Security for a villa that stands empty nine months a year

Burglary is the risk owners ask about. Water is the risk that actually empties the bank account. A villa left alone through a Mallorcan winter is far more likely to be damaged by a failed pipe, a storm or a tripped breaker than by anyone climbing the wall — and all three are cheap to detect and expensive to discover late.

What actually happens to empty houses here

Water. A supply pipe, a boiler fitting or a washing machine hose lets go in November. Nobody is in the house. The manager visits fortnightly. By the time it is found, the ground floor is ruined, and in a stone building the moisture stays in the fabric for a year afterwards. This is the single most common serious claim on villas on this island.

Power. A breaker trips during a storm. The freezer defrosts, the pool pump stops, the filtration goes anaerobic and the pool turns green — which is a €600 problem and a fortnight of chemistry rather than a disaster, but an avoidable one.

Humidity. A closed villa with no ventilation and no dehumidification grows mould through a wet winter, particularly in north-facing rooms and anywhere with limestone. Owners arrive at Easter to a smell that takes months to remove.

Storms. An awning left extended in a Tramuntana gale destroys itself and often the wall it was fixed to. A wind sensor prevents this entirely and costs less than the excess on the claim.

And, yes, intrusion. Real, but less frequent than the above, and overwhelmingly opportunistic — an obviously empty house with shutters closed for months and post visible through the gate.

What to monitor, in order of what it saves

Sensor	Typical cost	What it prevents
Leak detectors at every wet point	€30 – €90 each	The claim that ruins a winter
Automatic water shut-off valve	€400 – €1,200	Everything downstream of the leak
Power and mains monitoring	€100 – €400	Freezer, pool, alarm going dark
Humidity sensors per zone	€25 – €70 each	Mould, and the furniture in it
Wind sensor	€400 – €1,200	Awnings, pergolas, the wall behind them
PoE cameras, per unit	€180 – €600	Intrusion, and knowing who came

A leak detector costs less than a restaurant dinner. An automatic shut-off valve that closes the mains when one of them gets wet is the most cost-effective thing you can fit to a house that stands empty, and it is routinely left out of specifications in favour of a fourth camera.

Making an empty house look occupied

Presence simulation has a poor reputation because most implementations are obvious — a lamp snapping on at exactly 19:00 every evening announces an empty house more clearly than darkness. Done properly it varies: different rooms on different evenings, timing tied to actual sunset rather than the clock, blinds that move during the day, and lighting that behaves the way a person behaves.

Combined with shading that opens and closes and a gate that occasionally operates for the gardener, that is a far more convincing signal than any alarm box on a wall.

Where the alarm fits

A monitored alarm has a role, especially for insurance, and existing panels can very often be brought into the same system rather than replaced — many speak a documented protocol and simply need bridging. What I would avoid is treating the alarm as the whole security story. It tells you somebody is inside. It does not tell you the boiler failed in January, which is the event far more likely to actually cost you money.

What a sensible package looks like

For a typical villa: leak detection at every wet point with an automatic shut-off, humidity sensors in the rooms that suffer, power monitoring, a wind sensor if there is anything to retract, four to six cameras recording locally, and shading and lighting doing the occupied-house impression. That lands around €4,000 to €9,000 installed, and the water half of it is the part that pays for itself.

Then somebody has to be responsible for the alerts, which is what managed support exists for. More on the camera layer in cameras without the cloud.