France possesses one of the largest social housing systems in Europe, with over 5.2 million units registered as of the end of 2024. However, the system is struggling with significant delays in assigning housing to those in need. By the end of 2024, nearly 2.8 million housing applications had been received—more than 1 million more than in 2014. On average, it takes 19 months nationwide to allocate social housing, but in the Île-de-France region, which includes Paris, the average wait time stretches to nearly 39.5 months. In Paris, only 23.2 percent of housing allocations are completed within a year, compared to 55.1 percent across the country. In Île-de-France, almost 29.3 percent of applicants wait more than four years for housing, a rate more than double that seen elsewhere in France. The main challenge is not the number of available housing units or the level of rent, but the slow pace of residential mobility—meaning people are not moving out of their homes quickly enough to free up space. Many applicants have an average monthly income of 1,782 euros, indicating financial instability, but this does not fully explain the system's congestion. In fact, around 72 percent of the French population is eligible for social housing based on current income criteria, which puts enormous pressure on a system that lacks the turnover needed to keep up with demand. New construction of social housing has remained below 90,000 units per year, a rate that is not enough to replace the existing stock or meet growing demand. The French government has set a goal of building 125,000 social housing units by 2026 as part of a broader plan to construct 400,000 new homes annually, including both social and private housing. However, simply building more will not resolve the issue unless the system’s allocation and mobility problems are addressed. Measures such as helping households move out of social housing when their financial situation improves, encouraging internal relocations, or adapting housing to changing family needs are often discussed but rarely implemented effectively. Since 2018, over 804,000 homeless individuals have found stable housing, with nearly 219,800 of those allocations going directly to people who previously lived in emergency shelters or on the streets, as of March 2026. These figures show that, despite its inefficiencies, the system can still respond to urgent needs when there is political will and sufficient resources. The French social housing crisis is not simply about the quantity of housing or the level of rent. It reflects a system that is stuck due to a lack of movement—each housing unit that remains occupied prolongs the waiting time for others. While building more housing is essential, without a serious effort to improve the fluidity of residential mobility, the waiting lists will continue to grow.