When Can a Neighbour Challenge Your Building Project? The Supreme Administrative Court Clarifies

The Supreme Administrative Court recently dealt with a case that fundamentally changes the view of which objections the owner of a neighbouring property may raise against a neighbour's building project. Decision No. 1 As 38/2026-65 offers important guidance for anyone who finds themselves next to a planned building — and equally for developers and builders who need to know which objections they must anticipate.

The case concerned a permit for a building designated as a family house in the municipality of S. in the Šumava region. The owner of the neighbouring plot — let us call him Mr P. — challenged the permit on a whole range of grounds. He argued that the building was in fact a guesthouse rather than a family house, that it had no secured legal access, that there were too few parking spaces, and that the project documentation was defective. The Regional Court in České Budějovice rejected most of his objections, holding that Mr P. was not entitled to defend the rights of third parties or to act as a general guardian of legality.

When a neighbour has a say in your building project

The Supreme Administrative Court agreed with the regional court on several points but set its judgment aside on the key questions. It confirmed that a neighbour cannot object that a building encroaches on the land of another owner — that is a matter for that particular owner. Nor can a neighbour raise general defects in the project documentation or sewerage problems that do not directly concern him.

The real breakthrough, however, came in the assessment of the objections concerning parking and access to the building. The regional court had dismissed Mr P.'s concern that visitors' vehicles would park on his land as mere speculation. The Supreme Administrative Court sharply disagreed.

The court pointed to the specific circumstances: according to the fire-safety design, the building has a capacity of up to 18 people, the second floor contains six rooms with their own bathrooms, and there are two separate entrances. Access to the builder's plot runs across municipal land under a lease that is, by its nature, temporary. In such a situation, a neighbour's concern that vehicles will cross the surrounding land and park nearby is not unfounded — on the contrary, it is entirely logical.

The court's key conclusion: a breach of the rules on providing parking and on connecting a building to the road may genuinely burden the building's surroundings and interfere with a neighbour's rights. The neighbour is therefore entitled to raise these objections, and the court must address them on the merits.

A family house, or a hidden guesthouse?

An interesting part of the decision concerns whether the building actually corresponds to its declared purpose. Mr P. argued that the layout — six rooms with en-suite bathrooms, a capacity of 18 people — clearly showed it was in fact a guesthouse, which the zoning plan prohibits in that location.

Here the court took a more measured position. It accepted that the layout does create the impression of accommodation facilities and that the neighbour's concern is understandable. At the same time, it held that the layout alone does not allow the future manner of use to be prejudged. What matters is whether the building can serve its declared purpose — and a family house with a larger number of bathrooms still fits that definition.

The court even remarked, with a degree of exaggeration, that a builder cannot be blamed for anticipating that members of his family may more frequently face „problems of a faecal nature“ and therefore fitting the property with eight toilets. If, however, the building were in future used as a guesthouse contrary to the occupancy permit, the tools of building law would then be available.

Several important lessons for practice follow from this case. Builders and developers must reckon with neighbours legitimately objecting to inadequate parking and access where those shortcomings may realistically burden their land. It is not enough to state generally that „any free space“ will do for parking. Likewise, a temporary lease of an access road may be problematic.

For owners of neighbouring properties, it is important to know that their objections must always aim to protect their own rights, not those of third parties or general legality. The court clearly distinguishes legitimate concerns — such as strangers' cars parking on one's own land — from an attempt to block a neighbour's building outright.

The matter now returns to the Regional Court in České Budějovice, which must assess on the merits whether the parking and access comply with the law. The outcome may affect not only this specific building in Šumava but also similar cases across the country.

Source: Supreme Administrative Court, 1 As 38/2026-65