High Security Door Locks

The Weak Point Is Usually the Cylinder

Most uPVC and composite doors are fitted with a basic euro cylinder when they go in — and a basic cylinder is the single easiest thing on your home to defeat. Lock snapping is exactly what it sounds like: a burglar grips the cylinder, snaps it, and is through a front door in seconds, no noise and no specialist tools. The door, the frame and the multipoint mechanism can all be sound while that one cheap part lets the whole thing down. Upgrading it is the biggest single security win most homes can make.

Signs you're overdue an upgrade:

• The cylinder sticks out past the handle — easy to grip and snap
• It's the original lock fitted when the door was installed
• There's no anti-snap line or star marking on the face
• You've just moved in and can't account for every key
• There's been a break-in, or an attempt, on your street
• Your insurer has asked for a British Standard or kitemarked lock

What the Ratings Actually Mean

The security world is full of badges, so here's what the ones that matter mean in plain English. TS007 3-Star is the kitemark to look for on a euro cylinder — a 3-star cylinder is built to beat the methods burglars actually use: snapping, drilling, picking and bumping, all on its own.

Sold Secure Diamond is the Master Locksmiths Association's top testing tier; the best-known cylinders, such as Avocet ABS and Ultion, carry it. Secured by Design is the UK police's "preferred specification" scheme, so an SBD product has been through police-backed testing. And BS3621 is the British Standard most insurers want on timber external doors — a kitemarked mortice deadlock or sashlock.

The High-Security Locks We Fit

We fit branded, properly accredited hardware — never an unmarked cylinder off an online marketplace:

• TS007 3-Star anti-snap euro cylinders for uPVC, composite and aluminium doors
• Sold Secure Diamond cylinders — Avocet ABS, Ultion and similar
• BS3621 mortice deadlocks and sashlocks for timber doors
• Keyed-alike sets — one key for your front and back doors
• Thumbturn cylinders for quick exit in a fire
• Patio and sliding-door security bolts
• Handle and multipoint upgrades where the whole door needs to reach a 3-star rating

Anti-Snap, in Plain Terms

A proper anti-snap cylinder is designed to snap in a controlled place if it's attacked, leaving the working part of the lock intact behind a hardened section — so even if someone snaps the outside, the door stays locked and you can still open it normally from inside. The good ones add anti-drill, anti-pick and anti-bump protection in the same barrel. Best of all it's a straightforward retrofit: in most cases we simply measure your door, remove the old cylinder and fit the new one, with no need to change the whole mechanism.

What an Upgrade Costs

No call-out fee, ever, and a fixed price before we start — labour, the lock and VAT included. A single anti-snap cylinder upgrade is one of the most affordable improvements you can make to your home's security, and doing the front and back together with a keyed-alike set is usually only a little more. Our price guide shows honest UK ranges, and our guides to anti-snap locks and BS3621 explain the standards in more depth. If you're weighing this up after a scare, how burglars actually break in is worth a read.

Will a high-security lock meet my insurance requirements?

If your policy specifies BS3621 or a kitemarked lock, the locks we fit meet it — and we'll tell you exactly what's been installed so your cover stays valid.

Can I keep one key for both doors?

Yes — a keyed-alike set means your front and back cylinders run on a single key, which is both convenient and easy to manage.

Is an anti-snap cylinder a big job?

Not at all. For most doors it's a quick retrofit done in minutes once we've measured, with no change to the rest of the door.