Door and lock identification
Construction, thickness, existing cut-outs, dimensions and hardware system recorded first.
Alesta · Lock installation in London
The right lock, fitted to the right door.
Replacement and new lock installation planned around door construction, dimensions, access, security requirements and the way the entrance needs to operate.
☎ Call 020 3608 3976Compatibility before hardware
A lock must suit the door, frame and security requirement together.
Timber, composite, uPVC, aluminium and communal entrance doors use different cases, cylinders, multipoint strips and fixing methods. Choosing from appearance or a generic product description can leave poor alignment, weakened material or a lock that does not meet the intended use.
We establish whether the project is a like-for-like replacement, a security upgrade, a new position or part of a door repair. Insurance requirements, lease conditions, fire-door status, key control and escape operation must be raised before hardware is selected.
Security brief
Access needs, key users and any stated insurer or property requirement considered.
Compatible installation
Lock, cylinder, handles and keeps matched to the door and fitted without casual alteration.
Alignment and function testing
Closing, locking, unlocking and internal exit operation checked after installation.
Common reasons customers call
When the existing lock or entrance arrangement needs to change.
Keys should no longer provide access
A move, lost key or change of occupant creates a need for controlled replacement.
The current lock is worn or obsolete
A failing or unsupported mechanism no longer offers dependable everyday operation.
The door needs a security upgrade
The hardware must be selected against a defined security or insurer requirement.
A new internal or external door needs hardware
Fresh installation requires accurate positioning, compatible construction and frame preparation.
Why Alesta for lock installation
A specified fitting rather than an assumed lock swap.
Dimensions checked
Backset, centres, door thickness, faceplate and cylinder length are confirmed as applicable.
Door type respected
Hardware and cutting methods are chosen for timber, composite, metal or multipoint doors.
Requirements documented
Fire, lease, insurance or shared-entry considerations are raised before installation.
Keys and operation handed over
Supplied keys, locking sequence and any maintenance notes are explained clearly.
A measured installation
How we replace or install a lock.
The process begins with the reason for change and the existing door. We request photographs of both sides, the door edge, full frame and any lock markings, plus the door material and approximate thickness. For multipoint systems, handle centres, backset and faceplate details may be needed. You should disclose lost keys, attempted entry, property-management rules, fire-door labels and any insurer specification instead of asking for a vague “high-security” lock.
At the property, the locksmith verifies authority to make the change and inspects the door, frame and existing preparation. A replacement can be like for like only when the current cut-outs, alignment and desired outcome remain suitable. For a new position, the locksmith checks clearances, glazing, panels, frame strength and conflict with other hardware. The hardware specification and visible finish are confirmed before irreversible drilling or cutting begins.
The old component is removed carefully where replacement is required, and the new lock is fitted to accurate dimensions with appropriate fixings. Mortices, faceplates, cylinders, spindles and keeps are prepared according to the system rather than enlarged casually to make a part fit. Multipoint gear must match the door and connected hardware. If rot, cracks, distortion or an incompatible previous cut-out prevents a sound installation, door repair or a revised product may be necessary before work continues.
The completed installation is tested with the door open and closed. The locksmith checks latch action, bolt or hook engagement, handle return, cylinder projection, key withdrawal and internal escape operation as relevant. All supplied keys are counted and handed over, and the customer is shown the correct locking sequence. A lock can only perform as intended when the door closes consistently, so any remaining frame or hinge limitation is documented rather than hidden behind a newly fitted component.
Clear pricing
Lock replacement and installation prices.
Cost depends on door construction, lock system, security specification, dimensions, access, preparation, parts and visit timing.
| Service scope | Price | What affects the final price |
|---|---|---|
| Like-for-like cylinder or lock replacement | Quoted after assessment | Lock type, dimensions, part specification, access and fitting |
| Security upgrade or multipoint component | Quoted after assessment | Required standard, compatibility, hardware system and labour |
| New lock position or door preparation | Quoted after assessment | Door material, cutting, frame keep, finish and testing |
Pricing context: Photos and measurements are required before a reliable quote. Door repair, fire-door alterations, access-control wiring and emergency opening are separate unless specifically included.
How the service works
From door details to a properly fitted lock.
Confirm door and security outcome
Share photos, dimensions, users and any insurer or property requirement.
Specify compatible hardware
The locksmith matches lock, cylinder, handles and frame preparation.
Install, align and hand over
The new hardware is fitted, tested and supplied keys are confirmed.
Lock installation FAQ
Before choosing the replacement lock.
Useful answers about lock choice, keys, door types, fire doors, preparation and price.
☎ Call 020 3608 3976How do you identify the correct replacement?
Photographs and dimensions help identify the lock family, but the locksmith also checks door construction, existing preparation, connected hardware and the desired security outcome.
Can I buy the lock myself?
You can, but share the full specification first. Incorrect dimensions, handing, cylinder length or system compatibility can prevent safe fitting and supplied parts remain your responsibility.
Should I change locks after moving home?
Many occupants choose to because the number of historic keys is unknown. The suitable change depends on door type, ownership permissions and the existing locking system.
Can you fit locks to uPVC or composite doors?
Yes, when compatible components are available. These doors often use multipoint systems, so exact gearbox, faceplate, centres and cylinder dimensions matter.
Can a lock on a fire door be changed?
Potentially, but the door’s certification, required hardware and escape function must be respected. Unapproved alteration can compromise the assembly, so disclose all labels and building requirements.
How many keys are supplied?
That depends on the selected product. The quotation should state the included key count, and authorised additional or restricted keys may need separate ordering.
What affects the final price?
Door type, lock specification, dimensions, existing damage, preparation, key requirements, access and visit timing all influence the quote.