This experiment deals with the thermal analysis of cement bricks encapsulated with phase change materials (PCM) when subjected to ambient weather conditions such as solar radiation and temperature. Thermal analysis and modelling of building bricks containing PCM has been carried out to exploit the high latent heat of fusion which will help to improve the indoor comfort in buildings. In the model presented in this paper, the PCM is filled in the central cavity of the bricks after encapsulating in an aluminium container. The experimental analysis is carried out by constructing a model and the heat transfer rate is compared with a similar normal brick and the effectiveness of PCM in the building bricks has been valued. The results show that PCM encapsulation in building brick is an effective practice for passive thermal control of buildings. © Published under licence by IOP Publishing Ltd.