Extension to shared wall: What you need to know

Questioner

Does it make a difference whether I want to build a 3-metre high extension on the shared wall or on a lake against the property boundary?

Lawyer

In short: if you want to build against the property boundary, you will need permission from the neighbours in principle, as it is their property. In the case of a shared wall, you can normally build without permission. However, you must take into account the height of the extension as it applies in the local by-law of the municipality. For more information or assistance, please feel free to contact me directly and without obligation.

Lawyer

In the case of a shared wall, it is permitted to build against the wall without permission, provided that no further than half of the wall is anchored. If the wall is built on, the function of the wall changes from a property boundary to part of a building, for this reason, permission from the neighbours is required for building on the wall.