Design of a lunar habitat involves various factors involving systems and habitat design, structural configurations, power, materials, thermal, radiation and life support to name but a few. This presentation will address the issues surrounding the design aspects and properties of materials required to maintain a lunar habitat and to sustain life safety in this harsh lunar environment. Materials selection is a compromise between functionality, safety, performance, heritage, design and environmental aspects- all of which must be considered and taken into account. The presentation will outline details of some semi-rigid materials structural examples used in space including previous inflatable structural habitats, as well as the materials properties between internal habitat human rated factors (where issues of crew safety, flammability off-gassing, toxicity and permeability are pre-dominant) and external aspects (where issues of vacuum compatibility, dust contamination, micro-meteoroids, outgassing, cosmic , ionising and non ionising radiation are predominant). Materials options for alternative design choices are also considered along with current technology needs for habitable structures.