(a) The construction of every new building shall be made under the supervision of an engineer, architect or contractor duly authorized to practice his profession in the Virgin Islands, provided, however, that such supervision is optional on the part of the owner of the building in the following cases:
(1) Wood frame building.
(2) Dwellings of less than three stories.
(3) Business buildings of less than two stories except factories.
(4) Stores and public buildings of less than two stories in height and having a capacity of less than 100 persons.
(5) Government buildings where generally continuous inspection during construction is performed by Government Personnel.
(b) Upon completion of the work, the engineer, architect or contractor under whose supervision it was undertaken, shall submit to the Commissioner a certificate stating that such work was done under his supervision and that in its construction all the provisions of the Building Code and of the building permit issued for that work were complied with.
(c) The above mentioned certificate and copies of the record of the supervision shall be a requisite for the issuance of the Certificate of Use and Occupancy for such building or structure.