La. Stat. tit. 33 § 113
A planning commission shall approve or disapprove a plat within sixty days after the submission thereof to it; otherwise such plat shall be deemed to have been approved, and a certificate to that effect shall be issued by such commission on demand. The applicant for a commission's approval may, however, waive this requirement and consent to an extension of such period. The ground of disapproval of any plat shall be stated upon the records of such commission. Any plat submitted to such commission shall contain the name and address of a person to whom notice of a hearing shall be sent; and no plat shall be acted on by such commission without affording a hearing thereon. Notice shall be sent to the said address by certified mail of the time and place of such hearing not less than five days before the date fixed therefor. A planning commission shall give notice of such hearings, including the purpose, time, and place, by at least one publication in a newspaper of general circulation in the area surrounding the proposed subdivision, not less than five days prior to the hearing date; provided, however, that in parishes or municipalities with a population in excess of one hundred fifty thousand, the public hearing may be waived by the planning commission or planning authority for subdivisions creating five or less lots not involving the creation of any new streets, and provided further that the provisions in such waivers shall be clearly set forth in the official subdivision regulations. Every plat approved by a planning commission shall, by virtue of such approval, be deemed to be an amendment of or an addition to or a detail of the official plan and a part thereof. Approval of a plat shall not be deemed to constitute or effect an acceptance by the public of any street or other open space shown upon the plat. A planning commission may, from time to time, recommend to the local legislative body amendments to the zoning ordinance or map or additions thereto to conform to such commission's recommendations for the zoning regulation of the territory comprised within approved subdivisions.
In the case of a parish planning commission, such requirements or restrictions shall be stated upon the plat prior to the approval and recording thereof and shall have the same force of law and be enforceable in the same manner and with the same sanctions and penalties and subject to the same power of amendment or repeal as though set out as a part of a zoning ordinance or map.
La. R.S. § 33:113