The estimated need of housing units to adress future demand for main houses is 1,5 million units by 2030, an average 70.000 units per year, which result from:

• 38.000 units per year to adress the needs resulting from demographic growth, taking into acount a growth at the same speed as the overall french population taking into acount ageing population, residential behaviour and migrations.
• 12.000 units per year to avoid a deeper deficit than today. This would allow a reduction in the household size as in the rest of the country, making easier for people to change their homes according to their needs.
• 17.000 units per year to compensate demolition and other lost units in the old buildings
• 3.000 units to maintain a vacancy rate similar to the present one, alredy the lowest in 40 years.

Overall, this building effort will compensate a regular decline in the housing production since the begining of the 1990s. It should allow to develop the offer of housing for students, old people, handicapped people, young workers, people in social risk, and nomads. Social housing would be developped to adress the current deficit.

Most of this process will correspond to private developers, depending so on the social and economic situation, and especially the acces to credit by both developer and citizens, the real purchasing power of households and the evolution of real estate prices.