This chapter is dedicated to an exploration of the different ways in which Romano-British houses were constructed. The choice of whether to build in timber or in clay, in brick or in stone, was critical. All of these materials were used in Roman Britain, and the different techniques employed involved sophisticated craftsmanship. The methods adopted were the consequence of cultural, social and economic choices; and the result was a varied architectural landscape, incorporating diverse colours, forms and textures. Previous studies have understated this variety and it is consequently worth exploring the evidence in some detail. The nature of archaeological survival is such that this chapter is mostly about walls and foundations. A hierarchy of choice can be described, from the versatility of timber to the monumentality of masonry.