Application for a permit shall be made to the building official and a permit shall be obtained prior to commencing any of the following activities: Construction, reconstruction, alteration, repair, conversion or demolition of a building or structure, including the installation or altering of any equipment regulated by the USBC; Change of Occupancy of an existing structure when a new certificate is required by the USBC; movement of a lot line that increases the hazard to or decreases the level of safety of an existing building or structure; removing or disturbing any asbestos containing materials during demolition, alteration, renovation of or additions to buildings or structures.
There are a lot of situations (repairs, for one) where a building permit is not required. View Permits required and exemptions to find out what is and is not covered.
View more about building permit requirements online. Permits Required and Exemptions for Permits