(The information below is excerpted from the 2012 Building Code Basics series.)
Provisions for accessory buildings consider the buildings accessory to and incidental to the dwelling. Provisions for existing buildings allow the legal occupancy of buildings to continue without fully complying with current codes. As with other International Codes, the International Residential Code (IRC) provides relief for existing buildings.
Click to continue reading more on accessory and existing buildings from the Building Code Basics: Residential, Based on the 2012 IRC.