How to Measure a Euro Cylinder Lock for Buying a Smart Lock
Planning to upgrade your home, rental, or Airbnb with a smart lock? Great choice! But before you click “buy,” it’s essential to check whether your door is compatible—and that starts with measuring your Euro cylinder lock correctly.
This guide walks you through every step so you can confidently choose the right smart lock that fits your Euro profile door, whether it's for a 30/30 mm cylinder, a wooden front door, or a rental property.
Step 1: What Kind of Cylinder Works with a Smart Lock?
WELOCK smart locks are compatible with Euro profile cylinders only. Other lock types like UK Oval, Knob, Armor, or Swiss Round cylinders will not fit.
If your cylinder matches the Euro profile shape above, you’re good to move on. If not, this smart lock likely won’t be compatible.
Step 2: Measure Your Door Thickness (Including Trim Cover)
Use a tape measure to check the total thickness of your door from front to back, including any trim plates or covers.
✅ WELOCK smart locks are compatible with doors with a thickness between 50 mm and 100 mm or 30 mm and 70 mm.
Tip: Most uPVC, wood, and aluminum doors in the UK and EU are within this range.
Step 3: Measure the Door Backset—From Keyhole to Door Edge
The backset is the distance from the center of the keyhole to the edge of the door. This needs to be ≥ 25 mm for the smart lock to fit and rotate properly.
A 40mm backset ensures smooth and secure operation of your lock.
Where Do People Use Smart Locks?
Smart locks aren’t just for tech-savvy homes—they’re now a go-to solution for:
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Airbnb hosts
Set temporary PINs/passwords; no need for key exchange. -
Rental properties
Control access remotely and eliminate lost keys. -
Family homes
Grant fingerprint or app access to family members. -
Home offices
Improve privacy and restrict access hours.
Smart Lock Features You May Want
Before you buy, check for the following features based on your use case:
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✅ Fingerprint unlock—no more lost keys
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✅ Keypad PIN codes—great for Airbnb or guests
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✅ App unlock + logs—track who entered
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✅ WiFi & Alexa integration—for full smart home access
WELOCK supports all of these with optional WiFi gateway（WELOCK WIFIBOX3）
Ready to Buy a Smart Lock That Fits?
Once you’ve measured your cylinder and door, you’re ready to shop!
FAQ:
1. What size Euro cylinder do I need for a smart lock?
Most smart locks fit Euro cylinders sized 30/30, 30/40, 35/35, or 40/40 mm. Always measure your existing cylinder before buying to ensure compatibility.
2. Which smart lock is best for Airbnb?
Smart locks with keypad or app access are ideal for Airbnb. WELOCK offers models that allow temporary PIN codes, remote control, and no monthly fees—perfect for hosts.
3. Can I install a smart lock on a uPVC or wooden door?
Yes, smart locks like WELOCK are compatible with uPVC, wooden, and aluminum doors that use Euro profile cylinders. Ensure your door thickness is between 30 and 100 mm.
4. Do I need a locksmith to install a smart lock?
No. Most smart locks for Euro cylinders, including WELOCK, are DIY-friendly. You can install them without drilling or calling a locksmith.
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