uPVC Door Lock Guides: Measure, Fix & Choose
Everything you need to replace or upgrade the locks on a uPVC or composite door: how to measure a euro cylinder, what TS007 3-star means, how to spot a failing gearbox, and how to get one key for every door. Written by the Home Secure team at our Liverpool trade counter, an Avocet ABS Elite Centre.
Most-read Door Locks & Keys guides
All Door Locks & Keys guides
Measure & identify
Fix a problem
Choose what to buy
- How to Get the Same Key for All Your Doors
- How Burglars Break Door Locks (And How Modern Locks Stop Them)
- Are High Security Door Locks Worth It? Pros, Cons & Real-World Use
- What Makes a Door Lock Insurance Approved in the UK?
- Best High Security Door Locks for UK Homes (2026 Buyer’s Guide)
- How Secure Are Push Button Door Locks? Codes, Tamper Risks & Best Practices
- Why Landlords Should Upgrade to High-Security Euro Cylinders in All Rentals
- Avocet ABS Black X: What Makes This Smart Lock Range Stand Out?
- Why Choose a BS 3621 5-Lever Deadlock? | Benefits of the ERA Fortress Lock
- TS007 3-Star Euro Cylinders: What the Rating Means and Which to Buy
- Home Secure™ Digital Push Button Lock Review — Affordable Keyless Security
- How Much Does It Cost to Get a Key Cut? Prices from £2.80 (2026)
- Yale Euro Cylinder Locks - Grip Deflector Information
- ABS Euro Locks in Liverpool – TS007 3-Star Anti-Snap Cylinders
- uPVC Door Locks Liverpool
- Beginners Guide to uPVC Door Locks
- What Does Keyed Alike Mean? One Key for All Your Doors
- Types of Cylinder Locks
- What is a 5 Lever Mortice Lock?
Parts from these guides
Avocet ABS High Security Euro Cylinder - Anti Snap Lock - TS007 3 Star – Anti Snap – uPVC & Composite Doors£44.99
Yale Euro Cylinder Door Lock Platinum TS007 3* Star – Anti Snap – uPVC & Composite Doors£29.99+
Keypad Door Lock | Home Secure™ Digital Push Button Lock – Mechanical Keyless Entry – No Battery Required£29.99
Quick answers
How do I measure a euro cylinder lock?
Measure from the centre of the fixing screw on the edge of the door to each end of the cylinder, and write it as internal × external, for example 40 × 50mm. Sizes go up in 5mm steps, and more than 4 in 10 of the cylinders we sell are a different length on each side, so always measure both.
Read the guide: How to Measure a Euro Cylinder Lock (UK Size Guide)
What does TS007 3-star mean?
TS007 is the UK Kitemark standard for euro cylinders and door handles, tested against snapping, drilling and picking. You need 3 stars in total on the door: a 3-star cylinder gets you there on its own, while a 1-star cylinder needs a 2-star security handle as well.
Read the guide: TS007 3-Star Euro Cylinders: What the Rating Means and Which to Buy
Why is my key hard to turn?
Turn the key with the door open. If it's easy, the door has moved and needs adjusting; if it's still stiff, puff a little graphite powder into the keyhole and work the key back and forth. Don't use WD-40 or oil, which collects dust and makes the lock stiffer over time.
Read the guide: Key Hard to Turn in Your Door Lock? Causes and How to Fix It
How do I know if my uPVC door gearbox is failing?
Signs are a floppy or drooping handle, a handle that's getting harder to lift, a key that turns but doesn't lock, and clicking or grinding inside the door. Test with the door open first: if everything works smoothly then, the door is out of line, and that needs fixing before a new gearbox.
Read the guide: Signs Your uPVC Door Gearbox Is Failing (and the 30-Second Test)
Can I get one key for all my doors?
Yes. You can't cut one key to fit your existing locks, but you can swap the lock barrel in each door for a matching set that shares one key. It's called keyed alike, and each barrel takes about 10 minutes to fit with a screwdriver.