The present study deals with the thermal analysis of building bricks containing phase change materials (PCM) when subjected to ambient weather conditions such as solar radiation and ambient temperature. Thermal modelling of building bricks containing PCM has been carried out to utilise the high latent heat of fusion for indoor comfort in buildings. In the thermal model presented in this paper, the PCM is filled in the cylindrical cavity of the bricks. The two-dimensional numerical study has been carried out using finite element analysis method considering heat and mass transfer in the PCM. The effectiveness of PCM in the building bricks has been evaluated by comparing the three different cases - the normal bricks, bricks with air filled in the cylindrical cavity and bricks with PCM filled in the cylindrical cavity. Additionally, the study has also been carried out considering different PCMs, with a varying quantity of single PCM as well as multiple PCM. The obtained results indicate that the Capric acid is more effective PCM in"comparison to the Paraffin and RT-25. The maximum heat flux reduction is found to be 8.31% with Capric acid filled in three cylindrical cavities. From the present study, it is also evident that the application of PCM in building brick could be an effective technique for passive thermal control of buildings. (C) 2017 Elsevier Ltd. All rights reserved.