Lock snapping is one of the most common ways burglars get through uPVC doors in the UK. Here's how it works, how to check whether your home is at risk, and what an upgrade involves.
Most uPVC and composite doors lock with a euro cylinder — the barrel your key goes into. A standard euro cylinder is held in place by a single fixing screw, and it protrudes a few millimetres either side of the handle. With basic tools and a lot of force, a burglar grips that exposed cylinder, snaps it at the fixing point, and the lock simply comes apart — giving access to the mechanism in seconds. No skill required, which is exactly why it's so common.
If your uPVC or composite door has a standard euro cylinder — the flat, keyhole-shaped barrel with a keyhole on each end — and it protrudes more than a few millimetres beyond the handle, it's potentially vulnerable. The risk isn't about the door's quality; it's about the cylinder. Many perfectly good doors across South Yorkshire are fitted with basic cylinders that offer almost no snapping resistance.
Anti-snap cylinders are engineered with deliberate sacrificial break points. When force is applied, the outside section snaps away exactly where the manufacturer intended — but the locking mechanism inside stays intact and the door stays locked. Quality is graded under the TS007 standard, from 1-star up to 3-star, which also covers attack resistance beyond snapping.
Take a close look at your cylinder with the door open if possible. Does it stick out noticeably beyond the handle? Does it show a Kitemark or star rating stamped on the end? If you can't see any markings, it's likely a basic cylinder. A locksmith can assess it in minutes — at SIDE we'll tell you honestly whether an upgrade is actually needed, and we won't replace a lock that doesn't need replacing.
Replacing a euro cylinder is a quick, non-disruptive job — usually under half an hour per door. You choose the replacement cylinder, and the price depends on the rating you go for. If your door is otherwise in good condition, an anti-snap cylinder is one of the highest-value security upgrades you can make — far cheaper than dealing with a break-in.
A cylinder is strongest working alongside other measures: a security handle that protects the cylinder from being gripped, a properly adjusted multipoint mechanism, and a correctly sized cylinder that doesn't protrude. Getting the cylinder length right matters as much as the rating — an oversized 3-star cylinder can still give an attacker something to grip.
If your cylinder sticks out more than 3mm past the handle, ask about the correct size.
Look for a TS007 star rating or Kitemark stamped on the cylinder.
Upgrade after a break-in even if the lock survived — burglars often return to repaired doors.
Call SIDE for honest advice and fast response across South Yorkshire.