1. A co-owner of a common wall who has a serious interest in raising it may do so at their own expense, provided that this does not cause material harm to their co-owners. They shall maintain the wall and reinforce it so as to bear the load resulting from the heightening without impairing its capacity. 2. If the common wall is not fit to bear the heightening, the co-owner who wishes to heighten it shall rebuild the entire wall at their own sole expense, so that any increase in thickness lies, as far as possible, on their side. The rebuilt wall shall, apart from the raised part, remain common, and the neighbour who effected the heightening shall have no right to compensation.
Interpretation and application must be checked against the official text and current version.