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Firefighters struggling with forest fire
Europe spent much of this summer watching the risk quantified in a new German property study play out in real time. Wildfires around Bordeaux prompted France's largest-ever peacetime evacuation, while Spain battled the largest fire in its recorded history west of Madrid. More than 300,000 people were evacuated across the two countries. Germany escaped fires on anything approaching that scale, but not the underlying pattern of extreme heat and drought. A new study now puts numbers on what a changing climate could mean for German property, and its headline finding is stark: high heat stress could affect more than two-thirds of the country's building stock within 25 years.
The analysis, from consultancy Wüest Partner and climate-risk modeller Climada Technologies, examined roughly 23 million existing German buildings against three IPCC emissions scenarios, comparing projected exposure to 2050 with a historical reference period centred on 2000. "Climate risks are becoming a key factor in location and property value," says Michael Heigl, sustainability expert at Wüest Partner. The significance for investors lies not simply in whether Germany gets hotter, but in how differently individual locations and buildings respond.
Heat produces the biggest change. Virtually no buildings faced high or very high heat stress during the reference period; by 2050, that proportion rises to between 28% and 68%, depending on the emissions path. Southern and central Germany and densely built urban areas are most exposed, although the risk spreads northwards as emissions rise. Prolonged heat accelerates wear on roofs, façades and seals, increases cooling requirements and can push indoor temperatures in buildings without air conditioning to levels the authors describe as critical to health. Older, poorly insulated stock, top-floor apartments and heavily glazed buildings are particularly vulnerable. Buildings prone to overheating, the study warns, could ultimately lose market value.
Heavy rainfall shows another marked increase, albeit from a much lower base. The proportion of buildings classified as exposed rises from 0.4% today to between 5% and 11% by 2050. Southern Germany and the low mountain ranges carry the greatest risk, but the authors caution against treating heavy rain as a regional phenomenon: it can occur anywhere, as the 2021 Ahr Valley disaster demonstrated. River flooding, interestingly, moves in the opposite direction, with exposure projected to decline slightly from just under 6% to around 5.5–5.7% as prolonged rainfall and snowmelt decrease. The distinction matters: less conventional river flooding does not mean less water risk if flash floods and surface runoff are simultaneously becoming more frequent.
Coastal flooding remains a much more geographically concentrated risk, but potentially severe at individual locations. The study identifies particularly high future exposure along parts of the North Sea coast, including Wilhelmshaven, Wesermarsch and Bremerhaven. Storm risk is already far more widespread across Germany, particularly in western and northern regions, although its projected development varies substantially between the three climate scenarios.
What this means for owners and lenders
The study's recommendations are practical rather than alarmist: better insulation and shading against heat, flood-resistant basements and pipework, more resilient roofs and reducing sealed outdoor surfaces to improve drainage. What looks initially like climate modelling therefore becomes a capex question at individual building level — and potentially an insurance, financing and valuation question after that.
Insurance is already providing one indication of how physical risk acquires a price. Earlier research from JLL and Munich Re found commercial-property insurance premiums rising by an average 8–12% annually since 2018, with considerably steeper increases for some offices. The wider protection gap for losses caused by extreme weather also remains substantial. Wüest Partner and Climada warn that premiums could rise further in exposed areas and, more seriously for asset owners, insurance could become harder to obtain.
REFIRE: Lenders are beginning to confront the same problem. BaFin has warned that German banks have concentrated much more heavily on transition risks such as energy efficiency and carbon pathways than on physical hazards. That is changing. BayernLB is using address-specific Munich Re data across its existing property loan book and new business, while Helaba and HCOB are also moving towards more granular physical-risk information. The response is not necessarily a simple interest-rate premium: lenders can also adjust LTVs, require additional equity, alter repayment structures or demand more capex.
That creates a potentially important sequence for investors. Physical risk changes the cost of owning and protecting a building; insurance markets begin to reflect it; lenders incorporate it into underwriting; and eventually buyers have to decide what that means for price. None of this proves that climate risk is already being systematically discounted in German property values. The more uncomfortable possibility is that in many cases it isn't yet.
For investors, waiting until climate risk appears explicitly in financing terms may therefore mean waiting until somebody else has already put a price on it. The building may not have changed, but if its insurer, lender and next buyer have changed the way they assess its location, it is no longer quite the same investment.