At least once in each and every year the inspector or his deputy shall make a general inspection of all buildings in the corporate limits and ascertain if the provisions of this chapter are being complied with. The local inspector shall notify the occupant and owner of any premises of any defects found in this general inspection and shall see that they are properly corrected and that dangerous inflammable conditions on the premises are removed. Provided, that the inspector may enter a private dwelling or premise only with the permission of the owner or occupant, unless there exists probable cause to believe that there exists a violation of provisions respecting fire laws, or imminent danger to occupants thereof.