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Locksmith services
Lock Change in Bow
Looking for a lock change in Bow? Moving in, lost keys, a tenant changeover, or simply tightening security — a proper lock change goes beyond swapping the part. It’s about matching the new lock correctly to the door, fitting it cleanly, and testing it so it operates smoothly every time.
E3 Locksmiths Bow runs a dedicated lock change service throughout Bow and the surrounding areas, focused on doing one job properly: changing your lock so you take back control of access.
As your local Bow locksmith team, we also handle related services such as door lock replacement and door lock installation.
If you’re locked out or need someone urgently, use our emergency locksmith service.
Our lock change service is available to residents and businesses right across Bow, ideal for new property moves, lost keys, and tenant changeovers.
Locksmith services
What our lock change service includes
If you’re here for a lock change, you’ve landed in the right place. Everything on this page centres on:
changing the lock,
picking the correct lock type and security level,
fitting it correctly,
and confirming the door locks/unlocks reliably.
When to act
When you should book a lock change
Lock changes aren’t reserved for emergencies. Most people book a lock change for one of these reasons:
After moving in
Even when the previous owner seems trustworthy, there’s no way to know how many copies of the keys are out there. A lock change gives you a clean start.
Lost, stolen, or unaccounted-for keys
If keys have gone missing and you can’t be certain where they’ll turn up, a lock change puts you back in control of access.
Tenant or staff changeovers
If several people have held keys over time, a lock change helps stop “old keys” being used down the line.
After a break-in attempt or forced entry
Even if the door still functions, the lock (and the surrounding fixing/keep area) may be stressed or compromised. A lock change makes the locking points and cylinder/mechanism dependable again.
Upgrading security (without changing the door)
Many doors can take a higher-security lock option without major work, provided the correct spec is picked for the door.
Worn lock that’s becoming unreliable
If the lock is stiff, inconsistent, or beginning to cause key-turn problems, it’s usually wiser to book a lock change before it gives out at the worst possible moment. If the keys are still secure and the fault may be fixable, see lock repair.
Common issues
Where lock changes are commonly needed
Property types
Flats and maisonettes
Houses (front, back, side access doors)
Rental properties (landlord changeovers)
HMOs and multi-let buildings (restricted access doors)
Shops, offices, and small commercial units
Communal doors (where the dutyholder/building manager permits)
Door locations people typically change locks on
Main entrance doors
Back doors and garden access doors
Side access doors and lockable gates (where the lock type allows a genuine “lock change”)
Internal access doors guarding sensitive areas (storerooms, offices, staff areas)
Communal entrance doors (subject to site rules and permission)
Locksmith services
What a lock change includes with E3 Locksmiths Bow
A professional lock change should leave you with a lock that’s secure, smooth, and correctly aligned.
What we do during a lock change
- Identify the exact lock type currently fitted (so the replacement is compatible)
- Measure accurately (so it sits flush, works smoothly, and doesn’t protrude)
- Take out the old lock cleanly
- Fit the new lock and fasten it properly
- Line the lock up with the keep/strike so it locks without force
- Test thoroughly:lock/unlock from both sides (where applicable)key turns smoothly (no gritty feel, no “catch” points)bolt/latch engagement is cleandoor closes and locks consistently without “lifting” or “pulling” tricks
- Hand over the new keys supplied with the lock
What we check to make sure the new lock feels right in daily use
Door alignment and pressure on the lock (a frequent reason locks feel stiff)
Keep/strike position so the bolt/latch engages fully
Fixing integrity (so the lock doesn’t work loose and drift over time)
Flush fitting (cuts vulnerability and improves stability)
What a lock change does not involve
No guess fitting or forcing incompatible parts
No leaving you with a stiff lock that only works if you lift/pull the door
No mixing random components that don’t suit your door type
Your options
Lock change options (what we can change, and what you should choose)
1) Euro cylinder lock change (very common on multi-point doors)
Often seen on uPVC doors, composite doors, some modern timber doors with multi-point locking, and certain aluminium door systems.
- Correct size (internal/external measurement so it sits centred and stable)
- Flush fit (prevents protrusion and improves security)
- Correct cam behaviour (so locking is smooth and consistent)
- Security level (basic vs high-security features such as anti-snap/anti-drill/anti-pick)
- Whether you want:key operation from both sides,thumbturn on the inside (common where fast exit is needed),an emergency function cylinder (design-dependent),keyed alike (same key for multiple doors, where compatible).
Using the wrong cylinder length (leaving it protruding or sitting loose)
Fitting a cylinder that binds because door alignment wasn’t checked
Overlooking how the door actually locks (multi-point doors have to throw correctly and consistently)
2) Mortice lock change (often on timber doors)
Often seen on traditional wooden front doors and older internal access doors.
Correct case size and backset (so it fits the existing cut-out properly)
Correct forend size (so it sits flush and neat)
Strike/keep alignment (so it closes and locks without forcing)
Security grade choice (many people go for an insurer-recognised option on external doors)
“The key turns but doesn’t throw the bolt cleanly”
“The bolt scrapes or catches”
“The lock works with the door open, but not shut”
A proper lock change includes correcting the alignment so the new mortice lock works smoothly in everyday use.
3) Nightlatch lock change (common on many front doors)
Often seen on timber doors with a rim-mounted latch and key cylinder.
Correct backset and fitting position
Correct cylinder tail length (so key operation stays reliable)
Door thickness and internal clearance
Picking an operation style that suits daily use
If you actually need replacement, not a change
If the lock hardware is damaged, compromised, or failing internally (beyond a clean access reset), you may need a full like-for-like hardware swap. In those cases, see door lock replacement.
We regularly carry out lock changes across the wider Bow area, supplying fresh keys and renewed security with same-day service.
Locksmith services
Business lock changes and key control
If you need lock changes across offices, shutters, staff entrances, or several doors on one site (including planning keyed-alike or structured access), see commercial locksmiths.
Need a locksmith in Bow now?
020 3468 8505Pricing
What affects the cost of a lock change
Lock change pricing comes down to practical factors, such as:
Lock type (euro cylinder, mortice, nightlatch, etc.)
Security level of the lock you pick
Number of locks being changed
Door type and access constraints
Time needed to confirm smooth operation (alignment and keep engagement checks)
Locksmith services
How to prepare for your lock change appointment
Let us know the door type (uPVC/composite/timber, if known)
Note any symptoms (stiff key turn, handle lift required, door catching)
Confirm how many locks you’d like changed (front door only vs multiple doors)
Decide whether you want keyed alike (one key for multiple locks) where compatible
Make sure we can reach both sides of the door (where applicable)
What to expect
Aftercare: keeping your new lock working smoothly
Avoid forcing the key—if anything feels off, stop and check the door is fully closed
Don’t let the door drop or scrape (misalignment shortens lock life)
Keep keys in good condition (bent keys wear locks down over time)
If the door faces the weather, keep the lock area clean and dry
Good to know
Lock change FAQs
Can you change a lock without changing the whole door?
Yes—most lock changes are purely hardware. What counts is picking the correct lock for your existing door setup and fitting it properly.
Should I change locks when moving into a new home?
It’s strongly advised. You can’t know who holds keys, how many copies exist, or whether keys were shared in the past.
Can I have the same key for multiple doors?
In many cases, yes (it depends on the lock types and compatibility). If you’d like keyed alike, mention it when booking.
How long does a lock change take?
Many lock changes are quick once the correct lock is chosen and properly sized. More complex doors or multiple locks will take longer, particularly where the door has to be tested for smooth, repeatable locking.
Will the new lock feel stiff at first?
It shouldn’t. A properly fitted lock ought to turn smoothly. If it feels stiff, that usually points to a fitting or alignment issue that should be put right.
Locksmith services
Book a lock change in Bow
If you need a clean, professional lock change—carried out with correct sizing, correct fitting, and proper testing—get in touch with E3 Locksmiths Bow. We’ll change your lock properly so you can lock up with confidence and stop worrying about who might still hold a key.