Level III Inspection: A level III Chimney Inspection is the most comprehensive type of Chimney Inspection. It includes all of what is included in both level I and level II Chimney Inspections. A level III Chimney Inspection will also examine concealed parts of the chimney. This could also include the removal of certain parts of a structure if necessary. This type of inspection may cause damage to the structure. A level III Chimney Inspection is performed when serious damage is suspected to a chimney.