La. Civ. Code art. 804
Current with operative changes from the 2024 Third Special Legislative Session
Substantial alterations or substantial improvements to the thing held in indivision may be undertaken only with the consent of all the co-owners.
When a co-owner makes substantial alterations or substantial improvements consistent with the use of the property, though without the express or implied consent of his co-owners, the rights of the parties shall be determined by Article 496. When a co-owner makes substantial alterations or substantial improvements inconsistent with the use of the property or in spite of the objections of his co-owners, the rights of the parties shall be determined by Article 497.
La. C.C. § 804