France separates two questions that buyers arrive treating as one. Running a house on panels and a battery is barely regulated. Putting a habitable dwelling on the cheap rural land that makes the idea affordable is governed by zoning written decades before rooftop solar existed — and the enforcement side of it changed twice in eight months.
Key number
€0
What a French self-consumption install now earns from the state. The arrêté of 1 June 2026 abolished the prime à l’autoconsommation for everything under 100kWc, and the surplus purchase rate fell to 1.1c€ per kWh for connection requests validated from 5 June 2026. An isolated system never qualified; from June 2026 a connected one collects almost nothing either.
The PLU decides before the panels do
Every commune sorts its land under a Plan Local d’Urbanisme into four letters: U for already urbanised, AU for land earmarked for development, A for agricultural, N for natural or protected.
Off-grid buyers gravitate to A and N because that is the cheapest and emptiest ground in the country, and it is exactly the zoning written to permit farm buildings and little else.
Under the Code de l’urbanisme a structure under 5m² needs no formality, 5–20m² needs a déclaration préalable, and anything over 20m² needs a full permis de construire — the same permit a grid-tied house needs, read against the same zoning.
Building anyway has a name in French law, cabanisation, and around 30,000 parcels in Hérault alone have been identified as illegally cabanised.
The Loi Huwart of 26 November 2025 created a prefectoral demolition procedure on the mayor’s referral and blocked power and water hookups to buildings whose land use does not conform.
A Senate bill adopted on 6 May 2026 would strip the ten-year prescription that let an unnoticed structure become unchallengeable; that was a first reading, and the bill still sits before the Assemblée nationale.
The routes that work are narrow: land already zoned U or AU with a normal permit, an existing legally permitted dwelling on A or N land that you renovate, or housing genuinely tied to farming.
Source: Grid CEO’s France and Germany guide, on the PLU letters, the permit thresholds and the 2025–26 cabanisation texts
Consuel signs off a connection, not an island
A Consuel attestation de conformité is the document that unlocks a grid connection: a new dwelling being connected, a full rewire, or generation feeding the public network. The generation attestations are colour-coded, bleue for production without storage and violette for production with storage, and since 2 September 2025 they cost €201.17 and €230.32 for a private customer, inspection visit included.
A genuinely autonomous installation has no connection to request and falls outside that visa. The standard does not fall away with it: NF C 15-100 and the UTE C15-712 photovoltaic guide are what a French installer builds to, and what an insurer asks about after a fire, whether or not a Consuel form was ever filed.
Source: French Consuel guidance on attestation types and 2025–26 pricing, read August 2026
The sun you actually get
Modelled at optimal tilt, Avignon runs 5.37 peak sun hours a day on annual average and still 3.35 in December, for 1,549kWh a year from every kWp installed. Limoges runs 4.19 and 2.19, for 1,218kWh. Rennes runs 3.95 and 1.89, for 1,156kWh.
For an off-grid design the winter ratio matters more than the annual average. Provence holds 62% of its annual daily average through December; Brittany holds 48%. That is the difference between a bank that recharges most days in January and one that waits on the weather.
Source: PVGIS 5.2 (European Commission JRC), SARAH2 satellite data 2005–2020, optimal tilt, 14% system loss; read August 2026
What a build costs installed
Turnkey French pricing in 2026 runs €6,000–12,000 for 3kWc, €12,000–20,000 for 6kWc and €16,000–22,000 for 9kWc — roughly €2,000–4,000 per kWc at the small end, before any storage. Those are grid-tied figures. An off-grid build adds the battery bank, a hybrid inverter sized for the whole house rather than for export, and mounting for a deliberately oversized array.
Nothing comes back off that now. The premium and the export tariff both went in June 2026, so the French comparison is the bare install price against the written Enedis connection quote for your parcel.
Source: EDF Solutions Solaires 2026 price guide, including the June 2026 abolition of the self-consumption premium; read August 2026
Water and sanitation
A well or borehole for household use has to be declared at the mairie, existing or planned, under article L2224-9 of the Code général des collectivités territoriales — an obligation running since 1 January 2009.
Domestic means 1,000 cubic metres a year or less, per article R214-5 of the Code de l’environnement. Since 1 February 2024 the declaration goes through the DUPLOS service, which generates the Cerfa 13837 form, and it is filed twice: before the work, then again once the borehole exists.
Sanitation off the public sewer runs through the SPANC, the commune’s non-collective sanitation service, which approves the design and inspects what gets built. Neither process changes because the electricity is yours.
Source: French state guidance on domestic boreholes (L2224-9 CGCT, R214-5 Code de l’environnement, DUPLOS) and Grid CEO’s France and Germany guide on SPANC; read August 2026
The catch
The Loi Huwart’s sharpest tool is the connection block: an unauthorised building on non-conforming land can be refused power and water. That lever cannot reach a house which never asks for either, which is why buyers conclude that going off-grid answers the land question.
It removes the utility’s file from the mairie’s desk and leaves the building as the only thing left to look at, at the moment demolition became procedurally faster.
Source: Grid CEO’s France and Germany guide on the 2025–26 enforcement texts
Common questions
Is it legal to live off-grid in France?
The electricity side is close to unregulated: an isolated solar-and-battery system with no connection needs no Consuel visa, though NF C 15-100 and the UTE C15-712 guide still govern how it is wired. Whether you can live there is a planning question.
Land classified U or AU can get a normal building permit; land classified A or N is refused by default, unless you are renovating an existing legal dwelling or building housing genuinely tied to farming.
Does an off-grid system get any French subsidy in 2026?
No. The self-consumption premium was abolished for installations under 100kWc by the order of 1 June 2026, and the surplus purchase rate dropped to 1.1 cents per kWh for connection requests validated from 5 June 2026. Both were keyed to a grid connection in any case, so a stand-alone system was never eligible.
Do I have to declare a borehole?
Yes. Any domestic well or borehole must be declared at the mairie under article L2224-9 of the Code general des collectivites territoriales, an obligation in force since 1 January 2009, with the declaration filed before the work and again after it. Domestic means abstraction of 1,000 cubic metres a year or less.
Where these figures come from
- Grid CEO — Off-Grid Solar in France & Germany (PLU zoning letters, permit thresholds, cabanisation, Loi Huwart and the 2026 Senate bill, SPANC) — read August 2026
- EDF Solutions Solaires — 2026 installed prices for 3, 6 and 9kWc, and the abolition of the self-consumption premium — read August 2026
- Consuel attestation guide — which colour applies to generation with and without storage, and 2025–26 pricing — read August 2026
- Préfecture du Gers — obligations for domestic boreholes under 1,000m³ (L2224-9 CGCT, R214-5, DUPLOS declaration) — read August 2026
- PVGIS 5.2 (European Commission JRC) — annual and December peak sun hours for Avignon, Limoges and Rennes — read August 2026
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