Decentralised ventilation for Côte d'Azur properties, installed without major building work
Many Riviera apartments and older houses have no room for the ducts of a central VMC (mechanical ventilation). Decentralised units go in room by room, each through a single hole in an outside wall, with no ducts or false ceilings. We connect you with English-speaking specialists across the region.
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Get quotesOn this page6 sections
- How does decentralised ventilation work?
- Which decentralised ventilation unit is right for each room?
- Why is ventilation more important in sealed Côte d'Azur properties?
- What pushes up the cost of room-by-room ventilation units?
- French terms for a room ventilation quote
- Frequently asked questions about decentralised ventilation on the Côte d'Azur
How it works
How does decentralised ventilation work?
Each unit is a self-contained fan mounted through an outside wall. It brings fresh air into its own room and pushes stale air out, with no link to any other unit.
Most run in a push-pull cycle: out for a short spell, then in, through the same opening. A ceramic core inside holds heat from the outgoing air and hands it to the incoming air. A central VMC system works differently: one fan runs slowly all day, with ducts to every wet room.
Fitting a unit means one hole through the outside wall plus a power supply. There's no false ceiling and no structural work, and a skilled installer can fit one in a morning. In dense blocks in Nice, Cannes or Antibes, central ducts would have to cross shared walls and common areas. There, room units are often the only practical option.
Unit types
Which decentralised ventilation unit is right for each room?
Best all-round choice
Single-room heat recovery unit (VmR)
Supplies and extracts through the same unit, recovering heat on the way. It suits bedrooms, living rooms and home offices, and good models are quiet enough for a bedroom on low speed. Most have a humidity or CO2 sensor that speeds the fan up when the room needs it. Plan on one per habitable room.
Extract-only unit (bathroom/WC)
A simpler unit for bathrooms, WCs and utility rooms. It pulls damp air out when humidity rises, with no heat recovery and no fresh-air supply. Replacement air comes in from the other rooms under the doors. It's the cheapest option where the goal is getting steam and smells out.
Kitchen extract unit
Cooking puts out a lot of steam and smell. A kitchen unit handles the background ventilation and is separate from the cooker hood. In French apartments where a hood can't vent outside, the usual fix is a recirculating hood plus a wall extract unit.
Paired units (balanced ventilation)
Two units on opposite walls of a large room, one blowing in while the other extracts, then swapping. The airflow is steadier than a single unit's push-pull. It costs more and is worth it in rooms above 30-35 m2, where one unit may not cover the space.
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Why is ventilation more important in sealed Côte d'Azur properties?
Older Riviera houses were built to ventilate themselves, with high ceilings, shutters and thick walls. Add split air conditioning and the windows stay shut all summer. A sealed, cooled room builds up stale air, moisture and CO2 faster than an open one. It still feels comfortable, so nobody notices.
A closed bedroom gets stuffy overnight. Units with a CO2 sensor deal with that on their own, speeding up when the air goes stale and dropping back when the room is empty.
Second homes gain most. The units can run at very low speed all winter while the place is empty, which keeps humidity and mould down through the wet autumn and winter. That matters most in apartments near the sea in Nice, Antibes or Menton. For the rest of the shut-down routine, see preparing your Côte d'Azur second home for a long absence.
What drives the price
What pushes up the cost of room-by-room ventilation units?
Count the rooms first. A flat usually needs a heat recovery unit in each bedroom and living room, extract units in the bathroom, WC and kitchen, and a pair in any very large room.
The wall comes next. Coring through thick stone in an old Nice or Menton building is slower than drilling a modern block wall. Each unit also needs power. If the cable is chased into the wall, the room needs replastering and painting; surface trunking avoids that but stays visible.
Paperwork comes before drilling: usually a déclaration préalable (planning declaration) at the mairie (town hall) for each new opening and, in a copropriété (co-owned building), an owners' vote.
In a home over two years old, TVA (French VAT) is 5.5% if the unit counts as double flux or hygroréglable ventilation and 10% if not. Don't count on a grant: the CEE bonus (energy-supplier grant) for heat recovery is written for a central unit with ducts, so room units rarely qualify. MaPrimeRénov' (the state renovation grant) stopped funding double flux ventilation as a single measure on 1 September 2026.
Get at least two written quotes. Ask each installer to name the model, list the units room by room and say how the cables will run.
French terms
French terms for a room ventilation quote
Key French terms for this service
Questions
Frequently asked questions about decentralised ventilation on the Côte d'Azur
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Often the best fit. There are no ducts to run through shared walls, so the work stays inside your flat. In older Nice, Cannes or Antibes buildings with solid masonry and no ceiling void, room units are often the only option short of a full renovation. The outside wall is usually a common part, though, so you'll need the building's approval.
Usually, yes. A new opening changes the façade, which normally needs a déclaration préalable at the mairie. Near a listed building, the Architecte des Bâtiments de France also has a say. In a copropriété the outside wall is usually a common part, so you need a general assembly vote before anyone drills.
Yes. Each unit works on its own, so you can start with the room that has the worst damp and add others as budget allows. In a copropriété, put the whole plan to one general assembly vote, so you aren't asking again for every new hole in the wall.
Yes, if you choose a heat recovery unit. Its core keeps most of the heat in the outgoing air. Riviera winters are mild, so the saving is smaller than in northern France, but it still trims heating bills from November to February.
Yes. Set them to their lowest speed before you leave and they keep air moving through the rooms while nobody's there. That holds humidity down through the wet autumn and winter, when mould takes hold in closed apartments near the sea.
Sources
Official sources for room ventilation tax, grant and permission rules
- BOFiP: BOI-TVA-LIQ-30-20-95, reduced TVA on energy renovation work Double flux and hygroréglable ventilation are on the 5.5% list, with no RGE condition.
- Ministère de la Transition écologique: CEE sheet BAR-TH-125 (double flux ventilation) The CEE bonus for heat recovery ventilation is written for a central unit with ducts and needs an RGE installer.
- Légifrance: décret n° 2026-822 of 25 August 2026 Ends MaPrimeRénov' for double flux ventilation as a single measure from 1 September 2026.
- Service-Public.fr: déclaration préalable de travaux (F17578) A new opening that changes a building's outside appearance needs a déclaration préalable.
- Service-Public.fr: works in a copropriété apartment (F31513) Work that affects common parts or the outside of the building needs a general assembly vote before it starts.
Rules checked against these sources in September 2026.