Building envelopes are essential for supplying buildings with appropriate energy and thermal comfort performance. Recent research on novel strategies and methodologies applies improved solutions in this area. With a specific focus on phase transition materials, the primary methods used in this area are examined to find contemporary and efficient procedures. Due to phase change materials' (PCMs') enhanced capacity to store and release heat during phase transition, this technology is expanding rapidly and is utilized in various building components. This study emphasizes the value of PCMs in building envelope systems, particularly on the roof and exterior wall applications. In what follows an overview and discussion of PCM types, general and desirable qualities, and potential uses is presented. The thermal behavior of PCM is described using incorporation techniques and procedures, influential parameters, basic numerical tools, and modeling equations. A thorough review based on current research has been carried out to highlight the potential of PCM with the best approaches in various places. In addition to various research pauses for future investigations, the primary findings of PCM thermal performance have been discussed, taking into account the decreased cooling/heating load, energy savings, and increased thermal comfort.