Existing inefficient building stock contributes high volume of energy consumption, and 85% of the predicted building stock in the year 2050 is already built [36]. Many governments and relevant communities make a lot of effort on the decarbonising in the construction industry, and BIM is at the center of controversy. BIM based technology to enhance the energy performance have improved in short period intensively over the last decade [39][43], mainly been used in the early stage of design and construction phase [3]. Efficient ways for contributing retrofit and refurbishment project still lies behind in practical implementation [39], where has great potential for the buildings to be extension their life or to return to 2nd Gradle …show more content…
While some companies using conventional process still stay 2D CAD & paper based or working both 3D & 2D system at the same time[ % ], others use 2D Drawings to convert to 3D model as indispensable [ % ]. A few participants only use integrated BIM model covering whole buildings ' life cycle [ % ]. By passing over the different participants in the construction project, where is a gap in the flow of data [37], it remains unclear as-build drawing or as-build model, involving design clashes, omissions, and …show more content…
[34] insisted that ‘Nowadays, there is a great number of building retrofits technologies that are readily available in the market’. The author, however, highlights the importance of choosing appropriate retrofit technology or measure for a particular project that has different building systems, conditions, and purpose for retrofitting. By integrating BIM output, as a result, well-informed retrofit decisions can be progressed favourably among different