In the 2015 redesign of the American Housing Survey (AHS), a new variable, GUTREHB, was added to the questionnaire to identify owner-occupied units that had undergone transformation within the previous 10 years. The authors believed that GUTREHB could potentially provide important information on how the housing stock evolves. This paper provides background on the GUTREHB variable; uses data from the 2015, 2017, and 2019 AHS surveys to assess its reliability and usefulness; and explores possible ways to make the variable more useful.  In determining its reliability and usefulness, the authors found that responses to GUTREHB are inconsistent across surveys, associated with low levels of remodeling costs, and are weakly associated with other relevant variable in the AHS.  Ideas to make it more useful include restricting the variable to what has happened to the unit since the last AHS survey instead of the last 10 years, expanding GUTREHB to vacant units, providing more guidance to respondents about what constitutes "gut rehab," and replacing the current yes-no question with a series of questions that depict more accurately the work performed.