At his discretion, examine or cause to be examined all buildings, structures, signs, and/or land or portions thereof for which an application has been filed for the erection, construction, alteration, repair, extension, replacement, and/or use before issuing any permit. Thereafter, he may make such inspections during the completion of work for which a permit has been issued. Upon completion of the building, structure, sign, and/or change, a final inspection shall be made and all violations of the approved plans or permit shall be noted and the holder of the permit shall be notified of the discrepancies.