Changing a door lock might seem straightforward, but professional locksmiths follow a precise process to ensure the new lock is fitted correctly, functions smoothly and provides the security level your property needs. Here is how Keys4U Locksmith approaches every lock change.
Step 1: Assessment and Diagnosis
Before touching any tools, our locksmith assesses the door and existing lock. We identify the door material, whether it is timber, UPVC, composite or aluminium, and note the type of lock currently fitted. This determines the replacement options available and ensures compatibility.
We also check for any door alignment issues. A misaligned door can cause locks to bind and wear prematurely. If alignment problems exist, we address them as part of the service.
Step 2: Removing the Old Lock
The removal process varies by lock type. For euro cylinders in UPVC doors, we unscrew the retaining screw through the faceplate, then turn the key slightly and slide the cylinder out. Mortice locks require removal of the faceplate screws before withdrawing the lock case from the edge of the door.
Throughout removal, we protect the door surface from scratches and damage. Professional tools and technique prevent the cosmetic damage that DIY attempts often cause.
Step 3: Measuring and Selecting the Replacement
Accurate measurements are critical. For cylinder locks, we measure the internal and external dimensions to the millimetre. Getting this wrong means the cylinder protrudes dangerously or sits too shallow, compromising both security and function.
We then recommend the appropriate replacement based on your security needs, door type and insurance requirements. This might be a standard cylinder, anti-snap high-security cylinder, or a smart lock for keyless entry.
Step 4: Fitting the New Lock
The new lock is carefully inserted and secured. For cylinders, we ensure it is perfectly centred with the cam aligned to the locking mechanism. For mortice locks, the faceplate is flush with the door edge and all levers engage smoothly with the strike plate.
We then test the lock multiple times from both sides, with the door both open and closed, verifying smooth operation under real conditions.
Step 5: Key Handover and Documentation
Once satisfied, we cut and test all supplied keys, demonstrating the lock's operation to you. We provide documentation confirming the lock standard and security rating, useful for insurance purposes. All old keys and lock components are removed and disposed of securely.
Professional vs DIY
While DIY lock changes are possible, professional fitting ensures correct alignment, security compliance and warranty protection. A poorly fitted lock may invalidate your home insurance or fail when you need it most.
For expert lock changes backed by guarantee, contact Keys4U Locksmith. Our trained professionals deliver precise, secure installations every time.
