Construction projects do differ in their construction methods, type of service, geographical conditions and other influencing factors. Among those classifications of construction projects, a building project is considered the major one. There are so many challenges in the execution phase of building projects due to different reasons. Among these challenges, the performance problem is the major issue observed in building projects due to the inappropriate selection of better tools for performance measurement. The main objective of the study is to measure the performance of public building projects in relation with time and cost aspects using earned value analysis. This is followed by determining the major contributory causes for variations and make recommendations for all construction parties i nvolved in building projects to improve performance based on the study's findings. As a case study five ongoing public building projects were selected and experts from contractors, consultants, clients, and the regulatory body participated. The project's delivery method is design-bid-build. The data were analyzed using Microsoft excel. The S- curves clearly indicate the performance of building projects in three terms such as: Planned value (PV), Earned value (EV), and Actual cost (AC).The results showed that all the selected building projects scored poor time and cost performance. Among all building projects, the digital library scored a maximum value of SPI and CPI of 0.83 and 0.96; respectively. Conversely, the ICT complex recorded a minimum value of SPI and CPI of 0.55 and 0.91; respectively. Bure library project recorded minimum value from all projects with SPI of 0.42. From the questionnaire using RII ranking design modification, change in quantity and delay in receiving approved design on time are the top three major responsible causes by scoring RII of 0.795, 0.773 and 0.753 ; respectively. With all these in the background, it is advised that the owner should set the scope, cost and time of the project based on the building type. Those three points should be given the necessary attention during the planning phase. The consultant should also deliver approved design working document as per schedule. As the top-most overseeing authority, the regulatory body should supervise, ensure timely budget release, and sanction permits properly within the allotted time frame to expedite its rightful function and enhance the performance of such building projects. Key Words: Public building projects, Performance measurement, Earned value analysis, Causes for variations, SPI, CPI