This theses report is about theoretical study of building integrated photovoltaics and to make BIPV integral part of the houses in 3 different climatic locations Manchester (UK), Dubai (UAE) and Lahore (Pakistan). It starts with BREDEM which is about domestic energy models which also describes Domestic energy requirement, procedures and consumption patterns in line with building energy codes and guidelines for low energy buildings in UK. It also includes methods to calculate energy consumption and decide which portion of energy consumption can be replaced by using BIPV.Planning to install BIPV and simulation with PV Syst. is described, analyzed and concluded. Further domestic energy consumption is explained by selecting a family house in Dubai In absence of building energy codes and weather data. BIPV is planned and simulated by using PV Syst. since weather data for Dubai was not available therefore it is simulated by using closest latitude Karachi (Pakistan) data. Lastly domestic energy consumption is explained by selecting a family house in Lahore (Pakistan).Domestic energy consumption is explained by using HVAC system sizing procedures and building energy codes of Pakistan. BIPV is planned and simulated by using PV Syst. The idea behind this study is to investigate about domestic energy models in different climates by selecting a standard family house (3 bed room).Study also includes the patterns of energy consumption in line with the building energy codes and regulations at three locations i.e. UK, Dubai and Pakistan. Procedures to make BIPV integral part of the building to achieve certain SF of the energy consumption and certain part of the energy requirement is to be replaced by using BIPV. Difference in BIPV designs with respect to various climates and the use different components as per climatic conditions.