Which door lock is most secure in the UK?
If you are looking for the strongest door lock for your home, the answer starts with the euro cylinder — the part that sits inside the door and accepts your key. In the UK, most uPVC and composite doors use a euro cylinder, and the one that has earned the strongest security rating is the **TS007 3-star lock**. It is not a brand name; it is a test standard set by the Master Locks Association, and a lock that passes it has been proven to resist snapping, drilling, picking and forced turning.
A TS007 3-star lock is the baseline for a secure home. Many insurance companies now recommend it, and some policies require it for certain types of cover. If your door has a non-compliant cylinder (one that snaps easily), you are leaving your home open to one of the most common break-in methods.
What is TS007 and the 3-star rating?
TS007 is a British Standard (BS 1359) that tests euro cylinders against three attacks:
- Snap resistance: the cylinder must not break when clamped and twisted — snapping is how most burglars force a euro cylinder open in under 30 seconds.
- Drill resistance: hardened pins inside the cylinder protect the locking mechanism from drill attacks.
- Pick and turn resistance: anti-pick pins and tension resistance make it much harder to manipulate with lock-picking tools.
The 3-star rating (a black star on each side of the lock when installed) is the highest TS007 rating. It means the lock has passed all three tests at the maximum level. Some locks carry a 1-star or 2-star rating, which means they have passed but to a lower standard.
Why anti-snap matters
Euro cylinders are designed with a weak point — the snap line. The cylinder is longer than the door needs, so the extra length is the part that does nothing (it sits in the frame, not the door). A burglar clamps this weak section in a vice and twists. The cylinder snaps at the weakest point, and the burglar can then turn the broken half to open the lock.
This is why anti-snap is the single most important feature. An anti-snap cylinder breaks at a designed line that does not reach the locking mechanism, so the burglar cannot turn it. A TS007 3-star cylinder is guaranteed to be anti-snap and tested to prove it. The LockGuard scheme (run by the MLA) also provides a free cylinder replacement if an anti-snap cylinder is broken during a break-in.
How to check if your current lock is secure
Look at the face of your euro cylinder (the part that surrounds the keyhole). A TS007 3-star lock has a black star on the left and a black star on the right — one on each side. If you see the stars, you have a compliant lock.
Without stars, the lock may still be secure, but you cannot be sure. Older locks, cheaper locks, and the locks that came fitted when the door was installed are the most likely to be non-compliant. If you cannot see the stars, or if your lock was installed before 2014 (when TS007 became the standard), it is worth having a locksmith check it.
Other signs that your lock may need upgrading:
- The lock feels loose or wobbly when you turn the key.
- The key sticks or needs jiggling.
- The door still opens if the handle is lifted while locked (a sign the bolt does not fully engage).
- The cylinder is the same length on both sides of the door (a very old design).
How much does a TS007 anti-snap cylinder cost?
A quality TS007 3-star euro cylinder costs between £40 and £120 for the lock itself, depending on the brand. A reputable locksmith will typically charge £60 to £120 for the fitting, bringing the total to roughly £100 to £220 for a full replacement.
That is often far cheaper than the cost of a break-in. The MLA LockGuard scheme adds value too: if your anti-snap cylinder is snapped during a forced entry, MLA provides a free replacement cylinder (one per break-in), which saves you the cost of the hardware when you need it most.
Avoid suspiciously cheap cylinders (under £20). They may look the part but often fail the TS007 tests or the stars are printed rather than machined (which means they will wear off). Always buy from a reputable supplier or ask your locksmith to supply a known-tested brand.
What other security features should I look for?
A TS007 3-star cylinder is the strongest single lock for a uPVC door, but additional features improve security further:
- Anti-drill: hard metal inserts that protect against drill attacks. All TS007 3-star locks are anti-drill, but it is worth confirming.
- Anti-pick: special pin configurations that resist picking. Again, included in TS007 3-star.
- Anti-bump: resistance to bumping (a technique using a specially cut key and tapping). Many TS007 locks also resist bumping, but not all — ask your locksmith.
- Smart lock compatibility: some TS007 cylinders can be fitted with a smart actuator on the interior side, giving you keyless entry without changing the whole lock.
- Multipoint locking: the cylinder is only one part of the lock system. A multipoint lock (3-5 bolts at different heights) is much stronger than a single bolt. The cylinder and the multipoint system work together.
Should I replace the whole lock or just the cylinder?
On a uPVC or composite door, you usually only need to replace the euro cylinder, not the whole lock mechanism. The cylinder is the only part the burglar needs to attack to open the door, and swapping it takes a trained locksmith about 10 minutes with no damage to the door.
You would only need a full lock replacement if:
- The door has an older lock type that is not a euro cylinder (some very old doors use mortice locks).
- The multipoint mechanism itself is damaged or worn.
- You are upgrading to a smart lock that replaces the entire system.
When should I get a locksmith to fit it?
A TS007 cylinder swap is a job for a trained locksmith. They need to measure your door thickness, choose the correct cylinder length (front and back projection), and ensure the lock works smoothly after fitting. A cylinder that is the wrong length can jam, and a poorly fitted one can be easier to attack.
A locksmith can also check the rest of your locking system — the bolts, handles, and frame — and advise whether any other upgrades are needed. See our guide to choosing a locksmith you can trust for tips on finding a reliable professional.
If you need a locksmith near you, search by your postcode to find local locksmiths with their rates displayed before you call.
Which towns have locksmiths that fit TS007 locks?
A TS007 3-star anti-snap cylinder is available from any competent locksmith across the UK. Popular search areas include London, Manchester, Birmingham and Liverpool — check the town pages for locksmiths in your area.
FAQ: TS007 locks
Is a TS007 lock legally required?
No, there is no law requiring a TS007 lock in a home. However, many insurance companies recommend or require it, and some may refuse a claim if the break-in was through a non-compliant cylinder. Check your policy or ask your insurer.
Do all doors use euro cylinders?
Most modern uPVC, composite and some wooden doors do. Older wooden doors may use a mortice lock (a different type). A locksmith can advise on your door type.
Can I fit a TS007 cylinder myself?
It is physically possible, but we recommend a professional. The correct length depends on your door, and a wrong-size cylinder can jam or leave gaps that compromise security. A locksmith measures correctly the first time.