Preparing your Côte d'Azur second home for a long absence

Closing up a house in the south of France for three to six months catches out owners used to northern Europe. The winters feel mild, so people switch everything off and leave. Then they come back in spring to mould. Burst pipes are rarer but cost more.

Why does an unoccupied Côte d'Azur property risk mold damage?

The coast is humid from November to February, especially within a few hundred metres of the sea. Shut a house up with no air moving and the moisture builds. Within two to three months mold shows up, usually on north-facing walls, inside wardrobes and in bathrooms.

So don't seal the house completely. If you have a VMC (mechanical ventilation), leave it running. It uses little electricity, and cleaning up mold in a badly affected house is major work. With no VMC, leave the window trickle vents open in at least two rooms on opposite sides of the house. Whoever checks the house can also air each room on their visits.

If mold keeps coming back despite this, the VMC is probably too small, blocked or failing. Have it serviced before you leave; our ventilation service page explains what that involves.

What temperature settings prevent frost damage in an empty Côte d'Azur property?

Hard frost is rare at sea level in Nice, Cannes or Antibes. Inland is different. Grasse, Vence, Valbonne and the Var countryside get frosts most winters, and houses set back in the hills can freeze exposed pipes.

As a rule, keep coastal houses at a minimum of 7°C inside and inland houses at 10°C. Heat pumps, gas boilers and most electric heating have a frost-protection mode that holds a set minimum. Turn it on before you leave, and don't switch the heating off completely.

Electric radiators without frost protection can run from plug-in thermostatic switches (sold at any French hardware store) set to 7°C. Pipes in a cellar, garage or other unheated space are the most exposed. Pipe lagging (isolation de tuyaux) is cheap and cuts the risk a lot. A pool heating circuit needs separate attention.

Should you isolate the water supply when leaving a Côte d'Azur property empty?

For absences up to about three months, turn off the main stopcock (vanne d'arrêt principale) inside the house. Then open a tap briefly to release the pressure and close it again. A faulty joint then can't leak mains water while you're away.

For longer absences, or inland where frost is a real risk, have a plumber drain the water pipes, especially any that run through unheated spaces. If the heating stays on frost protection, its own circuit stays full: ask the plumber to drain only the water supply.

Three things owners often forget:

• Washing machines and dishwashers hold water in their seals and pumps. Run a short empty cycle just before you leave.
• A water softener (adoucisseur d'eau) that runs out of salt stops working, and scale builds up in the hot water circuit. Top it up before you go.
• Leave pool winterising to a pool professional. Draining a pool system without experience often damages the lining or equipment.

What remote monitoring is worth adding to a Côte d'Azur second home?

A connected thermostat is the most useful single addition. It (or the heat pump maker's own app) shows the indoor temperature on your phone and alerts you if it drops below a set point. If the heating fails at Christmas, you know within hours instead of finding a burst pipe in April.

Beyond the thermostat:

• Water leak detectors: small sensors on the floor under the boiler, washing machine and dishwasher. They sound an alarm, and connected models send a phone alert. A boiler connection leaking for two months into a closed house is an expensive repair.
• Tripped-circuit alert: some smart fuse boards and home monitors tell you when a circuit trips. That matters if the pool pump, water heater or heating loses power while you're away.
• Indoor camera: one in the main living area lets you spot water on the floor or a heating fault. If you let the house, the CNIL says a camera inside a rented home breaches the tenants' privacy, so disconnect or remove it before guests arrive.
• Smart plugs with energy monitoring: they show whether appliances draw power normally, and odd readings can flag a fault early.

All of this needs an internet connection that stays live while you're away. Check that your broadband contract keeps running and that the router reconnects by itself after a cut. Where the phone line is unreliable, a router with a 4G backup SIM is a sensible precaution.

Which electricity and gas circuits should you leave on in an empty property?

Keep the heating on frost protection and the VMC running. Switch off at the socket anything on standby for no reason. That means the TV and audio, coffee machine and kettle, computers, washing machine and dishwasher, and decorative lights on timers (unless they're part of your security).

Leave on the router and monitoring equipment, the alarm and security lighting, and the fridge unless you empty and defrost it.

If you use gas only for cooking, closing the gas valve at the meter is a sensible precaution. If a gas boiler provides your frost protection, leave the gas on.

Second-home insurance: read the policy before you leave

Keep your assurance habitation running all year: the cover doesn't pause while you're away. French law doesn't oblige you to insure a house you own outright, but in a copropriété every owner must hold liability cover. Many policies also carry clauses about empty homes. Look for these:

• Some policies require you to tell the insurer if the house will be empty for more than 30 or 60 days in a row. If you don't, a claim for damage in that period can be affected.
• Water damage (dégât des eaux) from a slow, unnoticed leak may be capped or conditional during a long absence. Check whether the policy requires the water to be turned off.
• Some policies exclude frost damage to pipes if the heating was off. Keep proof that frost protection was on.
• The yearly boiler service is compulsory, and an insurer can refuse to pay after an accident with a poorly serviced boiler. Keep the certificate.

Someone checking the house every two to three weeks satisfies most "regularly visited" clauses.

Is a Riviera property manager worth paying while the house stands empty?

A local property manager charges a monthly fee for a weekly or fortnightly visit, a check and a short report. The fee depends on how often they come and what they do, so ask two or three for a written price. They'll spot a failed heating system, a leak or a stopped VMC. They can also take deliveries, let tradespeople in, handle emergencies, and attend copropriété meetings for you. If you live more than a few hours' drive away, a year of visits often costs less than one emergency trip to deal with a problem nobody caught.

Checklist for closing up a Riviera second home

• Heating on frost protection: 7°C on the coast, 10°C inland
• VMC running, grilles and filters clear
• Water off at the main stopcock, pressure released at a tap
• Water pipes drained if frost is a real risk or you're away more than three months
• Washing machine and dishwasher run empty
• Water softener topped up with salt
• Non-essential appliances off at the socket
• Gas valve closed if gas doesn't provide frost protection
• Thermostat online, showing the right temperature, alerts on
• Leak detectors under the boiler, washing machine and dishwasher
• Insurer told, if the policy requires it
• Property manager or neighbour briefed, emergency numbers left
• Broadband contract still active

More on ventilation, heating and remote monitoring

• Ventilation systems on the Côte d'Azur
• Smart home and remote monitoring
• Heat pumps: heating and cooling in one system
• Energy guide for second homes on the Côte d'Azur