Although automation has advanced in manufacturing, the growth of automation in construction has been slow. Conventional methods of manufacturing automation do not lend themselves to construction of large structures with internal features. This may explain the slow rate of growth in construction automation. A promising new automation approach is layered fabrication, generally known as rapid prototyping. Although several methods of rapid prototyping have been developed in the last two decades, and successful applications of these methods have been reported in a large variety of domains (including industrial tooling, medical, toy making, etc.), currently Contour Crafting (CC) seems to be the only layer fabrication technology that is uniquely applicable to construction of large structures such as houses.