Green libraries are an exciting topic for creating environmentally friendly buildings. Libraries are synonymous with book lending services and comfortable reading rooms. The green library concept will be in line with increasing the comfort of library visitors. Libraries with large buildings need room maps for visitors to find room information. This research aims to create a room map with the concept of Augmented Reality (AR). Room maps generally use 2D images that provide information or instructions for all rooms in a building. The Augmented Reality approach as a 3D-based room map will undoubtedly provide a different experience to library visitors. Creating an AR room map will apply the Multimedia Development Life Cycle (MDLC) method. This method is suitable for application in multimedia product development. However, the resulting product is not only used as room map information but can also be used as a library promotional tool.