uPVC door lock support
uPVC Door Lock Repair and Replacement in Boston
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?
Big Locksmiths Boston repairs and replaces uPVC and composite door locks, 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 people describe are a handle that lifts but the door will not lock, a handle that has gone floppy, and a key that turns without the door opening. There is no call-out charge.
What Is Your uPVC Door Doing?
Six symptoms account for most uPVC lock problems, and each one points somewhere specific. Matching yours to the list below helps us identify the probable fault before arrival and give you a sharper price when you ring.
The handle has dropped or is floppy
Fixings or a loose spindle can make a handle lose its tension. A floppy handle can also be the first sign of a fault inside the gearbox. For that reason, deciding on the repair needed follows a combined check of the handle and locking mechanism.
The handle lifts but the door will not lock
If the door will not lock with the handle raised, the locking points may not be meeting the keeps correctly. Either incorrect door alignment or a fault inside the multipoint mechanism may explain it. Avoid repeatedly forcing the handle; inspect door and lock together.
You have to lift and shove to get it to lock
A door that needs a hard lift or a shove to lock has normally moved out of line with its frame. The locking points come under additional pressure when the alignment is poor in this way.
The key will not turn from the outside
The key may be worn or the euro cylinder may be at fault. Poor door alignment, or pressure from the internal mechanism, can also make turning difficult. If the lock stays stiff, do not force the key; the cause should be confirmed before a repair or replacement is recommended.
The door will not open though the key turns
Even with a turning key, the complete locking system may not be working. The cylinder, latch and central gearbox are all possible locations for the fault. Stop if you meet strong resistance at the key or handle, because further force could strain the mechanism more.
When the door is locked shut and will not open at all
A fault in the cylinder or the internal mechanism may prevent the door from opening, and poor alignment can add pressure to the locking points. The fault and the state of the door will determine which opening method is used. A locksmith can inspect the door and pick an appropriate method intended to limit avoidable damage and regain access; damage-free entry cannot be guaranteed in every situation.
If that last one is you, our emergency locksmith service is the place to start.
The Three Parts of a uPVC Door That Fail
Behind the handle of a uPVC door sit three separate systems, not one lock. Pinpointing the failing system first is what keeps a quote honest, because the costs of fixing each are far apart.
The euro cylinder. This is the key-operated part. It operates in partnership with the central gearbox, yet in suitable cases it can be replaced by itself, without changing the gearbox or the complete multipoint mechanism. The fitted lock and the door's protective hardware must be compatible with the replacement, which must also be correctly sized. Cylinder prices reflect the size required and the security rating.
The gearbox and multipoint strip. The gearbox carries movement from the key and handle through to the multipoint system, and a fault in it can stop the door locking or unlocking correctly. In some cases a gearbox can be fitted without changing the complete strip; that depends on compatibility and the condition of the remaining mechanism. The strip runs along the door's edge and, depending on the system, works hooks, rollers or bolts. Where several parts are damaged, or a compatible gearbox-only repair is not suitable, the complete strip may need replacing. The price depends on whether the gearbox can be replaced separately, since a complete strip involves different parts and fitting work, and on compatibility and component availability.
The door alignment. Alignment is distinct from the lock, but it controls how the locking points meet the keeps in the frame. Poor alignment can make the key or handle difficult to operate, and the door may need adjustment even if the locking mechanism has not completely failed. Where alignment has caused a lock problem, or made one worse, what you pay depends on that cause and on how much adjustment is required. Where significant damage or structural problems affect the door, separate work by a door specialist may be needed.
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.
While We Are There, Upgrading the Cylinder
Should you upgrade the cylinder while it is out? We think it is worth considering, because the extra work involved is small, but it is a recommendation and never a condition; a standard cylinder can be replaced like for like. The euro cylinder is the key-operated part of the lock, and in suitable cases it can be replaced without changing the gearbox or the complete multipoint mechanism. Reasons to replace include damage, unreliability or incorrect sizing, and some customers do so to consider a recognised security-rated option.
Look at your cylinder face
for a star rating or Diamond mark. Some replacement cylinders are certified to recognised security standards, and options may include TS 007 three-star and SS 312 Diamond-rated cylinders.
A rating is not a fit.
No security rating makes a cylinder suitable for every door. Both its size and its compatibility with the installed lock and surrounding protective hardware must be correct.
Check your policy.
Some policies specify a lock or cylinder standard; check the exact wording, or ask your insurer to confirm its requirements before choosing.
For background, see anti-snap locks and lock snapping explained.
You Almost Certainly Do Not Need a New Door
Locksmiths fix locks; window companies fit doors. Keep that in mind when a uPVC door stops locking, because the fault is usually a failed gearbox, a worn cylinder or a dropped door, and every one of those is a hardware repair costing a fraction of a new door.
It is common for only one part of the locking system to need attention, with the appropriate option depending on the fault and on the compatibility and condition of the remaining mechanism. If the central gearbox is the only part stopping the lock, a compatible one can sometimes be fitted without changing the complete strip, though that depends on the model and the condition of the remaining components. The complete strip may need replacing when several components are worn or damaged, or when it has failed and no suitable gearbox-only option is available, and the replacement must be compatible with the door and its locking arrangement. Now and then the door itself is what stops the lock working correctly, and we can assess how its condition is affecting the locking. Severe warping or damage to the profile may require more than an adjustment or a replacement part, and wider structural repairs may need a suitable door specialist. Nothing is recommended until we have assessed the complete locking operation. More on lock repair.
Composite Doors Also
If your door is composite, the same help applies, because we cover both. Many composite doors use euro cylinders and multipoint mechanisms similar to uPVC, meaning a fault can affect the key, handle or locking points, and poor alignment can stop the mechanism from working correctly. The denser slab is harder to work on and hardware sizing varies more, so door construction and fitted hardware are assessed before a compatible repair or replacement is put forward.
Locksmith pricing
How a Job Works
Here is how a uPVC lock job runs:
- We tell you the most likely fault along with a price.
- We complete the repair and test the door from both sides, locking and unlocking, with alignment checked.
What affects the cost?
Service required, time of attendance, lock and door type, labour and parts.
Locksmith pricing
How Much Does a uPVC Door Lock Repair Cost?
Four outcomes, very different costs. A cylinder swap is usually the cheapest result, a gearbox-only repair costs more, and a complete mechanism replacement costs the most, which is why there is no single fixed price for every uPVC door lock repair. The cost depends on the fault, any replacement parts and the work required, and the fix may be an adjustment, a repair or a replacement component. The repair required can also depend on how the door is aligned.
What moves the price - the failed part - gearbox only, or the complete strip - an optional cylinder upgrade - realigning the door - the time of day
Our work covers uPVC and compatible composite doors: lock and door alignment assessed, repair and replacement options explained. There is no call-out charge, and we give you a price on the call. Tell us how the key and handle behave and whether the door opens, closes and locks normally; we use your description to give you the price during that call. Inspection identifies the fault and whether it requires adjustment, repair or a compatible replacement part. That phone price stays unless the job differs on site; any change is explained before work begins, and you approve the work first. We then carry out the approved work, test the key, handle and locking, and check door alignment and locking-point engagement where relevant. You pay for the work carried out, any parts needed, and VAT, nothing on top. Rates outside Monday to Friday, 7am to 6pm, are higher, but the call-out itself is never charged, so a visit is never billed just for turning up.
What affects the cost?
Service required, time of attendance, lock and door type, labour and parts.
uPVC Door Lock Repairs Across Boston
We repair uPVC and composite door locks for homeowners, landlords and businesses across Boston.
Housing in Boston is a mix of old and new. About a third of homes date from 1983 or later, 19.9% from 1983 to 2008 and 13.6% from 2009 on, against 35.5% from 1945 to 1982 (VOA council tax property stock, 31 March 2026), so later doors with multipoint mechanisms are part of everyday work here. Calls come from Wyberton, Haven Village, Staniland, Skirbeck, Trinity and Bargate, and from every postcode in PE21 and the parts of PE20 around Boston.
See all areas we cover, or read more about uPVC door locks.
Emergency and planned locksmith services
Call Big Locksmiths Boston
A door that will not lock is a security problem tonight, while a stiff handle can wait for a booked weekday visit. There is no call-out charge, the price is agreed before work starts, and a fault can often be diagnosed from your description or a photo.
- Phone: 01205 601044
01205 601044
Frequently Asked Questions
My uPVC door handle has dropped and will not lift. What is wrong?
In most cases, a failed gearbox. The handle relies on the gearbox for its tension, so when the internals give way it hangs down and will not lift. Do not assume the door is unlocked: the hooks and bolts can still be engaged. Because this is such a common fault, it is usually fixed by repair rather than by replacing the full mechanism or the door.
Do I need a whole new mechanism or just the gearbox?
Normally the gearbox only. We check the full-height strip and hooks first; if they are sound, replacing the central gearbox on its own is usually all that is needed, since that is where the failure tends to be. A full mechanism makes sense after physical damage or corrosion, or where the system is obsolete and its gearbox is no longer produced.
Does a broken uPVC lock mean I need a new door?
Almost never, so do not start pricing doors yet. A failed gearbox, worn cylinder or dropped door is a fault in the lock or hardware, and a locksmith can repair any of them for a fraction of the cost of a new door. Severe warping or structural damage is the exception, and an inspection will tell you if that applies.
Why do I have to lift and shove the handle to lock my door?
The hooks are no longer lining up with the keeps, usually because the door has dropped on its hinges or the frame has moved. It starts as an alignment issue, not a lock fault. Keep forcing it, though, and the gearbox takes the strain until it fails, which is why getting the alignment adjusted early is the far cheaper option.
How long does a uPVC lock repair take?
It depends on the part. An alignment adjustment varies with how far the door has moved. We confirm the likely job length when we give you the price.
How long should a uPVC door lock last?
There is no set answer for doors in Boston 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?
Generally, yes. The usual cause is a seized gearbox or jammed hook, not the cylinder, and the method depends on the fault and the door's condition; we aim to release the mechanism and limit avoidable damage, although damage-free entry cannot be guaranteed in every case. Please call before you put your shoulder to it, as forcing a jammed multipoint can mean replacing the full mechanism.
Should I use WD40 on a stiff uPVC lock?
Not as a lubricant. WD40 is a cleaner and water displacer rather than a lasting lubricant, and over time it can attract dirt into the mechanism. A dry graphite or silicone lubricant is the better choice. If the handle is still stiff after lubricating, the cause is usually alignment or a wearing gearbox, and it is worth getting checked before it fails completely.
Still have a question or need urgent assistance? Call 01205 601044, tell us what has happened and receive a current arrival estimate.