Which Lock Type Does Your South London Home Need?
South London's housing stock spans over a century of construction — Victorian terraces in Norbury and Thornton Heath, Edwardian semis in Purley and Sanderstead, 1960s council builds in Croydon, and modern new-build composites across the CR and SM postcode belt. Each door type needs a specific lock, and fitting the wrong one means your home insurer may decline a burglary claim.
The 14 lock types below are the most common in residential and commercial properties across SW, SE, CR, SM and BR postcodes. Each page covers what the lock does, which doors it suits, its BS3621 or TS007 security rating, and typical fitting costs. Not sure which applies to your door? Call us for a free security check — we'll tell you exactly what's fitted and whether it satisfies your insurer.
For door-specific options, see our guides on door locks by material and high-security upgrades. Smart lock fitting is covered separately.
Insurance Compliance
Does your lock satisfy your insurer?
uPVC door
TS007 3-star cylinder — insurer approved
Wooden door
BS3621 5-lever mortice — insurer approved
Composite door
Multi-point + anti-snap — check your policy
Standard euro cylinder
No TS007/BS3621 rating — claim likely declined
All Lock Types — South London
Select your lock type for full details, security ratings, door compatibility, and fitting costs.
Yale Lock
Rim CylinderStandard spring-latch lock found on millions of UK front doors. Convenient but needs pairing with a deadlock for insurance compliance.
View Yale Lock detailsNight Latch Lock
BS3621 AvailableAutomatic deadlocking variant of the Yale lock. British Standard versions meet insurance requirements and resist forced entry better than basic latches.
View Night Latch detailsRim Lock
Older PropertiesTraditional surface-mounted lock common in pre-1960s South London terraces. Often upgraded when modernising Victorian and Edwardian doors.
View Rim Lock detailsDeadlocking Night Latch
Insurance RatedAn upgraded night latch that deadlocks automatically when the door closes. Preferred by insurers over basic spring latches for front door security.
View detailsEuro Cylinder Lock
Most Common uPVCThe standard lock in uPVC and composite doors across South London. Must be anti-snap rated — unprotected cylinders are the most common break-in target in CR and SW postcodes.
View Euro Cylinder detailsAnti-Snap Cylinder Lock
TS007 3-StarDesigned to break safely at the sacrificial point when snapped, leaving the lock mechanism intact. The recommended upgrade for all uPVC doors in South London.
View Anti-Snap detailsAnti-Bump Cylinder Lock
Pick ResistantResists bump key attacks — a method that opens standard pin tumbler locks in seconds. Often combined with anti-snap protection for full cylinder security.
View Anti-Bump detailsThumb Turn Cylinder
Emergency ExitOpens from inside without a key — critical for fire escape routes. Common in flats and HMOs across South London where building regulations apply.
View Thumb Turn detailsDouble Cylinder Lock
Key Both SidesRequires a key from both inside and outside — maximum security for glazed doors, but must comply with fire exit regulations in rented properties.
View Double Cylinder detailsMortice Lock
Wooden DoorsFitted into a pocket cut into the door edge. The standard lock for wooden front doors in South London's Victorian and Edwardian housing stock.
View Mortice Lock details5 Lever Mortice Lock
BS3621 StandardThe British Standard BS3621 lock for wooden doors. Required by most UK home insurers as the main deadlock on entry doors. Five levers provide far greater pick resistance than 2 or 3-lever versions.
View 5 Lever details3 Lever Mortice Lock
Internal DoorsSuitable for internal doors and low-security applications. Not insurance-approved for front doors — if this is your main entry lock, it needs upgrading to a 5-lever.
View 3 Lever detailsMortice Deadlock
Lock OnlyA lock-only mortice with no handle — purely for deadlocking. Often fitted as a secondary lock alongside a night latch on wooden front doors across South London.
View Mortice Deadlock detailsMortice Sash Lock
Handle + LockCombines a deadlock bolt and a spring latch in one unit — the most common all-in-one solution for wooden front and back doors across South London.
View Mortice Sash Lock detailsWhich Lock Does Your Door Need?
No competitor in South London has written this table. Match your door type to the right lock — and check the insurance column before you buy.
| Lock Type | Door Type | Security Rating | Insurance Approved | Typical Cost (fitted) |
|---|---|---|---|---|
| 5 Lever Mortice Lock | Wooden front/back doors | BS3621 ✓ | ✓ Yes | £120 – £180 |
| Anti-Snap Euro Cylinder | uPVC & composite doors | TS007 3-Star ✓ | ✓ Yes | from £200 |
| Mortice Sash Lock | Wooden front doors | BS3621 (5-lever) | ✓ If 5-lever | £130 – £190 |
| Night Latch (BS) | Wooden front doors | BS3621 ✓ | ✓ BS version | £100 – £160 |
| Yale Lock (basic) | Wooden front doors | No rating | ✗ Alone | £75 – £110 |
| 3 Lever Mortice Lock | Internal doors only | No BS rating | ✗ Front door | £85 – £130 |
| Standard Euro Cylinder | uPVC & composite doors | Snap risk | ✗ Upgrade needed | £75 – £120 |
Prices are typical South London fitted costs including parts and labour. Exact quote provided on arrival — no hidden fees.
Why South London Chooses Us
Only BS3621 & TS007 Locks Fitted
Every lock we supply is rated BS3621 or TS007. We won't fit one that doesn't satisfy your insurer. No exceptions.
30-Minute Response Across South London
We cover all SW, SE, CR, SM and BR postcodes. Emergency or planned — same fast response.
Free Security Audit Included
Every job includes a free check of all entry points — not just the one we're working on. We'll tell you exactly what's at risk.
Fixed Prices — No Call-Out Fee
Price agreed before work starts. No surprises on the invoice. No call-out charge regardless of time or day.
DBS Checked Locksmiths
Every engineer is DBS cleared and carries photo ID. They arrive in uniform. When you're letting someone into your home, that's not a small thing.
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Frequently Asked Questions
Lock Fitting Across South London
Full coverage: all SW, SE, CR, SM and BR postcodes — 24 hours a day, 7 days a week.
Not Sure Which Lock You Need?
Call us and describe your door — we'll tell you exactly which lock meets your insurer's requirements. Free advice, no obligation.
24/7 emergency locksmith serving South London since 2015 — trusted by homeowners, landlords and businesses across Sutton, Mitcham, Wallington, Cheam, Purley and surrounding areas.