Border development

Boundary Construction - Boundary construction occurs when a building is erected directly on the property line or at a distance that is less than the standard setback. It is permitted only under certain conditions set forth in building codes and often requires the neighbor’s consent.

When is a building on the property line permitted?

The Bavarian Building Code (BayBO) stipulates in Section 6 that buildings must maintain setbacks from property lines. However, there are several exceptions to this rule that allow for a building on the property line.

The most important exception concerns garages, carports, and outbuildings. In Bavaria, these may be built directly on the property line, provided that the wall height does not exceed three meters and the total length along each property line does not exceed nine meters. Neighbor consent is not required under building regulations for this, although informing the neighbor early on helps avoid conflicts.

Boundary construction with the main building is permitted if the zoning plan specifies a closed building style (symbol “g”). In a closed building style, buildings are constructed without a lateral setback and form a continuous row of houses. This is typical of inner-city perimeter block development and historic old town districts.

Even in the case of single-sided boundary construction on the neighboring property, an extension to the shared boundary may be permitted if your own project corresponds to the existing boundary building. In this case, it would be illogical to maintain a setback from a boundary where a neighboring building already stands.

Furthermore, the building authority may grant an exemption from the setback regulations if special circumstances exist and the interests of neighbors are not unreasonably impaired. However, such an exemption requires that compliance with the standard setbacks would result in undue hardship.

Neighbor Consent and Fire Safety

Unless the zoning plan provides for closed construction and no statutory exemption applies, consent from the affected neighbor is generally required for construction on the property line. This consent should be obtained in writing and attached to the building application. A private-law agreement alone is not sufficient-what matters is the eligibility for approval under public law.

Fire safety deserves special attention. Boundary walls must be constructed as fire walls to prevent fire from spreading to the neighboring property. The BayBO requires fire walls to have a fire resistance rating of at least 90 minutes (REI 90 or EI 90) and to be constructed of non-combustible building materials. This requirement applies regardless of whether a building already stands on the neighboring property and often results in additional costs compared to a standard exterior wall.

Practical Tip for Nuremberg and Franconia

In Nuremberg neighborhoods such as the Old Town, Gostenhof, or St. Johannis, closed-block construction is widespread. Anyone planning to fill a gap or expand an existing row house here must construct the boundary wall as a standard-compliant fire wall and carefully plan the connection to the neighboring building.

For any project involving a property boundary, we recommend first reviewing the applicable zoning plan and submitting a preliminary building inquiry to the City of Nuremberg or the relevant district office. This allows you to clarify at an early stage whether the boundary construction is permissible under planning law and what requirements-particularly regarding fire safety-are to be expected. A clarifying discussion with the neighbor before planning begins prevents lengthy legal disputes and spares nerves on both sides.

Frequently Asked Questions

Do I always need a neighbor’s consent for boundary construction?

Not in every case. For exempt projects such as garages and carports with a wall height of up to three meters, or where a closed construction style is specified in the zoning plan, no consent is required. In all other cases, the neighbor must agree to the reduction of the setback distances. If the neighbor refuses, the building authority can only grant an exemption under strict conditions.

What setback requirements apply to garages on the property line?

In Bavaria, garages and carports may be built directly on the property line without setbacks if the wall height is no more than three meters and the length along the line is no more than nine meters. If these dimensions are exceeded, the standard setback regulations apply. Multiple structures on the same side of the property line are added together for the total length.

What happens in the case of unauthorized construction on the property line?

Construction on the property line carried out without a permit or in violation of setback regulations can have serious consequences. The building authority may impose a construction freeze, prohibit use, or order demolition. In addition, the affected neighbor has the right to take civil action against the builder and demand removal or compensation for damages. The costs of demolition generally exceed the costs of proper planning by a significant margin.

Boundary Structures and Valuation When Buying Real Estate

When purchasing a property with existing boundary structures, a careful review of their legal compliance under building regulations is essential. Boundary structures erected without a permit or without the necessary neighbor consent can significantly impact the property’s value-because a demolition order from the building authority is still possible even years later if the authority becomes aware of the unauthorized construction.

Before purchasing a property with boundary structures, we recommend reviewing the following documents:

• Building permit for the boundary structure (garage, extension, outbuilding)
• Entries in the register of easements (setback agreements with neighbors)
• Provisions of the zoning plan regarding construction type (open, closed, deviating)
• Check the land registry and easement register for existing agreements

An appraiser or building expert can assess the legality of the existing boundary structure as part of the due diligence process. We work with experienced experts in Nuremberg and the surrounding region and help coordinate this review.

Boundary Structures Between Neighbors: Rights and Obligations

If there is already a garage or an extension on the neighboring property, the question arises as to what rights and obligations the other neighbor has. In Bavaria, the general rule is: Anyone wishing to build an extension to an existing boundary structure must use the neighbor’s boundary wall or erect a fire wall themselves. For the shared use of an already existing boundary wall, the neighbor may demand compensation for wall costs-this is regulated in the Civil Code and in Bavarian neighbor law.

Furthermore, the addition must not obscure any windows or ventilation openings of the neighboring building, unless the neighbor expressly consents. Any agreements regarding the shared use of a boundary wall or the waiver of compensation claims should be notarized and secured as a building encumbrance or a private-law easement so that they remain valid for future owners. We recommend clarifying such arrangements before construction begins and setting them forth in writing-verbal agreements between neighbors are often the basis for later disputes in practice.

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