Phase Change Materials (PCM) play a critical function in stabilizing temperature variations and storing energy across various practical applications, including electronics, the automobile industry, and buildings. This study focuses on the utilization of phase change material in structural implementations, specifically addressing the incorporation of phase change material within building materials to enhance thermal storage capacity. The physical aspects of phase change are tackled through a mathematical investigation based on the Finite Element Method (FEM). The chosen phase change material is directly integrated into building materials, aiming to augment their thermal storage capabilities. Two distinct building materials, commonly used in residential construction, are examined. Numerical results are validated against a prototype, and the associated inaccuracy is projected. The findings underscore the capacity of PCM to improve the thermal capacity of walls, efficiently reducing interior surface temperature fluctuations. Moreover, an increased PCM filling amount enhances the thermal response of building materials, improving separation and additional power stored as hidden heat.