This course reviews the current building codes for family residences and existing and/or historic buildings. You will want to investigate the appropriate codes locally and nationally for your specific scenario to accomplish a complete and lawful project. The building codes consider residential occupancies to be single-family homes, two-family homes, duplexes, and townhouses not more than three stories above grade plane. The International Residential Code (IRC) includes building, fire protection, plumbing, mechanical, and electrical code requirements for these residential buildings. The IRC also refers to a variety of standards. Family residences do not have as many interior-related regulations as other buildings, but a number of interior codes and standards are still required. Codes will apply to interior projects in existing buildings and historic buildings the same way they do for a new building much of the time. Be sure you are familiar with the four categories that define an existing building and the two additional conditions that identify a historic building. You can avoid many issues that could arise later by doing your research early.