CCQ-1991 - Civil Code of Québec

Full text
956. The owner of an immovable becomes the owner by accession of the constructions, works or plantations he has made with materials which do not belong to him, but he is bound to pay the value, at the time they were incorporated, of the materials used.
The previous owner of the materials has no right to remove them nor any obligation to take them back.
1991, c. 64, a. 956.