Prolonged drought and heat waves are causing clayey soils in France to shrink and swell, resulting in structural cracks in thousands of homes [5].
This phenomenon creates a significant financial risk for homeowners and the insurance industry as climate change intensifies soil instability across the country. The instability threatens the safety of residential buildings and the solvency of insurance models designed for more stable weather patterns.
In regions such as Haute-Garonne and Languedoc-Roussillon, homeowners report that the movement of the earth is destabilizing their foundations [1, 3]. In the commune of Villeneuve-lès-Bouloc, the damage has left residents in fear for their safety. One homeowner said, "Le mur peut tomber à tout moment" — the wall could fall at any moment [1].
Approximately 50% of French territory is now exposed to the shrink-swell effects of clay soils [4]. This geological vulnerability means that when extreme heat dries out the ground, the soil contracts, leaving foundations unsupported. When rain returns, the soil swells, pushing against the structure, and creating deep fissures in walls and floors [2, 3].
For many residents, the crisis is as much financial as it is structural. Some homeowners have been forced to pay up to 120,000 euros for repairs [1]. However, securing insurance payouts has proven difficult. A reporter for MidiLibre said that many insurance claims are being closed without any action taken [3].
Analysts said the situation is "une catastrophe sociale et économique" — a social and economic catastrophe [2]. The scale of the damage is expected to grow. While the cost to France was estimated to exceed 5.6 billion euros based on 2022 data [6], projections suggest that insurance payouts could reach several tens of billions of euros by 2050 [7].
“"Le mur peut tomber à tout moment"”
The crisis highlights a growing gap between historical insurance risk models and the reality of climate-driven geological shifts. As clayey soils react to extreme temperature swings, the resulting structural failures transform a meteorological event into a permanent real estate devaluation. This shift suggests that traditional home insurance may become unaffordable or unavailable in high-risk zones of France, potentially requiring state intervention to prevent widespread housing instability.
