How Lock Replacement Works: Step-by-Step Process Explained

How Lock Replacement Works: Step-by-Step Process Explained
Whether you’ve recently moved into a new property, lost your keys, experienced a break-in, or simply want to upgrade your home security, lock replacement is one of the most effective steps you can take. But what actually happens during a lock change?

What should you expect from a professional locksmith in London?

At Locksmith CO, we believe in providing clear, transparent service. In this guide, we walk you through the step-by-step process of lock replacement, explain how to choose the right locks, and highlight why hiring a qualified locksmith ensures both security and peace of mind.

When Should You Consider Replacing a Lock?

Lock replacement isn’t just for emergencies. Here are some of the most common reasons Londoners choose to change their locks:

• Lost, stolen, or unreturned keys
• Moving into a new home or flat
• Damaged, worn, or faulty locks
• Upgrading to British Standard (BS3621) or insurance-compliant locks
• Switching to smart locks or digital systems
• Break-ins or attempted burglaries
• Changing access after a tenancy ends or relationship changes

Once the need for lock replacement has been identified, the process begins.

Step 1: Initial Assessment and Call-Out

The first step is to contact a professional locksmith, either by phone or online. At Locksmith CO, our 24/7 line is open every day of the year, and our technicians can usually arrive within 30 minutes, depending on your London location.

What happens during the initial consultation:

• You explain your situation (e.g., lost key, lock not working, security upgrade)
• Our team provides a transparent price estimate
• We confirm the type of door or lock involved (e.g., wooden, uPVC, composite)
• Tip: The more details you can provide during the call, the better prepared our locksmith will be on arrival.

Step 2: On-Site Inspection and Lock Identification

Once the locksmith arrives, they will:

• Inspect the door and lock type
• Check for visible damage or wear
• Determine if repair is possible, or if full replacement is necessary
• Discuss your preferences (e.g., keyed-alike systems, insurance compliance, smart features)

Common types of locks we assess and replace include:

• Mortice locks (often used on wooden doors)
• Euro cylinder locks (found in uPVC and composite doors)
• Rim cylinders / night latches (Yale-style locks)
• Multi-point locking systems
• Smart locks and keyless systems

This step ensures the right replacement is selected for security, compatibility, and convenience.

Step 3: Lock Removal

Once the best replacement option has been agreed upon, the locksmith will proceed to remove the existing lock. This is done using specialist tools and without causing damage to the door or frame.

For standard locks, removal involves:

• Unscrewing the lock faceplate or escutcheon
• Extracting the cylinder or deadbolt
• Checking the internal mechanism for any hidden issues

If the lock is jammed or broken, non-destructive removal methods are used first. In rare cases where this isn’t possible, controlled drilling may be required—and always with your consent.

Step 4: Lock Replacement and Installation

After removal, the new lock is installed. This step is critical to ensuring your door operates smoothly and your property is secure.

A professional locksmith will:

• Fit the new lock to match the existing door cutout (or adjust if necessary)
• Align the strike plate and latch for a smooth lock action
• Secure all screws and fasteners tightly
• Ensure there’s no sticking, misalignment, or play in the mechanism
• Test the lock multiple times (with all provided keys)

At Locksmith CO, we use only high-quality, British Standard-approved locks, ensuring your home meets both security expectations and insurance requirements.

Step 5: Key Testing and Handover

Once installed, the locksmith will:

• Provide you with a full set of new keys (usually 2–3 by default)
• Test each key in the lock to confirm smooth operation
• Explain how to use any additional features (e.g., dual locks, key codes, or app control for smart locks)
• Offer advice on key duplication or key storage if needed

Pro Tip: Always store one spare key in a secure place. Avoid hiding it outside—instead, consider a key safe or trusted contact.

Step 6: Final Security Check and Advice

Before leaving, the locksmith will:

• Ensure the lock is working properly with the door fully closed
• Perform a security check on nearby entry points (if requested)
• Recommend potential upgrades (e.g., window locks, door chains, CCTV, or smart alarms)
• Provide an invoice and warranty for the lock and labour

With Locksmith CO, you can be assured that all work is backed by a guarantee, and our team is always available for follow-up support.

Optional: Additional Services with Lock Replacement

Depending on your situation, you may wish to combine lock replacement with:

• Keyed-alike system setup – One key to open multiple locks
• Smart lock installation – Keyless entry via code, phone, or fob
• Remote access setup – Ideal for Airbnb or rental properties
• Security upgrades – Additional locks, bolts, or sash jammers
• Full property security assessment

Our locksmiths are happy to discuss additional solutions based on your needs and budget.

How Long Does Lock Replacement Take?

For a standard door lock, the full replacement process typically takes 30 to 60 minutes. More complex installations, such as multi-point locks or smart locks, may require a little longer.

Rest assured, Locksmith CO aims to minimise disruption and complete the job in a single visit.

Why Choose Locksmith CO for Lock Replacement in London?

• 24/7 emergency and scheduled lock replacement
• Installation of BS3621-compliant and insurance-approved locks
• Smart lock expertise and security system integration
• Fully equipped mobile locksmith units across Greater London
• DBS-checked, insured, and experienced technicians
• Transparent quotes, no hidden fees, and friendly service

Ready to Replace Your Lock?

Whether it’s urgent or planned, trust Locksmith CO to deliver secure, professional lock replacement anywhere in London.

Call us now on +44 20 3885 1735
Or visit https://locksmithco.co.uk to request a quote or book an appointment online.

Don’t wait for a problem to get worse—upgrade your locks today with Locksmith CO and enjoy the peace of mind you deserve.