Security Lock Services
Your lock has probably never been tested. That's the problem.
Standard euro cylinders — fitted to the majority of uPVC doors in South London — can be snapped in under 60 seconds using tools available on any hardware site. No noise, no broken windows, nothing to suggest forced entry. Your insurer may not pay out if the lock didn't meet BS3621 or TS007 standards.
We cover every layer of cylinder and deadlock security: anti-snap cylinders that sacrifice a breakable section to protect the cam, anti-pick pins that resist manipulation, anti-bump mechanisms that defeat impact attacks, and hardened steel cores that defeat drilling. The pages below cover each upgrade type in full — what it protects against, what it costs and which doors it fits.
Not sure where your current lock sits? Call us — we'll assess it from a photo and tell you whether it's snap-vulnerable before sending anyone out. That assessment costs nothing.
Security Lock Pages
Choose your security upgrade
Each page covers one lock security type — what it does, what it costs, and which doors it fits.
Anti-Snap Locks
Cylinders with a sacrificial section that breaks before the cam — leaving the lock still working and the door still secure. TS007 3-star rated.
View Anti-Snap Locks →Anti-Bump Locks
Bump-resistant pin stacks that defeat impact attacks. Fitted alongside anti-snap protection for complete cylinder security.
View Anti-Bump Locks →Anti-Pick Locks
High-security pin configurations that resist raking and picking tools. For properties where security needs to go beyond snap protection.
View Anti-Pick Locks →Drill Resistant Locks
Hardened steel cores and anti-drill plates that defeat power drill attacks. Typically part of a TS007 3-star cylinder specification.
View Drill Resistant Locks →BS3621 Locks
The British Standard most UK home insurers require on front doors. We supply and fit BS3621 Kitemark mortice deadlocks and TS007 equivalents.
View BS3621 Locks →Insurance Approved Door Locks
Which locks satisfy which insurers, and how to prove it. We provide a compliance certificate with every qualifying installation.
View Insurance Approved Locks →British Standard Locks Explained
What BS3621 and TS007 actually mean, which locks qualify, and how to check if your door meets insurer requirements before a claim.
Read the Guide →Why South London Chooses Us
For security upgrades specifically, these details matter.
TS007 3-Star — the Floor, Not the Ceiling
We only fit TS007 3-star cylinders — not 1-star or 2-star. Three-star means anti-snap, anti-pick, anti-bump and anti-drill all in one cylinder.
Compliance Certificate Included
Every security upgrade comes with written confirmation of the lock standard fitted. Your insurer gets what they need; you have proof on file.
Snap-Proof Within the Hour
We carry Ultion, Avocet ABS and Yale Platinum cylinders in the van. Most anti-snap upgrades are done in a single visit — no parts wait.
Free Security Assessment
We assess your current lock vulnerability from a photo — at no charge. You only pay when we arrive and upgrade the lock.
Fixed Price Before We Start
You get the price on the phone. No call-out fee, no surprise labour charge once we're in front of your door.
DBS Checked, ID-Carrying Engineers
For a security upgrade, you need to trust who's at your door. Every engineer is DBS cleared and carries photo ID on every call.
4.9★ — 155 Google Reviews
Unfiltered reviews from South London homeowners. Read them on Google — we don't cherry-pick or moderate.
12-Month Parts Guarantee
Every lock we fit is guaranteed for 12 months on parts. Anything fails in that window — we return and replace it, no charge.
No Subcontractors
The engineer who picks up is the one who shows up. We don't outsource to freelancers. Your address and security stay with us.
Security upgrades, as customers describe them
Called after my neighbour had a break-in — turned out our lock was exactly the type that got snapped. They came out within two hours, assessed it on the spot and upgraded to an Ultion cylinder. Whole job took under 45 minutes. My insurer confirmed it's compliant — the certificate they gave us made that straightforward.
Paul H.
Tooting · Ultion anti-snap upgrade
My home insurance renewal asked for proof of a BS3621 mortice lock on the front door — I had no idea what that meant. The locksmith explained it clearly on the phone, confirmed which lock I needed, and came out the same afternoon. Fitted a Chubb 3G114 and gave me a letter for the insurer. Exactly what I needed, done efficiently.
Fatima A.
Croydon · BS3621 mortice deadlock
Sent a photo of my existing cylinder and they told me straight away it was snap-vulnerable — the barrel was sticking out about 5mm beyond the door furniture. Booked the same day, Avocet ABS fitted, and they checked the rest of the door while they were there. Good honest service, no upselling.
Marcus L.
Mitcham · Avocet ABS anti-snap
Security lock questions answered
Call us if yours isn't here — we'll tell you exactly where your lock stands in 60 seconds.
Also serving across South London
Is your current lock snap-vulnerable?
Send us a photo and we'll tell you on the call. If it needs upgrading, we'll have a TS007 3-star cylinder fitted the same day.
Free assessment · No call-out fee · TS007 3-star fitted same day
24/7 emergency locksmith serving South London since 2015 — trusted by homeowners, landlords and businesses across Sutton, Mitcham, Wallington, Cheam, Purley and surrounding areas.