Lock replacement or key making

Modern locksmithing involves more than just swapping a cylinder; it requires a precise understanding of door mechanisms and British Security Standards. Choosing the right hardware not only provides peace of mind but can also prevent your home insurance policy from being invalidated in the event of a claim.

What Does the Work Involve?

• Site Assessment: Evaluating the door material (uPVC, timber, or composite) and checking the condition of the frame and strike plates.
• Mechanism Measurement: Taking precise measurements of backsets, centres, and cylinder lengths to ensure a flush, secure fit.
• Component Removal: Carefully extracting old cylinders, mortice boxes, or multipoint locking strips without damaging the door's integrity.
• Installation: Fitting the new lock body, cylinder, and furniture, followed by the alignment of the strike plate to ensure smooth operation.
• Key Provision: Cutting and testing a set of keys (usually 2 or 3) to ensure they operate the mechanism without resistance.
• Smart Configuration: If installing electronic locks, the locksmith will programme fobs, smartphone apps, or keypad codes and test the fail-safe overrides.

Typical Costs

Locksmith pricing in the UK varies based on the time of day and the complexity of the locking mechanism. Emergency "out-of-hours" calls will significantly increase the total bill due to premium labour rates.

Note: Prices include VAT. Costs are influenced by your location (London and the South East are typically 20% higher) and the brand of hardware chosen, such as Yale, ERA, or Ultion.

How Long Does It Take?

• Standard Euro Cylinder Change: 20–40 minutes. This is a straightforward "like-for-like" swap on most uPVC doors.
• Mortice Lock Installation: 45–90 minutes. This may take longer if the door needs to be "rebated" or the frame needs fresh chiselling.
• Multipoint Mechanism Replacement: 1–2 hours. These are complex strips running the length of the door and require precise alignment.
• Fresh Fit (New Door): 2–3 hours. Installing a lock into a brand-new door where no holes exist requires significant precision.

DIY or Professional?

While basic cylinder swaps are possible for a confident DIYer, professional installation is highly recommended for external doors. A professional locksmith ensures that the lock meets BS3621 standards, which is a mandatory requirement for most UK home insurance providers.

Incorrectly fitted locks are vulnerable to "lock snapping" or "bumping," techniques used by burglars to bypass cheap or poorly installed cylinders in seconds. Furthermore, if a DIY-fitted lock fails or allows entry during a break-in, your insurer may refuse to pay out.

Choosing the Right Tradesperson

• Check Qualifications: Look for members of the Master Locksmiths Association (MLA) or those with NCFE Level 3 certification.
• Vetting: Ensure the locksmith has a clean, up-to-date DBS (Disclosure and Barring Service) check.
• Insurance: Verify they carry Public Liability Insurance (minimum £1 million-£2 million).
• Transparent Pricing: A reputable locksmith should provide a clear quote over the phone based on your description or a photo.

Questions to ask: Do you offer a guarantee on parts and labour? Are the locks you supply BS3621 compliant? Is there a separate "hourly rate" on top of the call-out fee?

UK Regulations

• BS3621: The British Standard for thief-resistant locks on timber doors. Look for the "Kitemark" on the lock faceplate.
• TS007: The standard for cylinders on uPVC/Composite doors. A "3-star" rating (either a 3-star cylinder or a 1-star cylinder with 2-star handles) is the gold standard.
• Part Q (Building Regs): Applies to new builds, requiring all easily accessible doors to meet specific security performance standards (PAS 24).
• Fire Safety: Flats and communal buildings must use locks that allow "keyless egress" (thumb-turns) to ensure residents can escape during a fire without searching for a key.

Common Problems

• Incorrect Cylinder Size: If a cylinder protrudes more than 3mm from the handle, it is highly vulnerable to "snapping."
• Misaligned Strike Plates: If you have to "lift" the handle or pull the door hard to lock it, the mechanism will eventually fail under the strain.
• Cheap Imports: Non-branded locks often lack hardened steel pins, making them easy to drill out in seconds.
• Key Duplication Issues: Poorly cut keys can wear down the internal pins of a new lock, leading to a total seizure of the mechanism.

Frequently Asked Questions

Do I need to change the locks when I move into a new house?

Yes, it is highly recommended. You have no way of knowing how many spare keys were given to neighbours, tradespeople, or former tenants by the previous owner.

What is an "Anti-Snap" lock?

These are Euro cylinders designed with a sacrificial cut. If a burglar tries to snap the lock, only the front portion breaks off, leaving the actual locking mechanism protected inside the door.

Will my insurance be void if I don't have a 5-lever mortice lock?

Most UK policies for timber doors require a 5-lever deadlock that meets BS3621. Check your policy "key facts" document; if you don't meet their requirements, they may decline a theft claim.

Can a locksmith open my door without damaging it?

A skilled locksmith will always aim for "non-destructive entry" using picking or bypassing tools. Drilling the lock is usually a last resort when the mechanism has suffered a total internal failure.

What is a "Master Key" system?

This allows you to have one key that opens every door in your house (front, back, garage, and shed), while still allowing individual keys for specific doors if needed.

How can I tell if my lock is British Standard?

Look at the faceplate (the metal part visible when the door is open). It should have the BSI Kitemark symbol and the code "BS3621" stamped directly into the metal.