Leak sensors, cameras and check visits for a home you rarely visit

Key rules

• Sensors and visits: Sensors only warn you, so they never replace a person checking the home.
• Backup connection: Choose a 4G hub and battery backup so alerts still reach you if broadband or power fails.
• Camera footage: Keep footage for one month at most unless you need it as evidence.
• Insurance: An insurer may reject a claim on an empty home if you ignore its unoccupied-home conditions.

What to install

Sensors warn you, but only a person in the home can fix a problem. Use sensors and visits together.

• Water leak sensors: put them under sinks and near the water heater, washing machine and toilets.
• Humidity and temperature sensors: these show damp building up before you see it.
• Door, window and motion sensors: these cover intrusion.
• Monitored alarm: this is the most reliable option against break-ins. A Central Receptora de Alarmas receives the alert and calls for help. In Spain it must come from a security company authorised by the Ministry of the Interior to notify police.

Choose devices that keep working

Wi-Fi devices are easy to install, but they fail when the router or power goes down. Zigbee devices run on batteries and use little power, but they need a hub that is itself online. A 4G (SIM) alarm hub or router keeps working when broadband fails. Add a battery backup for power cuts.

Replace batteries every year and test the devices regularly. Dead batteries and false alarms are the most common failures.

What it costs

These are typical Spanish retail prices for 2025. They vary by brand and installer.

A shut-off valve is worth considering. It stops a leak even when nobody can reach the home.

Camera limits

A camera inside your own home, used only for personal purposes, is fine. The rules apply once it films anything beyond that.

• Do not film the public street. The only exception is a minimal strip you cannot avoid when protecting your entrance.
• Do not film neighbours' doors, windows or private spaces.
• Cameras on stairs, in garages or in gardens need a vote of the owners' meeting (junta). You also need a notice sign. Without approval, do not film communal areas.
• Keep footage for one month at most, unless you need it as evidence.

Fines for breaking these rules can be significant.

Check visits

Have someone check the home in person every 2–4 weeks, and weekly in storm season or high-risk areas. A neighbour, a friend or a paid key-holder can do it. Ask them to run taps, look for damp and test the sensors.

Insurance matters here. Many policies require a check once a home has been empty for a set period, commonly 30–60 days. Others limit cover for theft or water damage, or ask you to turn the water off while you are away. Read the unoccupied-home conditions in your policy. If you do not meet them, the insurer may reject a claim.

The warnings, timeline and FAQ below cover the rest.

Timeline and deadlines

• Have someone check the home in person: every 2–4 weeks

• Increase check visits to weekly in storm season or high-risk areas: during storm season

• Read your insurer's unoccupied-home conditions and arrange a check before the limit passes: before the home has been empty 30–60 days

• Delete camera footage you do not need as evidence: after one month

What to watch out for

• Insurer may reject a claim on an empty home: Many policies restrict cover for theft or water damage once a home has been empty for a set period, commonly 30–60 days, and some require the water to be turned off. If you do not meet these conditions, the insurer may reject your claim. Read the unoccupied-home conditions in your policy, ask your insurer what they require, and arrange a check visit before the limit passes.

• Sensors alone do not replace visits: Dead batteries and false alarms are the most common sensor failures, and a leak or break-in can go unnoticed if nobody ever looks. Replace batteries yearly, test sensors regularly, and keep to check visits every 2–4 weeks.

What if a leak or break-in happens while you are away?

Set up before you leave

Have a local contact with keys who can get in quickly. Give their phone number and email, and yours, to the community administrator (administrador de fincas). Tell a neighbour or the community president that you will be away. Keep your insurer's 24-hour assistance number somewhere you can find it from abroad.

If a leak is reported

Get the water stopped first, then deal with the paperwork. Do it in this order:

1. Call your local contact and ask them to close the main stopcock (llave de paso) of the flat or building. If they cannot go, ask the administrator or a neighbour.
2. Call your insurer's assistance line. It can send a plumber and open the claim. Tell your home insurer straight away, as many policies set a deadline, often within 7 days.
3. Call 112 if there is flooding you cannot control, or if water has reached sockets or the electrical panel. Nobody should touch wet electrics. The power should only be switched off at the board if the board is dry.
4. Tell the neighbours below and beside you and the administrator. Swap insurance details.
5. Photograph and film the damage and the source before anything is cleaned.
6. Keep every invoice. Once the source is fixed, fill in the amicable accident report (parte amistoso) with the affected neighbours.

For a gas leak, call the gas distributor's emergency line, printed on your bill.

If there is a break-in

1. Call 112, 091 (Policía Nacional) or 062 (Guardia Civil) if the break-in is found while it may still be happening. Ask your contact not to touch anything.
2. File a report (denuncia). This is done in person at any Policía Nacional or Guardia Civil station. If you are abroad, give a written or notarised authority to your local representative to file it for you. For theft with no violence and no known suspect, some forces take a first report online, but it must then be confirmed at a station.
3. Tell your insurer quickly. This usually means within a few days. They will normally ask for a copy of the denuncia.

Your representative will need ID or passport, proof of ownership or tenancy, a list of stolen or damaged items with values, and photos. A Spanish consulate can pass information on, but it is not the normal route for a criminal complaint.

Who pays

If a leak starts in your flat, you are generally responsible for damage to your neighbours, even if the flat is empty. An absent owner can be seen as negligent. In practice, the liability cover (responsabilidad civil) in your home insurance usually settles these claims, and insurers often sort it out between themselves.

The community may be responsible instead if the source is a shared element, such as a communal pipe or the roof. Proof of where the leak started matters, which is why the photos come first.

After a break-in, you bear your own losses unless your policy covers them.

Frequently asked questions

Will my leak sensors still work if the broadband goes down?

Only if they do not depend on your home broadband alone. Wi-Fi sensors stop reporting when the router or power fails, while a hub or alarm with a 4G SIM and a battery backup keeps working through both.

How much does a monitored alarm cost in Spain?

A monitored alarm kit costs about €200–500 up front, plus a monthly fee of about €30–60.

Can I put a camera on my flat's stairs or garage?

No, not on your own say-so: filming communal areas needs a vote of the owners' meeting (junta) and a notice sign.

What does a smart water shut-off valve cost?

The device costs about €100–300, and a plumber usually adds about €80–200 to install it. It is worth it if you want the water cut automatically when a sensor detects a leak.