- Home
- Lock Replacement, Installation & Repair
Lock Replacement, Installation & Repair
Local lock changes, new lock fitting and lock repairs across NW10, West London and surrounding areas.
Need a lock changed after moving home? Lost your keys? Have a damaged or unreliable lock? Want to upgrade a uPVC door cylinder or fit a stronger lock to a wooden front door?
AMZ Locksmith provides lock replacement, new lock installation and lock repair for homes, flats, landlords and local businesses across NW10 and surrounding parts of West and North West London.
We work with common UK locks including Euro cylinders, anti-snap cylinders, mortice locks, night latches, uPVC and composite door locks and multipoint locking mechanisms.
Where a smaller repair or cylinder change will solve the problem securely, we will explain that rather than automatically recommending a complete replacement.
- 24/7 Emergency Help
- Local Mobile Locksmith
- No Call Centre
When Should You Change a Lock?
You should consider changing a lock if your keys have been lost or stolen, you have moved into a new property, the existing lock is worn or unreliable, security has been compromised, or you want to upgrade to a stronger lock.
On many uPVC and composite doors, only the Euro cylinder needs replacing. If the multipoint mechanism itself has failed, a gearbox or complete mechanism repair may be required instead.
Other Services
Call now for emergency locksmith help:
Fast local response • Domestic & commercial • Emergency and urgent locksmith work
Why choose AMZ Locksmith?
- DBS Checked & Fully Insured
- UKLA Member • Professional Local Locksmith
- Clear Pricing • Honest Advice • Non-Destructive Entry Whenever Possible
Lock Replacement, Installation & Repair in NW10 & West London
Need a lock repaired, replaced, or upgraded? AMZ Locksmith provides dependable lock repair, lock replacement, and lock installation services across NW10 and West London. We work with both residential and commercial properties, including houses, apartments, offices, retail units, and rental properties.
If your lock is damaged, worn, sticking, hard to operate, or no longer offering the level of security you need, our experienced locksmiths can assist. From replacing faulty cylinders to upgrading full locking systems, we deliver practical solutions aimed at keeping your property secure and your locks working smoothly.
Professional Lock Repair Services
Not every faulty lock needs a full replacement. In many situations, a professional repair can restore security, improve performance, and help you avoid unnecessary costs. If your key is hard to turn, the lock feels loose, or the door no longer closes correctly, these issues should be addressed before they become more serious.
AMZ Locksmith provides expert lock repair services across West London, offering fast fault diagnosis and effective solutions. Whenever possible, damaged, worn, or misaligned components are repaired or adjusted to restore smooth and reliable operation.
• Fast lock inspections and diagnostics
• Repair of damaged and misaligned locks
• Restoration of worn locking mechanisms
• Emergency lock repairs after break-ins
• uPVC and composite door lock repairs
Lock Installation Services
Professional lock installation is essential for maintaining security and ensuring reliable performance over time. Whether you’re fitting a new lock, upgrading your property’s security, or installing locks on newly fitted doors, every installation is completed with precision and attention to detail.
AMZ Locksmith ensures each lock is properly aligned, securely fitted, and tested for smooth operation, providing dependable protection and long-lasting performance for your home or business.
Residential Lock Installation
Lock fitting for houses, flats, and rental properties including cylinders, nightlatches, and mortice locks.
Commercial Lock Installation
Professional lock installation for offices, shops, and business premises requiring secure access.
Lock Replacement Services
When a lock becomes damaged, worn out, outdated, or no longer provides the level of security you need, replacing it is often the most effective solution. Lock replacement is particularly recommended after lost or stolen keys, attempted break-ins, or when moving into a new home or commercial property.
AMZ Locksmith provides professional lock replacement services to improve security, restore reliability, and give you complete peace of mind.
• Replacement of faulty or worn locks
• Lock changes following lost or stolen keys
• Home and business security upgrades
• Smart lock installation and upgrades
Mechanical Troubleshooting of Multi-Point Lock Systems and Euro Gearboxes
The most frequent failure in modern uPVC and composite entries involves multi-point locking systems, which rely on a central gearbox to throw multiple hooks, rollers, and deadbolts simultaneously. When a handle becomes stiff or completely loose, the issue is typically not the cylinder lock itself, but a structural fracture within the internal drive gears of the gearbox. Attempting to force the handle can completely snap the internal components, locking the mechanism permanently into the door frame.
Our technical approach prioritizes precise mechanism alignment over brute-force replacements. We diagnose door drop, which causes the locking hooks to misalign with the frame keepers, creating excessive friction. By realigning the hinges and resetting the structural balance of the door set, we can often repair and preserve your existing multi-point mechanism, restoring effortless handle operation and preventing future gearbox breakdowns.
Advanced Security Architecture: Anti-Snap, Anti-Pick, and Anti-Drill Cylinders
Upgrading standard entrance locks to advanced high-security cylinders is crucial for defending against modern forced entry techniques.
Standard euro cylinders are highly vulnerable to lock snapping, a method where simple mechanical tools are used to snap the cylinder in half and expose the central cam system in under thirty seconds.
To combat this, we install TS007 3-star rated cylinders or high-security retrofits that feature integrated sacrificial snap lines.
If an attack occurs, the front section of the cylinder breaks away cleanly, while the internal locking core remains fully locked behind a hardened steel defense pin.
Furthermore, these premium cylinders utilize ceramic anti-drill pins and unique anti-pick spool pins within the keyway chamber, which deflect high-speed drill bits and block traditional manual picking tools.
Insurance Approved Timber Door Security: Mortice Deadlocks and Sashlocks
For traditional wooden entrance doors, security relies heavily on the structural strength of a high-quality mortice lock.
Most UK property insurance policies explicitly require that final exit wooden doors must be fitted with a lock that complies with British Standard BS3621.
This certification ensures that the lock case is built with hardened steel plates, features a deadbolt with at least a twenty-millimeter throw, and includes integrated anti-pick curtain mechanisms.
We replace out-of-date 3-lever mortice locks with robust, insurance-approved 5-lever deadlocks and sashlocks.
When completing a brand-new installation on wood frames, we reinforce the door set with heavy-duty box keeps and structural strike plates.
This ensures that any force applied to the door is distributed evenly across the frame structure, preventing split wood failures during attempted break-ins.
Smart Lock Integrations and Keyless Access Control Engineering
Modern security installations increasingly combine traditional mechanical hardware with digital keyless access layers.
Upgrading to electronic or smart locks requires careful hardware matching to ensure the electronic drive motor can safely operate your door without binding.
We specialize in retrofitting top-tier smart locks and digital keypads onto existing uPVC, composite, and timber door profiles.
Our smart lock installation process covers complete mechanical calibration, automatic alignment testing, and backup override configuration.
We ensure that your digital locking system works perfectly alongside your door frame, providing seamless keyless access via biometrics, key fobs, or smartphone applications while fully preserving the underlying physical strength of your door setup.
Lock Replacement Near Me
People search for a lock replacement for many different reasons.
Sometimes the existing lock has stopped working.
Sometimes the lock still works, but there is no longer confidence over who has copies of the keys.
In other cases, the customer wants better security rather than waiting for an old lock to fail.
Common reasons for changing a lock include:
- Moving into a new house or flat
- Lost keys
- Stolen keys
- Previous tenants retaining keys
- Damaged or worn locks
- Stiff locks
- Broken cylinders
- Burglary or attempted burglary
- Security upgrades
- Insurance requirements
- uPVC lock problems
- Upgrading to an anti-snap cylinder
- Replacing an old mortice lock
- Changing locks between tenancies
The correct replacement depends on the door and the lock already fitted.
There is no benefit in installing an expensive lock that is unsuitable for the door, and there is no reason to replace a complete mechanism if only one part has failed.
We inspect what you already have first.
Should I Change the Locks After Moving House?
For many people, this is one of the first security jobs worth considering after moving.
Even if the previous owner or tenant has handed over every key they know about, there is usually no practical way to know how many copies have been made over the years.
Spare keys may have been given to:
- Family members
- Neighbours
- Cleaners
- Contractors
- Builders
- Estate agents
- Previous tenants
- Dog walkers or carers
Changing the external locks gives you control over who can enter the property.
Importantly, this does not always mean replacing the entire locking system.
If a uPVC or composite door has a perfectly good multipoint mechanism, changing the Euro cylinder may be enough to make every old key unusable.
On wooden doors, the appropriate solution may be a new mortice lock, night latch or cylinder depending on what is fitted.
Lost or Stolen Keys: Should I Change the Lock?
If keys have been stolen, or lost in circumstances where they could be linked to your property, changing the affected lock is usually worth considering.
A new lock or cylinder makes the missing keys useless.
The exact work depends on the door.
For example, on a uPVC door it may only be necessary to replace the Euro cylinder.
On a timber door with a mortice lock, the lock body may need changing.
If the existing lock is already old or below the level of security you want, the situation can also be an opportunity to upgrade.
We explain the available options before carrying out replacement work.
Do I Need the Whole Lock Replaced?
Not always.
This is one of the most common questions people ask before arranging a lock change.
Different locks are constructed differently, so “changing the lock” can mean different things.
Euro Cylinder
On many uPVC and composite doors, the visible key cylinder can be replaced separately from the multipoint locking mechanism.
If the multipoint system is functioning correctly, replacing only the cylinder can be enough after lost keys, moving home or a security upgrade.
Multipoint Lock
If the handle has become stiff, the door will not lock correctly or the locking points have stopped moving, the fault may be in the gearbox or multipoint mechanism.
A cylinder replacement alone will not fix this.
Mortice Lock
Mortice locks are built into the edge of timber doors.
Where the internal lock body has become worn, damaged or needs upgrading, the complete mortice lock may need replacing.
Night Latch
With night latches, the cylinder and internal latch body can sometimes be dealt with separately depending on the fault.
Euro Cylinder Replacement
Euro cylinders are among the most common locks fitted to modern doors.
You will often find them on:
- uPVC front doors
- Composite doors
- Patio doors
- Some aluminium doors
- Certain commercial doors
A Euro cylinder change may be appropriate if:
- Your keys have been lost
- Keys were stolen
- You have moved home
- The cylinder is stiff
- The cylinder is damaged
- The key has become difficult to turn
- You want the old keys to stop working
- You want better resistance to lock snapping
The cylinder must also be correctly sized.
A cylinder that projects unnecessarily beyond the door furniture can be more vulnerable than one fitted correctly.
We measure the existing door and cylinder before selecting the replacement.
Anti-Snap Lock Replacement and Upgrades
Anti-snap cylinders are designed to provide stronger resistance against cylinder snapping attacks.
They are commonly considered by homeowners with uPVC and composite doors.
Higher-security cylinders may also include additional resistance against methods such as picking, drilling and bumping depending on the product specification.
If your current cylinder is old, projecting too far from the door or offers limited security, we can discuss a more appropriate replacement.
The cylinder is still only one part of the door’s security.
Handles, multipoint mechanisms, hinges, door alignment and the quality of the overall installation also matter.
BS3621 Mortice Lock Replacement
BS3621 is a recognised British Standard associated with thief-resistant locks commonly fitted to external timber doors.
It is frequently mentioned in relation to home insurance requirements.
Typical locks include:
- Five-lever mortice deadlocks
- Mortice sash locks
- Certain higher-security night latches
If your insurer requires a particular standard, check the wording of your own policy.
Insurance requirements vary, so we would rather match the lock to an actual requirement than make a blanket claim that one lock suits every insurer.
Is My Current Lock Insurance Compliant?
That depends on your insurance policy and the door.
Some policies specify a minimum standard for locks fitted to external doors.
Requirements can refer to:
- BS3621 mortice locks
- Appropriate night latches
- Multipoint locking systems
- Patio door security
- Window locks
If your policy contains a specific requirement, show us the wording.
We can then assess whether the existing lock meets it and discuss a suitable replacement if it does not.
uPVC Door Lock Replacement
A uPVC door lock is more than just the part where the key goes.
Most uPVC doors combine a Euro cylinder with a multipoint locking mechanism.
That means several different components can fail.
Possible faults include:
- Worn cylinder
- Failed gearbox
- Broken multipoint mechanism
- Misaligned door
- Worn handles
- Damaged locking points
- Internal mechanism failure
If the cylinder is the only problem, it can often be replaced independently.
If the handle is difficult to lift, the locking points do not engage or the door only locks when pushed or pulled, the problem may be elsewhere in the mechanism.
This is why diagnosis matters before replacement.
Composite Door Lock Replacement
Composite doors commonly use the same type of Euro-cylinder and multipoint arrangement found on uPVC doors.
Typical reasons for replacing components include:
- Lost keys
- Security upgrades
- Stiff cylinder
- Faulty gearbox
- Multipoint mechanism failure
- Door alignment problems
- Worn handles
Again, replacing the entire mechanism is not automatically necessary.
We identify which part has failed first.
Multipoint Lock Replacement and Repair
Multipoint locking systems secure a door at several points when the handle is lifted.
Hooks, rollers or bolts move into keeps positioned along the frame.
Warning signs of a developing fault can include:
- Handle becoming harder to lift
- Key becoming stiff
- Door requiring pressure before it locks
- Hooks not engaging properly
- Handle becoming loose
- Mechanism feeling rough
- Door occasionally refusing to lock
In some cases, the gearbox can be replaced without changing the entire locking strip.
In others, a complete multipoint mechanism may be needed.
Mortice Lock Replacement
Mortice locks are installed into a pocket cut into the edge of a timber door.
They are common on older London properties as well as modern wooden entrance doors.
You may need a mortice lock replaced if:
- The key has become difficult to turn
- The internal mechanism is worn
- The lock is damaged
- You have lost the keys
- You have moved property
- A higher security standard is required
Replacement locks vary in size and specification.
Where possible, matching the new lock correctly to the existing door preparation reduces unnecessary alteration to the door.
Night Latch and Yale-Type Lock Replacement
Night latches are common on houses and flats across London.
Because many automatically latch when the door closes, they are convenient but can also contribute to lockouts if keys are left inside.
Replacement may be appropriate where:
- The latch no longer operates smoothly
- The cylinder is worn
- Keys have been lost
- The property has changed occupants
- Security needs upgrading
- The internal mechanism is damaged
Depending on the condition of the lock, replacing the cylinder may be enough or the complete night latch may need changing.
Lock Repair or Lock Replacement?
Not every faulty lock needs replacing.
A repair may make more sense if:
- The fault is minor
- The lock is still secure
- Door alignment is causing the problem
- A replaceable component has failed
- The mechanism is otherwise in good condition
Replacement is usually more sensible when:
- The lock is badly worn
- Internal components are broken
- Security has been compromised
- Parts are obsolete
- Keys cannot be accounted for
- A security upgrade is required
- Repeated repairs are no longer economical
We assess the fault before recommending either option.
The objective is not to replace as much hardware as possible.
It is to leave you with a lock that works correctly and provides the level of security you need.
New Lock Installation
Sometimes there is no existing lock to replace.
A customer may want an additional lock fitted or a new lock installed as part of a renovation, new door or security improvement.
New lock installation may be suitable for:
- Front doors
- Back doors
- Flats
- Rental properties
- Shops
- Offices
- Internal security doors
- Storage rooms
Fresh installation usually requires more work than replacing an existing lock because the door and frame may need preparation for the new hardware.
We inspect the door first and recommend an appropriate type of lock.
How Much Does It Cost to Change a Lock?
This is one of the highest-intent questions on the page.
The cost of changing a lock depends on the type of lock, security specification, door and amount of work required.
For AMZ, the price may depend on:
- Type of Lock
- Security Grade
- Parts Required
- Door Type
- Whether Existing Lock Must Be Removed
- Like for Like Replacement
- New Lock Installed From Scratch
- Door Alignment Attention
- Time of Attendance
Common Lock-Change Situations
| CUSTOMER'S SITUATION | LIKELY WORK |
|---|---|
| Lost keys on uPVC door | Euro cylinder replacement |
| Moving into a new home | External lock/cylinder changes |
| Weak standard cylinder | Anti-snap cylinder upgrade |
| Old timber door lock | Mortice lock replacement |
| Faulty night latch | Cylinder or night latch replacement |
| Failed uPVC gearbox | Gearbox or mechanism repair |
| Failed multipoint system | Partial or full mechanism replacement |
| New security requirement | Fresh lock installation |
We prefer to understand what is fitted before quoting rather than advertise a very low headline price that does not apply to the actual job.
Can You Change My Lock on the Same Day?
Often, yes.
AMZ Locksmith operates as a mobile locksmith and carries common replacement locks, cylinders and components.
Straightforward jobs such as many Euro cylinder changes, standard lock replacements and common security upgrades can often be completed during the first visit.
Specialist multipoint mechanisms and older locks may require a specific replacement part to be identified and sourced.
If this is the case, we explain it clearly.
Lock Changes for Landlords and Rental Properties
Landlords, estate agents and property managers often need locks changed when occupancy changes.
Typical situations include:
- Tenant moves out
- Keys are not returned
- New tenant moving in
- Lost management keys
- Damaged lock
- Security concern
- Failed uPVC mechanism
- Property legally regained
- Lock upgrade required
Where work involves access to or securing a rental property, the person requesting the work must have appropriate authority.
Commercial Lock Replacement
Businesses also need control over who has access to their premises.
A lock change may be needed after:
- Employee keys are not returned
- Business keys are lost
- Change of tenant
- Change of occupier
- Break-in or attempted break-in
- Damaged lock
- Security upgrade
- Existing lock failure
We can assist with suitable shops, offices and other local commercial properties.
Better Security Does Not Always Mean Replacing Everything
One of the most useful things a locksmith can do is identify what actually needs changing.
Depending on the door, improving security could involve:
- Replacing a weak Euro cylinder
- Fitting an anti-snap cylinder
- Upgrading a mortice lock
- Replacing a worn night latch
- Repairing a multipoint gearbox
- Correcting door alignment
- Replacing damaged handles
- Installing an additional lock
Sometimes a relatively small upgrade makes more sense than replacing an entire locking system.
Why Choose AMZ Locksmith for Lock Replacement?
Lock Replacement Areas We Cover
AMZ Locksmith provides lock replacement, lock installation and lock repair across NW10 and surrounding West and North West London areas, including:
- Harlesden
- Willesden
- Acton
- Park Royal
- Alperton
- Perivale
- Wembley
- Neasden
- Kensal Rise
- Queen's Park
- Kilburn
- Cricklewood
- West Hampstead
- Ladbroke Grove
- Shepherd's Bush
If you are nearby but do not see your location listed, call us with your postcode and we can confirm availability.
Frequently Asked Questions
How much does it cost to change a lock?
The cost depends on the lock type, door, security level and whether you need a simple cylinder replacement or a complete lock or mechanism change. We aim to identify the lock and explain the expected price before work begins.
Should I change the locks when I move house?
It is often sensible because you cannot know how many copies of the previous keys still exist. On some doors, changing the cylinder is enough and the complete locking mechanism does not need replacing.
Do I need to replace the whole lock if I lose my keys?
Not necessarily. On many uPVC and composite doors, replacing the Euro cylinder will make the old keys unusable while leaving the existing multipoint mechanism in place.
Is it cheaper to change the lock barrel or the whole lock?
Usually, replacing only a Euro cylinder is less work than replacing an entire multipoint mechanism. Whether this is suitable depends on which component is actually faulty.
What is an anti-snap lock?
An anti-snap cylinder is designed to provide increased resistance against cylinder-snapping attacks. It is commonly used as a security upgrade on suitable uPVC and composite doors.
What is a BS3621 lock?
BS3621 is a British Standard associated with certain thief-resistant locks commonly fitted to external timber doors. Some home insurance policies refer to this standard.
Can you replace a uPVC door lock?
Yes. Depending on the fault, the job could involve replacing the Euro cylinder, gearbox, multipoint mechanism, handles or another component.
Do I need a whole new multipoint lock if my uPVC door is faulty?
Not always. A gearbox, cylinder or alignment problem may be responsible. The door should be inspected before replacing the entire mechanism.
Can you change my locks the same day?
Many common lock and cylinder changes can be completed during the first visit. Specialist or older mechanisms may occasionally need a specific part to be sourced.
Do you cover NW10 and West London for lock changes?
Yes. AMZ Locksmith provides lock replacement, installation and repair across NW10 and surrounding West and North West London areas.