The focus on improving the sustainability of low-income building projects is increasing and its contribution towards adding more values is becoming visible. Government authorities responsible for the construction process need to deliver sustainable buildings in terms of being: on time, cost effective, high quality, good indoor environment, durable, cheaper maintenance, and user friendly. On the long run continuous improvement to achieve year-on-year reduction in project cost and time is expected to be accomplished. In order to improve sustainability for low-income building projects, it is necessary to assess the performance of these buildings to identify their deficiencies and faults to take corrective actions and enable government authorities improve the performance of new projects. Towards this aim, the paper attempts to accomplish three main objectives: First, to propose a set of Key Performance Indicators to Assess Building Performance (KPI_ABP). This objective is achieved through the review of literature related to assessing building performance and sustainable development in construction. Second, to test the proposed KPI_ABP set in assessing the performance of actual buildings.