This paper presents the design and fabrication of a Window Climbing Robot (WCR), which is a small-scale or miniature robot that is capable of 'climbing' the windows or glass in a vertical motion. While operating in the vertical motion or 'climbing', the WCR has the capabilities in performing tasks such as cleaning, inspection, surveillance and maintenance. The WCR can perform these duties without the need of actual human intervention. The robot is able to operate autonomously with the aid of sensors. The robot can be placed onto the surfaces such as glass using the pneumatic-system with suction-power provided by eight suction-cups. The double-belting gear driving mechanism moving the robot is shown and explained. The pneumatic-based suction system is illustrated and the fabricated prototype of the robot is also shown in this paper.