Fit a lock & handle.

In the UK, many home insurance policies mandate specific security standards, such as British Standard BS3621 for timber doors. A professional locksmith doesn't just swap parts; they ensure the internal mechanism aligns perfectly with the frame, preventing long-term wear and potential lockouts.

What Does the Work Involve?

• Security Assessment: Inspecting the existing door material (timber, UPVC, or composite), frame condition, and current hardware dimensions.
• Removal: Carefully extracting the old handles, cylinders, and internal lock bodies without damaging the door face.
• Preparation: Adjusting the mortice (the hole in the door) or the strike plate (on the frame) using chisels or routers to accommodate new hardware.
• Installation: Fitting the new lock body, euro-cylinder, or sashlock and securing the handles with spindle alignment.
• Calibration: Testing the latch and deadbolt throw to ensure the door closes flush and the key turns without resistance.
• Safety Check: Ensuring any thumb-turn locks or emergency exit hardware functions correctly for fire safety.

Typical Costs

Prices for lock and handle fitting vary based on the security rating of the hardware and whether the job is a simple "like-for-like" swap or a fresh installation requiring carpentry.

Factors affecting the final price include the number of locks being keyed alike (one key for multiple doors), emergency out-of-hours call-outs, and whether the door requires significant modification to accept a modern lock size.

How Long Does It Take?

• Like-for-like cylinder swap: 20–30 minutes per door.
• Full handle and mortice lock replacement: 45–90 minutes depending on wood prep.
• UPVC multi-point gearbox replacement: 1–2 hours.
• Fresh installation (no existing holes): 2–3 hours to ensure precision.

DIY or Professional?

While changing a basic handle is a common DIY task, fitting the lock mechanism itself is best left to a professional. Incorrectly fitted locks can void your home insurance if a burglary occurs. Furthermore, UK building regulations and fire safety standards (especially in flats) require specific hardware that a professional locksmith will be trained to identify and install correctly.

Note: If you have a UPVC or composite door, the multi-point locking system is complex. Forcing a DIY fit can lead to a jammed door that is expensive to rectify.

Choosing the Right Tradesperson

• Look for Master Locksmiths Association (MLA) approved technicians.
• Ensure they carry Public Liability Insurance (minimum £1 million-£2 million).
• Ask if they provide a DBS-checked service for your peace of mind.
• Questions to ask:
  • Are the locks you supply compliant with BS3621 or TS007 standards?
  • Do you offer a warranty on both the parts and your labour?
  • Will you provide a fixed quote including VAT before starting?
  • Will the new handles cover the footprint/holes of the old ones?

UK Regulations

• BS3621: The British Standard for thief-resistant locks. Most insurers require this for ground-floor timber doors.
• TS007 (3-Star): The standard for cylinders on UPVC/composite doors to prevent "lock snapping."
• Fire Safety (Part B): Flat entrance doors usually require "Fire Rated" hardware and often thumb-turn locks to allow exit without a key.
• Equality Act: In certain settings, lever handles are required over knobs to ensure ease of use for all residents.

Common Problems

• Lock Snapping: Using a cheap cylinder that protrudes from the handle, making it easy for intruders to snap. Always opt for "Anti-Snap" 3-star cylinders.
• Misalignment: A door that "needs a shoulder" to lock. This puts immense pressure on the mechanism and will eventually cause it to fail.
• Wrong Backset: Buying a lock that is too deep or shallow for the existing door holes, leading to unsightly gaps or structural weakness.
• Weather Swelling: Timber doors expanding in winter, causing the deadbolt to catch. A professional will allow for seasonal movement during fitting.

Frequently Asked Questions