This article focuses on a case study concerning a rehabilitation intervention in a flat located in Lisbon, which was carried out incorrectly, with the errors of this intervention becoming apparent and worsening over time. It presents an intervention methodology, based on the survey of existing pathologies, for the subsequent implementation of a rehabilitation process aimed at reversing the errors caused by the initial rehabilitation work. The purpose of this article is not to present a solution or a new design for the space in question, but rather to highlight the various constraints inherent to a rehabilitation process, which are often overlooked due to time and economic considerations.