1 Star vs 3 Star Euro Cylinder: Which Do You Need?

If you’ve been looking at replacement euro cylinders you’ve probably noticed the little gold star ratings on the packaging — one star, two stars, three stars. It’s not marketing fluff. The star rating tells you how resistant that cylinder is to snapping, picking, drilling and bumping, and it directly affects whether your door meets the security standard most home insurers now expect. Here’s what the ratings actually mean, and how to work out which one your door needs.

What the TS007 star rating actually tests

TS007 is the British Standards Institution kitemark scheme for euro cylinders, introduced after lock snapping became a common way to force uPVC and composite doors. A cylinder is tested against attack methods including snapping, picking, drilling, bumping and physical manipulation, then rated:

• 1 star — a basic cylinder with some anti-pick and anti-drill protection, but limited resistance to snapping.
• 2 star — enhanced resistance, sitting between the two.
• 3 star — the highest rating, with full anti-snap protection built into the cylinder itself.

You’ll usually see the rating stamped on the cylinder face or printed on the box as “1★”, “2★” or “3★” alongside the TS007 kitemark.

The 1-star-plus-2-star-handle combination

Here’s the part that catches a lot of homeowners out: a 1-star cylinder paired with a 2-star security handle also meets the TS007 3-star equivalent standard. The handle’s reinforced escutcheon shields the exposed part of the cylinder, so even though the cylinder itself is only rated 1-star, the combination as a whole resists snapping just as well as a 3-star cylinder on its own.

This matters because it gives you options:

• Cheapest route: keep your existing handle, fit a 3-star anti-snap cylinder.
• Combination route: fit a 1-star or 2-star cylinder with a certified 2-star handle.
• Belt and braces: fit a 3-star cylinder and a 2-star handle together — the most secure option, and increasingly what we recommend on doors that have been targeted before.

What doesn’t count is a 1-star cylinder with a standard, non-rated handle. That combination has none of the anti-snap protection and is exactly the setup burglars look for on uPVC doors.

Why lock snapping made this necessary

Standard euro cylinders have a weak point at the screw fixing in the middle, roughly where the cylinder sits flush with the handle. A sharp strike with a wide-bladed screwdriver or similar tool can snap the cylinder clean at that point in seconds, giving direct access to the internal mechanism without needing to pick or drill anything. It’s quiet, quick, and for years it was the single most common way uPVC doors were forced.

Anti-snap cylinders are designed with a sacrificial section that snaps away cleanly while leaving the working part of the lock intact and undamaged, so the door stays secure even after an attempted attack. That’s the core difference a 3-star rating buys you.

Which one do you actually need?

For most homes with a uPVC or composite front or back door, we’d recommend:

• A 3-star anti-snap cylinder as standard, particularly on doors visible from the street or a side passage.
• A 2-star security handle as well if the door is on a ground floor, faces a public path, or has been targeted before.
• Checking the length carefully — a cylinder that protrudes even a few millimetres beyond the handle gives an attacker something to grip and lever, regardless of its star rating. Cylinders should sit flush or very slightly proud, measured from both sides of the door.

A 1-star cylinder on its own is rarely the right choice for an external door today, even on a quiet street. It’s more commonly found on internal doors, outbuildings, or older stock that hasn’t been upgraded — and even then, we’d generally suggest replacing it as a straightforward, low-cost upgrade during any other lock work.

The insurance angle

Most UK home insurance policies specify minimum lock standards for external doors as a condition of cover, and increasingly that means BS3621 for mortice locks on timber doors, and TS007 3-star (or the 1-star-plus-2-star-handle equivalent) for euro cylinders on uPVC and composite doors. If a claim follows a break-in and the locks fitted don’t meet the policy’s stated standard, insurers can — and do — reduce or refuse payouts.

It’s worth pulling out your policy document and checking the wording, rather than assuming. Some insurers list BS3621 only and don’t mention TS007 at all, which usually means any euro cylinder is technically acceptable, but a 3-star cylinder is still the sensible upgrade given how common lock snapping remains.

Checking your current cylinder

You don’t need to remove anything to get a rough idea of what you’ve got:

• Look at the cylinder face (the part visible on the edge of the handle) for a stamped star rating or the TS007 kitemark.
• If there’s no rating visible at all, it’s likely an older, unrated cylinder and worth reviewing.
• Measure how far the cylinder sits proud of the handle on both sides of the door — anything more than 2-3mm should be addressed regardless of the star rating.

If you’re not sure what you’re looking at, sending a photo to a locksmith is usually enough for them to tell you what you’ve got and what it would cost to upgrade.

When to call a locksmith

Swapping a euro cylinder is one of the most cost-effective security upgrades you can make to a uPVC or composite door, and it’s usually a quick job once the correct size is confirmed. Our lock replacement and upgrades service covers exactly this — measuring your door correctly, fitting a 3-star anti-snap cylinder (with a matching security handle if you want the belt-and-braces option), and checking the rest of the door’s security while we’re there.

Max covers Nottingham, Derby, Mansfield, Loughborough and the surrounding towns and villages — £85 plus parts if any are needed, no call-out fee, and the same price wherever you are in the coverage area. Most upgrades are completed on the first visit, with the price agreed before any work starts. If you’ve had a break-in and need locks assessed or replaced urgently, our after burglary service and emergency locksmith team can attend quickly.

Frequently asked questions

What’s the difference between a 1-star and 3-star euro cylinder?
A 3-star cylinder has full anti-snap protection built in and offers the highest resistance to snapping, picking, drilling and bumping under the TS007 test. A 1-star cylinder has only basic protection and limited snap resistance unless it’s paired with a 2-star security handle.

Does a 1-star cylinder with a 2-star handle really work as well as a 3-star cylinder?
Yes — this combination is a recognised equivalent to a standalone 3-star cylinder, because the handle’s reinforced escutcheon protects the exposed part of the cylinder from being snapped. A 1-star cylinder with a standard handle does not offer the same protection.

Will my insurance be affected if I have the wrong cylinder?
Possibly. Many insurers specify minimum standards for door locks, and if a break-in occurs through a lock that doesn’t meet the policy’s requirement, a claim can be reduced or refused. Check your policy wording and upgrade if you’re unsure.

How do I know what star rating my current cylinder has?
Check the face of the cylinder for a stamped rating or the TS007 kitemark. If there’s nothing visible, it’s likely an older, unrated cylinder worth having assessed.

How much does it cost to upgrade to a 3-star cylinder in Nottingham?
Max charges £85 plus parts if any are needed, with no call-out fee and the same price across the coverage area. Most upgrades are done on the first visit.

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Related: Lock Replacement & Upgrades · uPVC & Door Lock Repair · After Burglary Service