Electronic locks for homes and holiday rentals

Electronic locks have taken off for two reasons: no more keys and remote access management. In your own home they add convenience; in a holiday let they completely change check-in and check-out logistics. But not every lock suits every door — and many Spanish apartments have multi-point security doors (puertas blindadas) that rule out some models.

Types of electronic lock

Retrofit motor over the existing cylinder

A unit fitted on the inside that turns the key or thumb-turn. No change to the lock or door.

• Pros: simple, reversible installation; you keep your keys.
• Cons: security depends on the existing cylinder; opening from outside usually needs an extra keypad or reader.

Electronic cylinder

Replaces the cylinder with one opened by card, electronic key or phone.

• Pros: discreet, no wiring, good for existing doors.
• Cons: dimensions and lock type must be checked.

Complete lock with keypad, card or fingerprint

Replaces the escutcheon and sometimes the lock body, with the reader on the front.

• Pros: all-in-one, several opening methods.
• Cons: not all are compatible with multi-point security or armoured doors.

Motorised locks and electric strikes

Motorise the bolts of a security door, or operate gates and building entrances. Usually mains-powered and connected to an access control system or intercom.

Comparison

Type	Work involved	Physical security	Integration	Best for
Retrofit motor	None	That of the existing cylinder	Good (app, bridge)	Apartments, long-term lets
Electronic cylinder	Minimal	High with a good cylinder	Medium–high	Existing doors, offices
Keypad/fingerprint lock	Low–medium	Model-dependent	Medium–high	Homes, holiday lets
Motorised / electric strike	Medium	High	Very high	Villas, gates, building entrances

What to check before buying

1. Door type: security, armoured, timber, aluminium or a metal gate.
2. Emergency opening: mechanical key or external power if the batteries fail.
3. Battery life and low-battery warnings.
4. Access management: temporary codes, schedules, opening log.
5. Connectivity: Bluetooth, Wi-Fi via a bridge, Zigbee, Z-Wave or Matter depending on the model.
6. Cylinder security: anti-bumping and anti-snap protection, plus the manufacturer’s certifications.
7. Free egress: from inside, the door must always open without a code, for safety in an emergency.

Using them in holiday rentals

Electronic locks solve key handovers:

• A unique code per booking, valid from check-in to check-out time.
• Codes for cleaning and maintenance, limited to set hours.
• An opening log: you know when guests arrived and when the cleaners left.
• No copied keys in circulation.

We combine this with other measures in how to automate access and security in holiday rentals.

Worked example: a holiday apartment in a building

• Apartment door: a security-rated electronic cylinder with an outside keypad and app.
• Building entrance: guests receive a temporary intercom code or mobile credential, if the owners’ association has approved it.
• Each booking generates its own code automatically, expiring at check-out time.
• The cleaner has a personal code valid 11:00–15:00.
• If the batteries ever run flat, the owner keeps an emergency mechanical key.

Common mistakes

• Fitting a smart motor on a low-quality cylinder.
• Buying a lock that doesn’t fit a multi-point security door.
• No plan for emergency opening.
• Reusing the same code for every guest.
• Relying on an app that only works online, with no local fallback.

Conclusion

A well-chosen electronic lock brings convenience, control and traceability. Start with the door and cylinder, check emergency opening and code management, and plan integration with the intercom, alarm and automation. For holiday rentals, per-booking codes are the big win.

Domolife advises on locks and their integration with access control. Tell us about your case.