from 1945 to 1982, 11.4% from 1983 to 2008 and 5.9% from 2009 onwards, against 32.4% from 1900 to 1939 and 1.8% from before 1900 (VOA council tax property stock, 31 March 2026). Homes of that age have often had their original doors swapped for uPVC or composite ones, which is an inference about the stock rather than a count of doors, and the technician confirms what is fitted. North Lancing is mostly houses (Census 2021, ONS), where a single multipoint door is the usual job.
We work in North Lancing, South Lancing and Lower Cokeham, every postcode in BN15, the parts of BN43 around Lancing and in Sompting, which has its own page. The area had around 23,000 usual residents at the 2021 Census (ONS, output areas approximated to the built-up area).
See all areas we cover.
Emergency and planned locksmith services
Call L.M.N Locksmiths Lancing
A uPVC door that will not lock is a security problem tonight, so ring 01903 377061 and it is dealt with as urgent; a stiff handle can be booked for a weekday, 7am to 6pm. There is no call-out charge, the price is agreed before work, and a clear photograph of the lock and handle sent in can help us diagnose the fault.
- Phone: 01903 377061
01903 377061
Frequently Asked Questions
My uPVC door handle has dropped and will not lift. What is wrong?
By far the likeliest culprit is the multipoint gearbox, though we always confirm it first. An internal failure leaves the handle with no engagement, so it drops and will not lift. Expect the door to possibly stay locked, because the hooks and bolts can remain engaged. As common uPVC faults go, this one is usually repairable without a whole new mechanism or door.
Do I need a whole new mechanism or just the gearbox?
The gearbox, in the large majority of cases. Most uPVC lock failures sit inside that central unit, not along the full-height strip, so if the strip and hooks are sound only the gearbox needs replacing. Physical damage, corrosion and obsolete systems with no gearbox still made are the usual reasons a full mechanism is needed instead.
Does a broken uPVC lock mean I need a new door?
Almost never. A failed gearbox, a worn cylinder or a door that has dropped on its hinges are lock and hardware faults, not door faults. A locksmith can put all three right at a fraction of the cost of a replacement door. It is worth having the lock looked at before you price a new door with a window company.
Why do I have to lift and shove the handle to lock my door?
It is almost always alignment. When a door drops or its frame moves, the locking hooks stop meeting the keeps cleanly, so you have to lift and shove to line them up. The lock itself may be fine at that stage. Every forced lift loads the gearbox, however, and that is how gearboxes eventually break, so adjusting the door early saves money.
How long does a uPVC lock repair take?
It varies with the repair. An alignment adjustment varies according to how far the door has dropped or moved. We give you the likely duration at the same time as the price.
How long should a uPVC door lock last?
There is no set answer for doors in Lancing or anywhere else. Lock life depends on how heavily the door is used and whether its alignment has been correct. A door that has been out of alignment for years will wear its mechanism out considerably faster than one that closes cleanly, so keeping it adjusted is the best way to make the gearbox last.
Can you get me in if the door is locked shut and will not open?
Usually, yes. When a uPVC door is stuck locked, the cause is normally a seized gearbox or a jammed hook, not the cylinder. Our approach is to release the mechanism rather than damage the door, although no one can guarantee damage-free entry in every case. Call us before you force it: forcing a jammed multipoint can turn a gearbox repair into a whole new mechanism.
Should I use WD40 on a stiff uPVC lock?
We would not recommend it as a lubricant. WD40 is a water displacer and cleaner, not something that lubricates for long, and it can attract dirt into the mechanism over time. Graphite or silicone, applied dry, does the job better. A handle that stays stiff after lubricating usually points to alignment or a wearing gearbox and should be checked before it fails.
Still have a question or need urgent assistance? Call 01903 377061, tell us what has happened and receive a current arrival estimate.