UPVC door specialist and advice? We can help
July 30, 2025
UPVC door locks (often called plastic doors) can be frustrating for a homeowner. We aim to take out all the frustration of owning a UPVC door and providing all services related to UPVC door locks and mechanisms.
First, we will briefly explain what a UPVC door lock consits of. Then we will go through the most common faults our UPVC lock specialists come across, how we repair UPVC locks and a UPVC door lock price guide.
1. A multi-point locking mechanism
- This is normally a strip down the edge of the door with a few cases that sit inside the door itself and bolts that come out the door and go into the frame.
2. A cylinder
- This normally sits inside the door and is accessed with the key from the outside and inside (sometimes only the outside is operated by a key as a knob is used on the inside for fire safety) and a screw on the edge of the door.
3. A handle set
- These sit on each side of the door and are used to operate the latch and the locking mechanism/ bolts.
4. Hinges
- These are often overlooked and are an important component of a UPVC Door. When adjusted correctly they can ensure that your door will last a lot longer as it won't be dropping so rapidly.
UPVC Door with incorrect size euro fitted
Now we have gone through the components of a UPVC door we will go through a few common issues our UPVC door locksmith comes across.
UPVC Door Won’t lock/ shut - I cant lift the handle and turn the Key
Both of these issues are usually caused by one of two reasons
1. The door is out of alignment. Yes seems simple but in hot and cold weather the plastic shifts resulting in dropping doors. This throws the bolts and latch out of alignment also resulting in additional wear and tear on the mechanism inside the door.
2. The door trim rubber has moved & is not sitting properly stopping the door from shutting correctly. If you have recently installed draft excluders, remove them as well. UPVC doors when installed and maintained correctly offer amazing draft exclusion.
Keys goes in lock & turns but won’t open
UPVC/Composite Door
If the key goes into the lock smoothly and turns, but the handles won't go down and the door won’t open, this usually means the multi-point lock has failed or a security bolt or hook has jammed. In these situations you will either have to use another door or call an Emergency UPVC locksmith.
Why won't my key turn in my UPVC door lock?
The top reasons your UPVC door won't unlock are:
1. UPVC Multipoint lock may need repairing or replacing
2. Door and frame not fitting correctly or are out of alignment
3. The handles have been forced up to lock and the delicate mechanism has broken
4. General wear and tear
The best solution for these issues are, in order:
- Replace your mechanism. They are often supplied welded or riveted shut and opening one up will cause you more problems than solutions. Best to call a UPVC door lock specialist.
- This can usually be solved with a UPVC door realignment. This can be done yourself by tightening the alan key screws in the hinges. Which ones to tighten and whihc ones to loosen depends on the door and hinges in question. Again, probably best to call a UPVC door locksmith who will be able to adjust and service your UPVC door giving it many more years of service.
- Once the mechanism is broken, whether in the open position or locked position - it's best to call a UPVC door locksmith. They will be able to diagnose which part of the mechanism is broken, open your door and replace the parts that need replacing. UPVC door mechanisms come in many shapes, sizes and forms - for this its best to call a mobile UPVC door locksmith.
- This can usually be solved with a simple UPVC door home service. We advise washing the mechanism in a liquid lubricant without opening it, once dried go ahead and fill it up with a silicone based lubricant. This will ensure all the small gears and moving parts inside the mechanism run smoothly against each other. Liquid lubricant is not enough! Tighten the screws (not too tight) along the edge of the door and make sure all locking points line up correctly visually.
How we can help you with your UPVC door lock problems.
There are a number of reasons why your UPVC Door or Window lock will need repairing if it is broken or damaged, you will either be able to fix the faulty lock or you might need a lock replacement.
Contact your nearest locksmith who can help advise you on the best solution.
The most common locks to be repaired are UPVC locks on door and windows, which are found on your domestic home front & back doors, they can also be found on French and patio doors.
- Plastic Door or window will not lock
- The UPVC lock is jammed/stuck
- Key will not fully turn in the cylinder
- Key goes in the lock but will not turn
- UPVC Door won’t shut close
Our UPVC Locksmith can repair or replace many different types of UPVC locking mechanisms usually on site.
UPVC locking mechanisms have evolved over time with the security levels offered originating with the latch and roller style mechanism’s and now usually latch, deadbolt and hook variants on offer from most high-security upvc/composite door sets and brands.
We can also upgrade out of date MultiPoint locking mechanisms.
Our locksmiths can also usually upgrade any out of date UPVC multi-point locking mechanisms for the higher security, hook and bolt style higher security locking units. There are a lot of obsolete brands from overseas who no longer manufacture those specific models. This means the door and frame need to be adjusted, another job or locksmiths are expert at.
UPVC Locksmith price guide
Gain access broken UPVC door - From £75 - £145 depending on level of damage internally.
UPVC mechanism or cylinder replacement labour - From £69 to £89
UPVC door cylinders -
Basic - from £30
Mid range - from £55
High security versions - from £95 (British standard home insurane compliant)
UPVC locking mechanisms - from £130 to £280 (UK made mechanisms are usually less expensive, Winkhaus and other overseas mechanisms can reach £350+)
If you're in need of any UPVC door advice, or are in need of a reliable UPVC door locksmith - we can help, just click here to call us now.
If you are looking for a lock change locksmith, you have come to the right place When someone searches for lock change locksmith, they’re seeking more than just a service—they want a trusted partner to keep their property safe. At SMS Locksmiths, we understand that replacing or upgrading locks is about security, peace of mind, and protection for your home or business. With years of experience serving London and the surrounding areas, our team of fully trained, DBS-checked locksmiths delivers reliable, professional lock change services every time. In this comprehensive guide, we cover everything you should know about changing locks—from why it matters and when to do it, to choosing the right locks and understanding the advantages of using professionals. By the end, you’ll know why SMS Locksmiths should be your first call for all lock and security upgrade needs. 1. Why Change Your Locks? Changing locks is about more than just replacing hardware. It’s a critical step in ensuring your property remains secure, especially when key control is uncertain. Here’s why professional lock changes are important: Unknown key holders: If previous occupants, tenants, or staff may still have keys, changing locks ensures only authorised persons have access. Wear and tear: Over time, locks can become loose or malfunctioning, making them less secure. Enhanced security measures: Upgrading to high-security or anti-snap locks can significantly reduce the risk of break-ins. Insurance compliance: Policies often require insurance-approved locks. A professional locksmith can recommend and install compliant hardware. 2. When You Need a Lock Change Here are common scenarios that warrant immediate lock replacement: Moving into a new property Keys lost, stolen, or unaccounted for After tenant departure or staff changes Following a burglary or break-in For security upgrades, including anti-snap or smart locks When locks show signs of wear or are difficult to operate 3. Lock Change vs. Lock Repair Knowing whether to repair or replace your lock is essential: Repair: Ideal if mechanisms are clogged or key entry is limited. Works best for wear-and-tear issues, and can be done quickly. Replace (Lock Change): Necessary if the lock is broken, non-operational, or security needs to be improved. Recommended for move-ins or post-burglary situations. At SMS Locksmiths, we assess and recommend the best option for both security and cost efficiency. 4. Types of Locks and Upgrades We specialise in a range of lock types suitable for different door types, usage scenarios, and levels of security: Lock Type Features & Benefit Whether your priority is keyless convenience, insurance compliance, or maximum protection, we have the right solution. Anti-Snap Cylinder Locks British Standard (BS3621) Deadlocks Multipoint Locking Systems High-Security Cylinder Locks Emergency Locks & Night Latches Smart/Keyless Entry Systems Security Hardware for Doors/Frames Window & Patio Door Locks Prevents forced entry commonly seen in burglaries. Insurance-approved, durable locks for wooden doors. Adds multiple locking points for uPVC or composite doors. Designed to resist drilling, picking, and bumping. Provides quick access control and additional security. Convenient, code-based access without traditional keys. Reinforced plates, hinges, and strike plates to prevent kick-ins. Secures all exterior openings—essential for full-property protection. 5. Our Lock Change Process Here’s how SMS Locksmiths ensures a smooth, fast, and secure lock change: 1. Initial Contact You provide details such as postcode, lock type, and availability. 2. Local Locksmith Assignment A professional locksmith from our London team is dispatched—no call-out fee. 3. Security Assessment on Arrival We check the door, frame, and current lock to determine the best solution. 4. Clear Quotation You receive a written, all-inclusive quote by text or email—no hidden fees. 5. Lock Change or Upgrade We install the replacement lock or upgrade components (cylinders, multipoint mechanisms) efficiently—most jobs are completed in under an hour. 6. Testing & Warranty Final checks ensure the lock operates smoothly. All work is covered by our workmanship warantee. 7. Documentation Provided You receive an invoice and insurance-compliant paperwork for your records. 8. Security Assessment and Upgrade Advice Our expert locksmiths don’t just change locks—they provide strategic advice to strengthen your security: Door frame reinforcement with metal strike plates Window and patio door upgrades with Yale or mortice locks Frame lining solutions to prevent drilling Home security risk assessments to identify weak points 9. Frequently Asked Questions Q. How much does a lock change cost? A. Usually between £100–£180 depending on the lock type. Includes all materials, labour, and zero call-out fee. Q. How long does it take? A. A typical lock change is completed within 60 minutes. Q. Are you insured? A. Yes—fully insured with DBS-backed locksmiths. Q. Do you work evenings and weekends? A. Yes—24/7 emergency availability is available. Call to schedule visits. 10. Need a Lock Change? Here’s How to Book Call us now for immediate assistance or to schedule a visit Message us via GMB or book through our website Email for a quote if you’d prefer to avoid phone calls Final Thoughts lock change locksmith isn’t just a search phrase—it’s a critical service for secure living and working environments. At SMS Locksmiths, we deliver top-tier products, expert service, and total transparency. Don’t leave your security to chance. Contact SMS Locksmiths today for fast, reliable, and guaranteed lock change services across London.
Getting locked out is never fun — but if you're in Clapham, help is just a call away. Whether it’s late at night or first thing in the morning, SMS Locksmith offers fast, reliable locksmith services throughout Clapham with no call-out charges and 30-minute average response times. Step 1: Don’t Panic We know it’s stressful, especially if it’s cold or you have somewhere to be. Try to stay calm and check for any open windows or alternative entry points (safely, of course). Step 2: Avoid DIY Entry Trying to force the lock or use makeshift tools can damage your door – and cost you more in the long run. Always leave it to a professional. Step 3: Call a Local Clapham Locksmith We’re based nearby and can usually be with you in under 30 minutes. Our experienced technicians use non-destructive methods wherever possible to get you back inside quickly and safely. Step 4: Consider a Security Upgrade If your lockout was due to a lost or stolen key, now might be the perfect time to consider upgrading your locks. We offer a full range of British Standard and high-security locks. Need help right now? Visit our Clapham Locksmith page or call us directly for immediate assistance.
