The proposal anticipates a new era of fabrication driven by Synthetic Biology and our ability to manipulate living organisms to make new materials and structures. We are also going beyond the usual application domains of Synthetic Biology by applying it to Civil Engineering, expanding design methods and opening up a new area of Engineering Design. To achieve this we will develop a living material which can respond to physical forces in its environment through the synthesis of strengthening materials. This concept is partly biomimetic inspired by for example the way in which our bones strengthen, becoming more dense under repeated load. However, we are also proposing to buid this system using living bacteria cells which have no such functional requirement in nature. Imagine a hydrogel (jelly) containing billions of engineered bacteria. A weight is placed on top of the jelly and, as it is loaded the bacteria in the material sense the mechanical changes in their environment and begin to induce mineral crystals to form. As they make this material the jelly stiffens and strengthens to resist the load. By the end of this project we will be able to demonstrate this principle creating an entirely novel living material. We are working with project partners from across industry and academia to develop this proof of concept and to investigate the broad applications of such a technology to, for example, create self constructing building foundations and make large scale structures where it is very difficult to build using traditional buildings and materials.