Basel IV: The Costly Deception - Why We've Lost Our Sense of Reason When It Comes to Building Homes

A commentary by Harald Blumenauer, real estate expert

Basel IV is being sold as a modern bank bailout. But for real estate and financial brokers, it is merely an expensive return to rules from the imperial era--packaged as a bureaucratic monster that dictates interest rates to homebuilders.

Anyone looking to finance a home in Germany today encounters an acronym that hangs like a threat over bank lobbies: Basel IV. The new capital adequacy rules for banks, which have been phased in since 2025, are intended to make the financial system "safer." But anyone who has been in the real estate business for decades can only laugh bitterly at the regulators' supposed innovations. Because what is being sold to us today as highly complex risk management is, at its core, nothing more than a return to rules from the imperial era--only significantly more expensive and garnished with an overdose of bureaucracy.

The wheel has been reinvented--and is now square

Back in the "good old days" before the major Basel Accords, the world of construction financing was still transparent for customers and brokers. A clear distinction was made between the first mortgage up to 60 percent of the value--the so-called "secured portion"--and the second mortgage for the remainder. The first was affordable because it was secure; the second was more expensive because it was riskier. A simple, fair system.

Basel IV is now returning to precisely this principle with the so-called "loan-splitting approach." Banking regulators have suddenly rediscovered that a loan up to 55 or 60 percent of the property value carries virtually no default risk. But instead of using this insight to ease the burden on homebuilders, we are seeing the opposite: complexity is being exploited to maximize profits.

The trap of the blended interest rate

The key difference from the past is the lack of transparency. Whereas there used to be two separate components with clearly identifiable interest rates, customers are now usually presented with a "blended interest rate." The problem with this is that as soon as financing exceeds the 60 percent mark--even slightly--many institutions raise the interest rate for the entire loan.

So the bank charges for the risk on the entire amount, even though the majority of the loan is absolutely crisis-proof thanks to the land value and the building's structure. What used to be a transparent risk classification is now a "black box" from which a higher interest rate for the consumer almost always emerges in the end. They're selling us old wine in new, extremely expensive bottles.

The computer says "No"

What, however, causes the most despair among real estate agents and financing experts in 2026 is the creeping death of common sense. In the past, an experienced bank advisor could assess the value of a property and the reliability of a client. Today, these professionals have been reduced to mere data-entry assistants.

The algorithms behind Basel IV know nothing of local market knowledge or trust. They know only spreadsheets and "output floors." If the software values a property at 5,000 euros below the purchase price based on rigid statistical models, the house of cards collapses. The result is resignation and incomprehension on all sides. We have created a system so preoccupied with eliminating theoretical risks that it has completely lost sight of the practical realities of housing construction.

Conclusion: Regulation Without a Sense of Proportion

Regulators claim that Basel IV protects us from a new financial crisis. In practice, it primarily prevents young families from owning a home. While politicians loudly demand more affordable housing, a regulatory monster is being fed in the background, artificially inflating financing costs.

It is time to end the charade. We don't need another thousand pages of regulations that reinvent the wheel of first and second mortgages. We need a return to transparent structures and genuine leeway for bankers who have truly mastered their craft. Basel IV in its current form is not progress--it is a bureaucratic step backward that we all pay for with high interest rates.

Blumenauer Immobilien
Koenigsteiner Strasse 6 Koenigsteiner Strasse 6
65812 Bad 65812
Germany

https://www.blumenauer-badsoden.de

Herr Harald Blumenauer
+49 6196 5602300

h.blumenauer@blumenauer-badsoden.de

The Blumenauer brand stands for decades of experience, high professionalism, and deep market understanding in the real estate sector. In addition to its traditional activities as a broker and consultant, the company supports private and commercial clients from the initial idea through to the successful conclusion of a contract.

A particular focus is on building the BLUMENAUER brand cooperation network, which connects real estate professionals and startups throughout Germany. Partners benefit from the strong brand, state-of-the-art joint marketing, knowledge transfer, and a close exchange of experience--with the goal of operating even more successfully in the market as part of a strong network.

This release was published on openPR.