Nantes

French housing cooperatives mostly build homes for their members to buy, not to rent. The oldest form is the coopérative HLM (a cooperative company inside France's regulated social-housing system), which sells new homes to modest-income households. It often uses the PSLA (prêt social location-accession, a lease that converts into purchase after a trial period). The newest form separates land from building. An organisme de foncier solidaire, or OFS (a non-profit land trust), keeps the land for good. Buyers acquire only the building rights under a bail réel solidaire, or BRS (a long, renewable lease with resale prices capped). It is France's version of the community land trust model now spreading across European cities. A third, smaller strand is habitat participatif (participatory housing), in which future residents design a building together.

The Nantes tradition began with a cooperative and a famous architect. In 1949 the Maison familiale, a low-cost housing cooperative created in 1911, commissioned Le Corbusier to build in Rezé, just across the Loire. The Maison Radieuse opened in 1955 with 294 flats. Its residents were meant to acquire their homes over time under cooperative ownership, with a loan the city guaranteed. At the same moment the Castors (the "beavers", a post-war self-build movement) were raising their own houses. With help from the council, about a hundred of their homes were finished in 1954, built by their future owners in their spare time.

Today the sector falls into three groups, each facing a different constraint. The cooperative HLM builders are the oldest. MFLA (Maison Familiale de Loire-Atlantique) and its partner Demeures et Tradition have delivered nearly 5,000 homes for ownership since their origin. CIF Coopérative, a cooperative HLM company, was approved as a land trust in its own right in 2025 so it can sell under the BRS. Their output depends on buyers who can still borrow. The second group is the land trust itself. Atlantique Accession Solidaire was set up in 2019 by the département, Nantes Métropole, the Saint-Nazaire agglomeration and 14 social landlords, as a Scic (a multi-stakeholder cooperative company). Its founding plan priced BRS homes at around €2,300 per m², a little over half the open-market price the plan quoted. Its constraint is volume. The third group is the participatory builders, led locally by ICEO, a Nantes developer from the social and solidarity economy. The metropolis counts fifteen completed participatory projects and nine more under construction or in design since its first call in 2016. Their constraint is time. The Les Ruches group that co-designed Zellige formed in 2011 and moved in nine years later. Across Europe, research on collaborative housing shows the same pattern: projects take years to assemble and depend on patient public partners.

From our library

Organisme de foncier solidaire en Loire-Atlantique — dossier de presse (juin 2019)

How the Loire-Atlantique land trust was set up.

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Organisation in focus

ICEO

The Nantes developer behind most of the metropolis's participatory housing.

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Public policy treats all three as affordable ownership. Launched as an experiment in 2019, the BRS has been open in all 24 communes of the metropolis since 2022. In 2025 the metropolis stretched it to middle incomes under the name BRS+. 920 BRS homes have been approved. The trial caps prices at €3,000 to €3,600 per m², about 25% below the market. The cooperative form is becoming the metropolis's main tool for keeping ownership within reach, and politics will decide how far it can grow.

On 22 March 2026 Nantes kept its course. Johanna Rolland, the Socialist mayor since 2014, won the run-off with 52.18% against the centre-right Foulques Chombart de Lauwe. On 3 April she was re-elected president of the metropolis, with Agnès Bourgeais, mayor of Rezé, as vice-president for housing. The two camps offered opposite answers on housing. Rolland's programme promised that 40% of new homes would be social and a further fifth affordable, plus rent control and tighter rules on tourist lets. Chombart de Lauwe answered with home ownership. He promised to help residents become owners and to sell social homes to tenants who want to buy them.

The levers are split between three tiers. The national government sets the money and the tenancy law. On 23 January 2026 Prime Minister Sébastien Lecornu and housing minister Vincent Jeanbrun launched the Relance logement (housing recovery) plan, which aims for 2 million homes by 2030. The metropolis holds the local housing programme, the land and the rules on change of use. Its anti-crisis plan, launched in 2023 with €50 million, unlocked 7,400 stalled homes in three years. Its next programme, for 2028–2033, is due for adoption in December 2027. The city itself grants permits and asked in 2025 for rent control.

Rent control is the sharpest test. After the move to zone A, the city applied to join the national rent-control experiment, which lets a city set a reference rent and a ceiling above it. The council voted the bid on 28 March 2025. It estimated that more than 8,000 private homes were above the proposed ceilings. Local press has questioned whether the bid came too late under the experiment's rules, and it depends on the State's approval. Bordeaux, which has capped new leases since 2022, is now weighing whether to extend its own trial.

On empty space, Nantes has acted early. Since 1 January 2019, a main home may be let to tourists for at most 120 days a year, and companies that turn a home into a tourist let must create an equivalent home elsewhere. Offices are the next frontier. The Tour Bretagne, the 1970s office tower that dominates the centre, is being turned into about 200 homes and a hotel, with completion expected in 2029. Nantes Métropole Habitat is converting the former Crédit municipal, an office building of 1894 that stood empty from 2016, into 32 social homes. When the university hospital leaves the Hôtel-Dieu site for the Île de Nantes in 2027, the city intends to reuse its buildings rather than demolish them.

Climate targets push the same way. The metropolis's climate plan for 2024–2030 aims to cut greenhouse-gas emissions by almost half by 2030 and reach carbon neutrality by 2050. The 2021 Climate and Resilience Act adds zero net land take by 2050, halving the consumption of natural land over 2021–2031. Since 2022 the RE2020 standard has counted the carbon in new homes over their whole life. The Mon Projet Rénov service funds energy retrofits for low-income owners and co-owned blocks. Cooperative and social builders are the obvious vehicle. Elsewhere, cities such as Vienna, Brussels and The Hague have scaled collaborative housing with ground leases, concept tenders and loan guarantees. Nantes has so far relied on calls for projects and its land trust.

Caserne Mellinet shows what a whole district of affordable homes looks like. The former army barracks east of the centre covers 13.5 hectares and will hold 1,700 homes. The plan reserves 35% for social rent, a further third for affordable ownership and the rest for the open market. The builders include the cooperative CIF, the social landlords Harmonie Habitat and Habitat 44 and the developer Quartus. Several military buildings were kept, and one of 1910 will become a cultural venue. Inside the site, the Hameau des Paladines holds 59 homes designed with their residents, 14 of them sold under the BRS.

Lighthouse project

Reconversion Caserne Mellinet

The barracks turned into a 1,700-home district, 70% of it social or affordable.

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Zellige on the Île de Nantes put the participatory idea inside a large block. Tectône and Tact Architectes designed its 100 homes for CDC Habitat and the cooperative MFLA, finished in 2020. Sixty were sold as affordable ownership and forty let as social homes. Fifteen of the owners, the Les Ruches group, planned their flats together, and all residents share a large roof terrace. The island around it is still changing. Its south-west sector is planned with 33% social homes and a further fifth affordable, beside the new university hospital.

Hameau Marvingt is ICEO's answer to how participatory housing can serve every income. Its 33 homes, delivered in 2024 with Nantes Métropole Habitat and designed by Claas Architectes, mix eleven open-market homes, thirteen affordable-ownership homes and nine social rentals. It stands in the Bottière-Chénaie eco-district, built on former market gardens with the same 35/35/30 split as Mellinet. ICEO is repeating the formula in Nantes Nord. Fratera will bring 40 homes to a working-class district, up to twenty of them co-designed, with BRS homes at €2,480 per m², well below the open-market price.

Pirmil-Les Isles tests how the next district can be built. The development zone on the south bank plans 3,300 homes in timber, hemp, straw and earth, with plaster applied straight onto straw bales. Its first homes at Basse-Île started at the end of 2025. It carries the climate plan into construction itself.

Grand Bellevue makes the case for renovating rather than rebuilding. The post-war estate on the border with Saint-Herblain houses about 17,000 people. A €350 million programme, running to 2032, is renovating 1,300 social homes by 2028, and most are already done.

Across the river stands the building where the story began. The Maison Radieuse turned 70 in 2025 and still houses about 700 people. A cooperative commissioned it to let families own their homes without speculation. The barracks, the straw walls and the co-designed blocks show that the city of Jules Verne still wants the same thing. The open question is whether that ambition can grow beyond a few hundred homes a year.