Residential building inspector

Which do not fall under the purview of the international residential code? Any building larger than a two-family dwelling I.E. an apartment building Which of the following requires a permit? A. installing a new central heating and cooling system B. installing a through the window air conditioning unit C. replacing an existing lamp attached to the ceiling of an interior hallway D. installing portable heating units A. installing a new central heating and cooling system The international residential code requires which one of the following? A. plans must be submitted in electronic media B. the approved plans shall be kept at the site of the work C. the building official retains the plans for 7 years after completion of project D. construction documents must be prepared by a registered design professional B. the approved plans shall be kept at the site of the work