This is on going project using sustainable method of thermal insulation by using Polystyrene in between wall.Using Polystyrene insulation actively contributes to a better environment during the entire working life cycle of the building. It offers substantial environmental advantages through energy saving and greenhouse gas emission reduction and is therefore ideally suited to the creation of environment-friendly new building projects. It is easy to handle, safe, non-hazardous and has proven constant mechanical and insulation properties for the life time of the building in which it is used. It doesn’t contain or use any ozone depleting chemicals at any stage of its life cycle. Advantage• Comfort: The temperature of the room remains cool in summer and warm in winter than that of outside atmosphere. Therefore, by providing thermal insulation one feels comfort both in summer and winter season. • Fuel saving: Fuel is required to maintain desired temperature of the room. By providing thermal insulation, the transfer of heat/cold reduces between inside and outside of the room.. Hence, it saves fuel.• Condensation Resistant: Thermal insulation materials fixed on inside surface of the room walls prevent condensation on interior walls and ceiling. Condensation is deposition of moisture and takes place when warm air comes in contact of surface having temperature below dew point.