Motivation is one of the factors that influence the productivity of people. Engineers play a vital role in the management of projects in a construction organisation. The success of these projects relies heavily on their active involvement and effective performance. Hence it is important to assess the impact of motivation on the performance of these engineers. The broad objective of this work is to assess the impact of motivation on the performance of these engineers. The specific objective of this paper is identifying the key factors that cause motivation and de-motivation in engineers. Literature survey, expert opinion and semi-structured interviews were conducted to find these factors. A structured principal questionnaire survey was carried out among 100 engineers from the Central Public Works Department (CPWD). Analytical Hierarchy Process (AHP) was used to find the weightages for the key factors. Using these factors to conduct specific motivational programmes will help in improving the productivity of people on a project.