7-2-3: SUPERVISION; INSPECTION:
   A.   Supervision; Certificate Of Approval: All sidewalk construction and repair work shall be under the direct supervision of the street superintendent or the city engineer, and it shall be his duty when any construction or repair work has been completely finished in accordance with the ordinances relating to the same to issue a certificate of approval, a copy of which shall be filed with the city clerk. A copy of the said certificate shall be given to the contractor and a copy to the owner of the property.
   B.   Inspection; Lien Claim: No right of action for work done or labor or materials supplied on any contract for sidewalk construction or repair shall arise nor shall any materialman's or laborer's lien be held to be established until the inspector has approved the work and issued and delivered his certificate of approval to the person claiming such rights or lien.
   C.   Completion Of Work; Issuance Of Certificate: The certificate herein mentioned shall be issued only after the completion of the work and shall certify that the work and materials in all respects comply with the city ordinances. (1980 Code § 19-18)