This paper aims to establish a methodology to originate compact architectural forms that ensure efficient thermal performance and indoor environment by exploring appropriate compact morphologies during the early stage of the design process. Compactness, in the recent literature, associates to the thermal efficiency of geometries regardless to their indoor environment, and yields particular constant proportions of the geometry dimensions independent from building type, volume, or site conditions. No consensus of opinions exists for identifying the efficient proportion of compact forms which revealed contradicted findings. This paper adopted the thermal and environmental performance requirements, that interoperates with the building design functions, as generators to originate compact architectural forms. The standard rate of horizontal surfaces of the thermal envelope by volume has been derived which in conjunction with the standard rate of vertical surfaces of the thermal envelope by volume and their sum can evaluate the environmental and thermal performance of a morphology. This paper derived the mathematical equation that can calculate dimensions of preliminary compact morphologies which can be cast to match functional design requirements, and comply to the standard rates of vertical and horizontal surfaces by volume to originate compact architectural forms. By the paper methodology, many alternatives of new morphologies can be originated, investigated, and developed to satisfy design functions, indoor environment, and energy requirements.