Caisse des Dépôts, partner of the Toits Temporaires Urbains project

On 6 April, Caisse des Dépôts signed the memorandum of understanding for the Toits Temporaires Urbains (TTU- Urban Temporary Roofs) project in partnership with the Regional and Interdepartmental Housing and Accommodation Department, SNCF Immobilier, the City of Montreuil, Aurore and Plateau Urbain.

Property & housing

Le site Les Grands Voisins géré à Paris par l’association Aurore
Toits Temporaires Urbains (TTU) is developing a turn-key offer for local authorities for the temporary occupation of unused or partially occupied urban wasteland.


This project is sponsored by the Ile-de-France regional management of Caisse des Dépôts and was selected as the winner of the 7th season of the call for projects launched by the Caisse des Dépôts Innovation scheme, Lab CDC.


TTU will allow for the installation of structures that can be disassembled and reused with a high quality of usage and comfort on vacant land, for a time period of 18 to 36 months. The land identified will be, in part, occupied by high-social-value infrastructure open to the city (open air child care centres, work spaces, shared gardens) but also for temporary occupation for accommodation or social housing offers.  After the planned occupation, the land will be freed up and the structures disassembled to be reused on other sites.


The aim is to be able to deploy, across the Parisian region and eventually nationally, temporary and secure property occupations for owners and for the authority, by responding to public interest needs, including housing.


All of the partners – land owners, local authorities, the State, financial backers, managers and assistance to contracting authorities – have joined forces with Caisse des Dépôts to reach a shared definition of an approach to follow, aiming to generalise and speed up the use of vacant land for housing and social utility purposes.

The completion of this project encompasses a public interest need, an innovative research process and a partnership between committed stakeholders.

Marianne Louradour, Caisse des Dépôts Regional Director


Caisse des Dépôts, in accordance with its traditional mandate, is supporting public policies undertaken by the State and local authorities here. The first trials are planned for winter 2018.


E Pliez, JM Delorme, M Louradour, G le Chequer, B Quignon et P Citron


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