If you have a uPVC or composite door — which covers the majority of homes built or fitted with new doors in the last 25 years — there's a reasonable chance your lock is vulnerable to an attack method called lock snapping. It's the single most common technique used by burglars to break into homes across the UK, and it requires no skill, no specialist tools, and takes less than a minute. Understanding it is the first step to protecting against it.
What Is Lock Snapping?
Most uPVC and composite doors use a euro cylinder lock — the oval-shaped barrel your key goes into, typically located in the centre of the door handle. A standard euro cylinder is made in two halves, joined at a weak point in the middle. This design was originally functional but creates a significant security flaw: if you apply enough lateral force to the part of the cylinder that protrudes beyond the door handle, the cylinder snaps at that weak point.
Once snapped, the remaining section of the cylinder can be rotated with a flat tool — a screwdriver, a coin, sometimes just a finger — to open the door. The whole process can take as little as 15 to 30 seconds and is virtually silent. No forced entry. No broken windows. Just a snapped cylinder and an open door.
The technique became widespread in the UK during the 2000s as uPVC doors became the dominant door type. By the 2010s it was the most reported method of domestic burglary entry in many parts of the country, including the West Midlands.
How to Tell If Your Cylinder Is Vulnerable
Stand outside your front door and look at the cylinder. The key question is: how much of it protrudes beyond the door handle?
- If the cylinder sits flush with the handle, or protrudes by only a millimetre or two, it offers some natural resistance to snapping because there's nothing to grip
- If the cylinder protrudes noticeably beyond the handle — 5mm or more — it gives an attacker something to grab onto and apply the lateral force needed to snap it
Beyond protrusion, the cylinder itself matters. Older or budget cylinders typically have no internal reinforcement at the snap point. Anti-snap cylinders are specifically engineered so that if forced, only the outer section snaps — and that section separates from the internal mechanism, leaving the lock intact and the door still secure.
If your door is more than around eight years old and the cylinder hasn't been upgraded, assume it's a standard cylinder and treat it accordingly.
What Does an Anti-Snap Cylinder Look Like?
An anti-snap cylinder will typically be marked with a star rating under the TS007 standard — one, two, or three stars, with three stars being the highest. On a genuine three-star cylinder you'll usually see "3★" or "TS007" stamped on the face of the cylinder, visible when the door is open. Some also carry the BSI Kitemark.
If you can't see any marking, or if the cylinder has no visible branding at all, it's almost certainly a basic cylinder with no anti-snap protection.
One cylinder or three? The TS007 three-star rating can be achieved by a single certified cylinder, or by combining a one-star cylinder with a two-star door handle (which includes a cylinder guard). Both are valid, but a single three-star cylinder is the simplest upgrade — one component, fitted in under an hour.
How Much Does It Cost to Upgrade?
Upgrading to a BSI 3 Star TS007 anti-snap cylinder is one of the most cost-effective security improvements you can make. At AMP Lock, a three-star cylinder costs £45 fitted — including labour. For the level of protection it provides against the most common burglary method in the UK, it represents excellent value.
Most upgrades are done in a single visit of under an hour. The cylinder is swapped out directly, the door and handle stay unchanged, and you walk away with new keys and a certified, tested level of resistance.
Does It Affect My Insurance?
Possibly, and not in a good way if you don't have one. Many home insurance policies specify cylinder locks that meet minimum security standards — either TS007 three-star or equivalent — as a condition of cover. If your home is broken into via a snapped cylinder that didn't meet the specified standard, your insurer may contest the claim.
Check your policy documents for any reference to lock standards on external doors. If you're in any doubt, a quick phone call to your insurer will confirm what they require. If they specify anti-snap or TS007, that's the minimum worth fitting.
Protect Your Home in Stourbridge
AMP Lock covers Stourbridge (DY8), Halesowen, Dudley, Kingswinford, Hagley, Kidderminster, and all surrounding areas. If you want your cylinder checked or upgraded, call or WhatsApp on 07961 169 681. We carry certified anti-snap cylinders as standard stock and can carry out the upgrade on the same visit. No call-out fee, price confirmed before we start.