How to reinforce your door to prevent squatters

Quick answer: to prevent squatters, reinforce the door with a high-security lock, an anti-bump cylinder with an armoured escutcheon and an extra security deadbolt. For empty homes, add a phone-controlled lock or an alarm without monthly fees. It's all 100% legal and far cheaper than an eviction.

Squatting is one of the biggest fears for anyone with an empty home or a second residence on the Costa del Sol. And rightly so: once someone is inside, getting your home back can take months of paperwork and money. The good news is that most squatting can be prevented at the door, before it happens. Here's how, without giving anyone tips.

Why your door is your best defence

Squatters look for the easy target: a home that seems abandoned and has a simple lock that gives way quickly and quietly. The harder, noisier and slower your door is to force, the less attractive you are as a target. The trick isn't an impossible-to-open door, but making getting in cost too much so they look elsewhere.

Besides, a well-reinforced door has a second advantage: if someone tries to force it, it leaves visible signs of break-in, which makes reporting it and police action easier within the first hours, which are decisive.

The 5 measures to reinforce your door

You don't need all of them; combine them to your case (main home or empty house). From least to most protection:

• 1. Anti-bump cylinder + armoured escutcheon. The cylinder is the most attacked point. A high-security cylinder with an armoured escutcheon stops bumping, picking, drilling and extraction.
• 2. High-security lock. If your lock is old or single-point, replace it with a multi-point one anchored to the frame.
• 3. Extra security deadbolt. A deadbolt with a hardened steel bolt adds an independent second locking point. Very effective and affordable.
• 4. Anti-pry plate. Reinforces the area between door and frame, where most force is applied. Especially useful on wooden or old doors.
• 5. Invisible or smart lock. For empty homes, a phone-controlled lock or an invisible lock with no external cylinder (nothing to manipulate from outside) is the most advanced solution.

Second homes and empty properties

The Costa del Sol is full of flats and villas that stay empty for months —in Calahonda, La Cala, Riviera del Sol or Elviria—. They are the preferred target, because nobody is watching. If that's your case:

• Simulate presence: ask a neighbour to collect the post, leave a light on a timer and don't announce online that the house is empty.
• Maximum-security lock: an invisible or high-security lock is ideal when the home will be alone for a long time.
• Alarm with alerts: an alarm without monthly fees notifies your phone of any attempt, wherever you are.
• Check the door before low season: better to reinforce in September than to regret it in January.

Is it legal to reinforce my door against squatters?

Yes, absolutely. Reinforcing, changing or armouring the lock of your own home is completely legal and, in fact, the sensible thing to do. The law protects your right to protect your property. What the law regulates is what can be done once someone is already inside —which is why acting beforehand, at the door, is the smart move. Also, many insurance policies require minimum security measures and value high-security locks.

Anti-squatter locksmith in Mijas and Marbella

At S1 Cerrajeros we advise on and reinforce doors against squatting across the Costa del Sol, adapting the solution to your case: main home, rental flat or empty second residence. Price fixed over the phone, invoice and warranty. We are APFC-certified locksmiths. Got a house that spends seasons empty? Tell us your situation and we'll tell you exactly what it needs —and what it doesn't.