This study investigates two significant components of architectural design, &lsquo / &lsquo / form&rsquo / &rsquo / and &lsquo / &lsquo / space&rsquo / &rsquo / and the basic design elements and principles used in their creation in the context of Roman domestic architecture. It more specifically examines how, by which means and for which purposes certain form and space defining tools such as the column, wall, floor, ceiling and opening with their architectural equivalents as the point, line, plane and volume were used in the atrium houses exemplified in Pompeii in Italy. The study discusses how Romans organized their daily life in reference to certain domestic spaces and how the form and spatial qualities of these spaces contributed to the architectural articulation of the private sphere. By concentrating on a group of recurring domestic spaces including the atrium, garden, and banqueting room and by illustrating the form and spatial composition of these, the study presents an architectural reading of the Roman atrium house.