The objective of the thesis is to develop an example of research methodology about The Urban Form, presenting a new interpretation of the place on Regomir, located in the city of Barcelona. I believe this analysis exercise is fundamental to the Rehabilitation of Urban Forms and Architecture in general. Prior to the development of the practical part of the work specified in the case of Regomir, the thesis sets forth a discourse that frames the subject of Rehabilitation from the theoretical angle. In the first chapter, the section for the bibliographical comments describes the entirety of situations that have played a role in shaping the history of the rehabilitation of architecture in the last century, formalising the background in order to have a broader vision available for current reality. To finish, the bibliographical comments contain the entirety of data published that are part of the secondary documentation collection used in my subsequent research about the specific case of Regomir. The second chapter describes the predisposition, training and planning of architecture as a veritable tool for protecting our heritage, reaching an in-depth understanding the Rehabilitation as a Planning Attitude. The objective of the third chapter of the thesis, The Case of Regomir, is to develop a concrete case for the analysis of Urban Form, providing an overall vision of the strategies of the method. This exercise allows you to draw closer to the formal, constructive and functional logic of the Urban Form of a place that has been known for centuries as El Regomir, located in the municipality of the city of Barcelona, currently coinciding with the area of this city where the carrer del Regomir is located. The current Carrer del Regomir is located on the southern side of the Gothic neighbourhood of the historic centre, starting at the Plaza of Regomir and ending at Carrer Ample. The concrete research subject arose from an interest towards an ancient and long-standing building located on a section of the street with the same name, shaping a large part of its morphology, currently identified with the numbers 11-19 on this street. The work proposes to carry out a search arising around a specific architectural work, but tightly linked to the sector it is part of, with the text and context as two intentions in themselves, forming part of a single process and a single conceptual unit. The concrete study of this place shall provide data about the customs, the economy, the needs, the construction and the architecture of the city in its training process. The study of El Regomir is presented as a methodological example in order to understand professional attitudes about rehabilitation, based on a necessary understanding prior to all Rehabilitation Projects, showing the search strategies that propitiate a project that is in dialogue with its environment. The methodology used can be extrapolated in order to research and learn about other fragments of the city that as of today have yet to be studies. Therefore, the efforts taken in the sector of El Regomir will help to understand the history of the Urban Forms of Barcelona, setting forth the strategies to be used for the study of the Catalan Urban Form in general. The value -but more general than I consider in the presentation of this work- is to transmit an attitude and a learning method in the field of rehabilitation, which is applicable to any level of architecture, from the seemingly simplest architecture to the most complex and renowned. This document develops a fragment of the Urban Form of Barcelona, where there will be an opportunity to work with extremely diverse documentation, a fact that comprehensively illustrates the possibility of searching for the method. All architects, in every rehabilitation project that they are appointed to, must know how to access all possible existing documentation and determine the objectives and the limits of their search. In my opinion, the true value of the thesis written lies in this most general appreciation.