Every building process is unique and is determined by the project's scale and complexity. However, each time a sustainable house is created, the process follows the same processes, and the concepts apply to smaller-scale projects such as restorations. The main principles are to use energy efficiently, minimize waste, and obtain renewable materials where possible. The first step in creating a sustainable home is determining what type of house you want to build. This decision will guide everything else that follows. There are many different types of houses available, each with their own advantages and disadvantages. It all depends on your needs and how much you can afford. Next, determine how much energy you use now and for how long you expect to use it. This is important because it gives you an idea of how much energy you need to produce or find alternative sources of. For example, if you use a lot of air conditioning in summer and little in winter, then you'll probably need an air conditioner. If your household uses less than 10kW, you may be able to get by with one small appliance. Large households or those who travel a lot may need multiple appliances. After you know how much energy you use, look at the different ways people have been able to reduce their energy bills over time.