A biocorridor on your plot: nature that can dictate where you can’t build
When studying a zoning plan, you may encounter the term ÚSES (the territorial system of ecological stability), whose key component is the biocorridor. It is a designated area that may not look “special” on the ground, but acts as an essential “bridge” for plants and animals migrating between ecological core zones.
The problem arises when such a corridor crosses a buildable parcel. A biocorridor is protected under nature and landscape protection law, and interventions are subject to strict approval. In practice, this means that within the corridor area it is almost always forbidden to place buildings, fencing, or terrain modifications that would block its permeability.
You will not discover the corridor by looking at the plot or by reading the land registry extract. The information lives primarily in the graphical part of the municipality’s zoning plan (main drawing or public-interest infrastructure drawings). Biocorridors are classified as local, regional, or supra-regional, and higher-level corridors often come with additional protection buffers that can extend tens of meters beyond the mapped line.
If a corridor runs through the middle of your land, you may find that although the plot size looks generous, the truly usable building area shrinks to an impractical fraction.
The main risk is the rigidity of these zones. While some constraints allow exceptions, a biocorridor is treated as a public interest. A building authority will not approve your project without a positive binding opinion from the nature protection authority.
That authority may require, for example, a minimum distance for the house or fencing that remains permeable (no continuous solid base that would stop small animals). In extreme cases, the presence of a biocorridor can result in a complete ban on construction on a parcel, even if the listing calls it “buildable”.
Before signing a purchase contract, it is therefore essential to obtain official planning information or consult directly with the environmental department. If a biocorridor is involved, have a professional (designer or an ÚSES specialist) precisely delineate its boundaries on site.
Only then can you know whether your future house will fit into the remaining area. Ignoring a biocorridor can lead to long disputes with authorities and, ultimately, buying expensive land you can use only as a meadow.
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