Building Type E: How Simpler Building Could Solve the Housing Crisis

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What is Building Type E? — The Idea Behind the Concept

Key Facts -

What is Building Type E? — The Idea Behind the Concept

Cost Potential: 15 to 20 Percent — Under Which Conditions?

The legal architecture: BGB amendment as a foundation

Criticism: What Architects, Tenant Associations, and Experts Object To

Criticism from Tenant Associations

Criticism from Architects and Planners

Criticism from Building Biologists

Conclusion: The right direction, but no panacea

Building Type E stands for “Experimental Building” — a construction category introduced in Germany as part of a Federal Council initiative and the Federal Minister of Construction legislation for 2025/2026. The core idea: Certain DIN standards that go beyond legal minimum requirements may be voluntarily reduced for Building Type E — provided all parties agree and safety standards are maintained.

This sounds technical, but has major economic consequences. A significant portion of German construction costs does not arise from legal regulations, but from industry-standard DIN norms that have been continuously refined and increased over decades. Examples:

Room heights (currently often 2.50 m+ as standard, legal minimum: 2.40 m)
Sound insulation requirements (several classes above the legal minimum)
Thermal insulation thicknesses (beyond the GEG minimum)
Elevator requirements for building heights, underground garage standards, parking space ratios

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Cost Potential: 15 to 20 Percent — Under Which Conditions?

The Federal Ministry of Housing, Urban Development, and Construction estimates the theoretical cost reduction potential for building type E at 15 to 20 percent compared to conventional new construction.

This figure applies under optimal conditions — that is, when several cost-intensive regulations are simultaneously simplified. In practice, the potential is more nuanced:

Realistically achievable: 8–12 percent cost reduction with consistent application
Prerequisite: All parties (developer, tenant/buyer, authorities) must agree
Market penetration: Only once building type E is legally established and courts have issued first rulings will developers be willing to take the risk

For a new build that today costs 9,500 euros per square meter in Munich, a 10 percent cost reduction would save 950 euros per square meter. For an 80-m² apartment, that’s 76,000 euros — a significant lever for projects and buyers.

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The legal architecture: BGB amendment as a foundation

Building type E does not require new building codes, but primarily an amendment to the Civil Code (BGB). Specifically: It must be clarified that deviations from technical standards (DIN, EN) do not automatically constitute a defect if they have been contractually agreed upon.

Currently, according to case law: If a building falls below the usual technical standard, a construction defect is assumed — even if the legal minimum is met. This automatism is the core legal issue that has so far prevented building type E.

The Federal Ministry of Justice has submitted a corresponding draft bill for 2025. Parliamentary approval is planned for 2026, with first pilot projects running in Berlin, Hamburg, and Frankfurt.

Criticism: What Architects, Tenant Associations, and Experts Object To

Building type E is controversial. The objections come from various directions:

Criticism from Tenant Associations

The German Tenants’ Association warns of a two-tier architecture: Wealthy property owners buy premium apartments according to the previous standard, while renters live in buildings with reduced quality standards. The argument: Cost savings go to the investor, not the tenant.

Criticism from Architects and Planners

Parts of the architectural community see building type E as an attack on quality standards developed over decades. Specific concerns: Poor sound insulation leads to conflicts, reduced thermal insulation increases heating costs, and low ceiling heights affect well-being and resale value.

Criticism from Building Biologists

Health aspects — ventilation, moisture protection, indoor air quality — must not be neglected even in building type E. The concern: inexperienced homeowners or profit-driven developers choose cost savings that result in long-term follow-up costs.

Conclusion: The right direction, but no panacea

Building type E is a sensible building block in solving the housing crisis — but not a standalone turnaround instrument. The housing construction crisis has structural causes (interest rates, land prices, approval duration, shortage of skilled workers), which cannot be solved by simplified building regulations alone.

For investors and project developers willing to use the new concept, a real cost advantage arises — but only once the legal situation is fully clarified and market acceptance has been proven by initial pilot projects. Significant market penetration is expected at the earliest in 2027/2028.