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Residential Locksmith in London for Homes & Flats

Your front door should be the one thing in the house you never think about. When the key starts sticking, the handle works loose or you are not sure who still has a copy, call a residential locksmith in London on 020 3831 5477. We repair, change and upgrade the locks on houses and flats, fit the standards your insurer asks for, and quote in writing first.
✓Constructionline Gold Accredited
✓BS 3621 / TS007 3-Star Locks
✓12-Month Workmanship Guarantee
✓Written Price First
Booked home visits across London • Homeowners · Tenants · Landlords • Updated October 2026
Home Locksmith CallbackTell us about your door
We ring you back
Written price before work · 12-month workmanship guarantee
Home Locksmith London · Common Problems

Home Locksmith in London: Common Lock Problems We Fix

Most home lock problems start small: a stiff key, a loose handle, a door you have to lift to lock. Sorting them early almost always costs less than waiting for the lock to fail.
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Stiff or Worn Locks

Keys that need a wiggle or a shove usually mean a worn cylinder or a door that has dropped. We lubricate, adjust the keep or replace the cylinder if it is past it.

Cylinder Service
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uPVC and Composite Doors

Handles that lift but do not lock, loose handles and sagging doors. We adjust hinges, repair gearboxes and replace mechanisms and cylinders as needed.

Multipoint Repair
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Mortices and Nightlatches

Timber doors usually have a five-lever mortice and a nightlatch. We repair, rekey or replace them, and tell you when your insurer needs a BS 3621 deadlock.

BS 3621 Fitting
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Lock Changes and Rekeying

After moving, losing keys or a change in who lives with you, you may want the old keys to stop working. We replace or rekey the lock and give you new keys.

New Keys
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Spare and Restricted Keys

We supply keys with every new cylinder and can fit restricted key systems that stop people copying your keys at the shop.

Key Control
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Letterboxes, Chains and Hinges

Letterboxes, door chains, spy holes, hinges and handles all affect security. We fit, repair or replace them and check the door closes properly.

Door Furniture
01 / Home Security Locksmith

Home Security Locksmith Advice: Repair, Rekey or Replace

Not every lock needs replacing. We test the lock, the key, the door and the keep before recommending anything. If a repair will do the job, we repair it. If the lock is worn out, below your insurer’s standard or not worth saving, we say so and quote for the right replacement.
Full lock and door check covering the cylinder, latch, keep, hinges and how the door hangs, before any parts are ordered.
Good-quality locks including BS 3621 mortice locks and TS007 3-star cylinders where your door and insurer need them.
Keys tested before we go so you are left with working keys and a door that locks smoothly.
Locksmith changing a cylinder on a front door
Locksmith On-SiteClean, tidy and explainedConstructionline Gold
02 / Period Doors, Flats & Rentals

Locks for Period Front Doors, Flats and Rentals

From a Victorian front door with a sash lock to a new-build flat with a composite door, we fit locks that suit the door and your insurer, usually in a single visit.
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Doors Adjusted, Not Just Locks

Many lock problems are really a dropped hinge or a swollen door. A small adjustment often fixes the lock without replacing anything.

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Lock Changes Between Tenants

For landlords, we change cylinders, supply keys for each tenant and give you written details of what was fitted.

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Easy Escape in an Emergency

We advise on thumbturn and key-operated locks for exit doors, so you can get out quickly if there is a fire.

New lock and handle on a timber front door
Home Locks Checked & Fitted
How a Home Locksmith Visit Works

Check, Quote, Fit and Hand Over Keys

We explain what we find and what it will cost before any part is fitted.
01

Tell Us the Problem

What the lock or door is doing, the type of door and whether you are locked out. A photo of the lock helps.

Advice while we travel
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We Check and Quote

We test the lock and door, explain the repair, rekey or replacement options and give you a written price.

No work until you approve
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We Fit and Test

We do the agreed work, test every key and the door, tidy up and confirm your 12-month guarantee.

Working keys in your hand
Home Locksmith Cost

What Does a Home Locksmith Cost in London?

A 2026 guide puts a London lock change at £120 to £230 and an anti-snap cylinder upgrade at £120 to £200 (BestBuilders). We give you a written price before we begin.
Repair & AdjustmentQuoted before work

For lock repairs, loose handles and doors that need adjusting.

  • Lock and door checked
  • Handle and latch repairs
  • Hinge and keep adjustment
  • Written price before work
Book a Repair Visit
Most CommonLock Change & New KeysQuoted before work

For cylinder changes, rekeying and new locks.

  • Euro cylinder or mortice replaced
  • Rekeying where suitable
  • New keys supplied
  • Door tested
Book a Lock Change
Several Doors or a RentalPrice after survey

For several doors, rental properties or a full security check.

  • Every outside door checked
  • Matching or keyed-alike locks
  • Lock records for landlords
  • 12-month workmanship guarantee
Request a Price

Written Price Before Work

Parts and labour are shown in your written price before work begins.

✓ Your Approval Before Every Job
Home Lock Questions

Residential Locksmith FAQs

Insurance standards, period doors, flats and what a home visit costs.

It varies, so check the security section of your policy. Many insurers ask for a five-lever BS 3621 mortice lock on external timber doors, and a multipoint lock with a TS007 or anti-snap cylinder on uPVC and composite doors. We fit locks to these standards and can check what you have now.

Most Victorian and Edwardian timber doors suit a BS 3621 five-lever mortice deadlock, often paired with a British Standard nightlatch. We fit them carefully to protect the original door and can match brass, chrome or black finishes so the door keeps its character.

Flat front doors usually need a BS 3621 mortice lock or a nightlatch to that standard, plus a TS007 3-star cylinder if the door uses a Euro cylinder. Some buildings have fire door rules for flat entrances, so we check with you or the managing agent before changing anything.

If the lock is otherwise sound, an adjustment or a new cylinder can be enough. Replacement is better when it is badly worn, damaged, below your insurer’s standard or has been tampered with. We check first, tell you plainly what we find and quote for the option that makes sense.

Yes. Most uPVC and composite doors use Euro cylinders, which are quick to change. We measure carefully so the new cylinder does not stick out past the handle, where it is easier to attack, and we recommend a TS007 3-star rated cylinder.

Yes. We supply keys with every new cylinder and can add extras. Restricted keys usually need proof of authority, because the maker controls copying. If every key has been lost, we can rekey or replace the cylinder so new keys work and the old ones do not.

Yes. For exit doors we can fit thumbturn cylinders and other options that let you get out fast in an emergency, while staying secure from outside. We check that the door and frame suit the lock first, and explain any trade-off with your insurer’s requirements.

Not Sure?

Repair, Rekey or Replace?

Not sure what your lock needs? Call us for straight, practical advice.

Call Us
020 3831 5477
Direct Line
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✓ Honest Repair-or-Replace Advice
✓ 12-Month Workmanship Guarantee
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Home Lock Enquiry

Book a Residential Locksmith in London

Tell us the type of door, what the lock is doing, and whether your insurer has asked for a particular standard.
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Faster by Phone020 3831 5477
Lines open 8am to 5pm daily

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Home Locksmiths Near You

Residential Locksmith Across London

From mansion flats in Belgravia to family homes in Hertfordshire, we look after home locks across London and towns within about 50 miles.
Plumbing & LocksmithOne Number for Both Trades