When to change your cylinder? 5 signs and why a high-security cylinder matters

Quick answer: you should change the cylinder if you've lost your keys, just moved in, the key is hard to turn, there have been burglaries nearby or your cylinder is old. And when you change it, it's worth fitting a high-security anti-bump cylinder (from €70): it's the cheapest investment that best protects your door.

The cylinder is where you insert the key and, at the same time, the point most burglaries go through. Changing it in time — and for a good one — is the most effective and affordable way to protect your home. Here are the 5 warning signs you shouldn't ignore.

1. You have lost your keys

If you don't know where your keys are or they've been stolen, don't wait: someone could access your home. Changing the cylinder instantly cancels any copy that's out there.

2. You have just moved in

You don't know how many key copies the previous owners or tenants have, or who has them. A new cylinder is the first thing we recommend when moving into a home.

3. The key is hard to turn

If the key goes in with difficulty, sticks or the cylinder "grinds", the mechanism is worn. Better to change it calmly now than to get locked out on a bad day.

4. There have been burglaries in the area

After a break-in attempt in your neighbourhood, an anti-bump cylinder protects you against the most common techniques. It's a cheap, preventive measure that brings real peace of mind.

5. Your cylinder is old or basic

Old or low-end cylinders resist neither bumping nor drilling. If your door still has its original cylinder from years ago, it's worth modernising it.

The cylinder: the heart of your door's security

Here's the key point many people overlook: you can have an armoured door, but if the cylinder is basic, your security is basic. A great reinforced door is useless if the cylinder opens in seconds. So when you change the cylinder, don't settle for the cheapest one: choose one that truly protects.

What to look for in a high-security cylinder

• Anti-bump, anti-pick and anti-drill protection: it resists the three opening techniques burglars use most.
• Key-copy control card: nobody can duplicate your key without your ownership card. Essential if you rent out or if third parties have had your key.
• A certified brand: we work with Keso, M&C, Tesa, Cisa and Abus, cylinders that exceed European security standards.

New cylinder + escutcheon: the winning combination

The anti-bump cylinder protects against "fine" opening (picking, bumping, impressioning). But to also stop force attacks — drilling and extraction — the ideal is to add an armoured escutcheon (from €120). A high-security cylinder + escutcheon is the most complete physical protection for a door, fitted in the same visit, with no building work.

At S1 Locksmiths we advise you with no obligation on the cylinder that best fits your door and budget. We change it in minutes, with a fixed price over the phone, an invoice and a written guarantee.