R.I. Gen. Laws § 23-27.3-120.2: Buildings hereafter altered.

No building or structure subsequently enlarged, extended, or altered to change the use group classification, the fire-grading, the maximum live load capacity, or the occupancy load capacity, in whole or in part, shall be occupied or used until the certificate has been issued by the building official, certifying that the work has been completed in accordance with the provisions of this code, the rehabilitation building and fire code for existing buildings and structures, the fire safety code (chapters 28.1 — 28.39 of this title) and the approved permits, and all of the applicable codes of all for which a permit is required. Any use or occupancy, which was not discontinued during the alterations, shall be discontinued within thirty (30) days after the completion of the alteration unless the required certificate is issued by the building official.