Recently, control systems are being integrated to an increasing number of buildings, which are then labeled as “intelligent”. Even though the intelligence label creates a considerable market share, intelligence-indicator building control systems are under-researched in terms of the expectations of customers. This thesis analyzes customer satisfaction for intelligent building control systems by assessing expected and perceived service levels that reveals service quality. In order to achieve this, two web-based surveys inquiring both the importance and the performance levels of control systems were conducted. The collected data were then analyzed by a customer gap analysis depending on an importance-performance analysis. Among the seven control systems investigated, building automation system is found to be the most important intelligent control system integrated to a building. Yet, it is also found to be one of the underperforming control systems investigated. Thus, the largest customer gap indicating the lowest service quality is defined for building automation system towards which managerial effort and concentration should be directed urgently for proper improvement purposes. Heating, ventilating and air conditioning system shows the second largest customer gap that constitutes the second highest priority. Although, vertical transportation system is found to be one of the most under-performing control systems, since it is also found to be the least important intelligent control system, it has the lowest customer gap, which indicates low-priority. The findings of the thesis could be of help to develop effective strategies for the management policies of construction and building automation companies.