Wall moisture in basement apartments of old buildings – Defects in light of current BGH rulings
On December 9, 2024, the Federal Court of Justice (Ref. V ZR 79/23) once again decided on the legal assessment of wall moisture in a basement apartment of an old building. The decision clarifies under what conditions moisture is to be qualified as a defect in a property purchase, providing valuable guidance for sellers, buyers, and investors in existing properties.
Facts and course of the process
The focus of the proceedings was the purchase of an apartment located in the basement of a building constructed around 1900, through a notarized purchase contract. After handover, the buyers noticed significant wall moisture in the basement. Due to the dampness, visible damage to the masonry and impairments to living comfort occurred. The buyer sought to rescind the purchase contract or claim damages, assuming there was a significant defect. There were no explicit agreements in the purchase contract regarding the condition or specific moisture issues.
The legal classification of moisture as a defect
The central issue was assessing whether the detected wall moisture constitutes a defect in terms of § 434 BGB. According to the current legal situation, the seller is obligated to provide a defect-free property unless an alternative condition is expressly agreed upon or obvious age-related characteristics are to be expected.
Standards according to current law
In older buildings, the assessment of defects also depends on what state of construction the buyer was entitled to expect based on the type and age of the house and the contractual context. A building must generally be adequately protected against penetrating moisture, even if modern sealing systems were not customary at the time of construction. Mere age conformity does not exclude a defect.
Significance of condition agreements
It is crucial whether the purchase contract specified a particular condition (e.g., “dry” or “suitable for residential purposes”). In the absence of such a provision, the objective standard is the usual condition of comparable properties at the time of contract conclusion.
Key points of the current BGH decision
The BGH confirmed that moisture damage in a basement apartment of an old building is considered a defect, even in older houses, if it exceeds what is expected in comparable properties. The decisive factor is the suitability of the premises for permanent residential use without unreasonable impairments.
The Senate differentiated according to the scope and intensity of the moisture manifestations. If the moisture damage is considered significant and substantially affects the usability or value of the property, it usually constitutes a defect. Such a condition can only be considered agreed upon if it is expressly regulated between the parties or necessarily arises from the circumstances of the individual case.
Legal consequences for sellers and buyers of old apartments
The decision entails a complex duty program for the contracting parties. Buyers are obliged to carefully inspect the condition—especially in basement apartments or older buildings—and pay attention to any deviations from the usual condition of comparable properties. Sellers bear the risk for non-obvious defects that impair the utility value unless an explicit exemption from liability has been effectively agreed or the defect was expressly excluded as a guaranteed characteristic.
The mere note that the basement is typically damper than other floors is not sufficient per se to discharge the seller. Rather, a sufficiently concrete agreement must be made to shift the standard of liability.
Implications for contract design and practice
The Federal Court of Justice’s ruling emphasizes the necessity of a clear contractual regulation of the condition of old buildings, particularly in the sensitive area of basements and basement apartments. Including clear information about the structural condition, especially concerning existing or potential moisture issues, is of significant importance—whether in the purchase contract itself or in the attached documents and protocols of any inspections.
At the same time, the decision raises significant questions regarding the scope of liability exclusions, the seller’s disclosure obligations, and the distinction between ordinary wear and tear and defect-causing conditions.
Conclusion and outlook
The latest BGH case law highlights the importance of careful examination and documentation of moisture issues in old building properties. Particularly in the basement area, the contracting parties have special duties of care. Legally secure contract drafting becomes increasingly important against this background to avoid later disputes about potential defects and their liability consequences.
For companies, investors, and private real estate buyers, this creates the necessity to anticipate all relevant circumstances when acquiring and selling existing properties and to secure them legally if necessary.
For further legal questions related to defects in old buildings, liability modalities in property acquisition, or the design of effective purchase agreements, the attorneys at MTR Legal are happy to help.
