Estimated Costs of the 2018 IRC Code Changes

The National Association of Home Builders (NAHB) provided a list of code changes approved for the 2018 International Residential Code (2018 IRC). Home Innovation Research Labs (Home Innovation) estimated the expected cost impact of these code changes on construction practices and materials for a number of reference houses sited in various cities nationwide. Cost estimates are aggregated in ranges of high to low based on various methods or components that might be used to comply with the code.