Abstract-This research focuses primarily on modelling of an existing building using Revit architecture and importing the model in energy analysis software Green Building studio, applying the energy efficient parameters for light and thermal energy in order to obtain the optimum energy saving and minimise the loss of energy in the building. In this context, subject building refers to the existing building which is individual residential home located in Tambaram IV. INTRODUCTIONRetrofitting an existing building can oftentimes be more costeffective than building a new facility. Since buildings consume a significant amount of energy, particularly for heating and cooling, and because existing buildings comprise the largest segment of the built environment, it is important to initiate energy conservation retrofits to reduce energy consumption and the cost of heating, cooling, and lighting buildings. II. BUILDING INFORMATION MODELLINGBuilding information modelling (BIM) is a new way of approaching the design and documentation of building projects. BIM Models and manages not just graphics, but also information that allows the automatic generation of drawings and reports, design analysis, schedule simulation, facilities management, and more ultimately enabling the building team to make better-informed decisions. A. Revit architectureThe energy analytical model feature in Revit building design software provides tools for fast, flexible creation of models for energy simulation. Autodesk Revit Architecture software provides architects the tools to easily capture and analyse design concepts, and more accurately maintain coordinated and reliable design data through documentation and construction.Energy analytical models are created to suit different design stage needs, workflows and precision preferences. A model to be created directly from architectural building elements and room/space elements, or manually using conceptual massing.

Nanotechnology is a growing discipline in research and developments. It engages scientists in involving themselves in the production of efficient nanomaterials and study of their performance. Nanotechnology has been majorly concerned about its contributions in the field of microbiology, medicine, electronic, chemical and material sciences. However, its involvement has been increasing in the field of construction. The objective of the study is to review the role of nanotechnology in civil engineering applications. It serves as a Phase Change Material (PCM) making it energy efficient. Nanoconrete enhances various properties with different nanomaterials. Nanotechnology in wood and glass improves the bond between the fibres. Nanotechnology in coating makes the surface easy to maintain and not to be spoiled by dirt. It has been found that the role of nanotechnology in the civil engineering discipline will definitely result in a new generation of construction materials with increased performance, strength, durability and other properties.