The use of off-site fabricated elements has been found to increase both the quality and speed of construction of buildings formed from steel, concrete and timber. However, the use of off-site fabricated masonry elements has been less common, with traditional on-site methods continuing to dominate. However, these methods are labour-intensive and time-consuming, reducing the competitiveness of masonry as a construction material. With stone masonry representing a potentially attractive low embodied carbon alternative to steel and concrete, resolving this issue has now become a high priority. Thus this contribution considers application of digital design and off-site fabrication methods in the design and construction of unreinforced stone masonry buildings, with prefabricated wall elements and arched facade elements considered. Although other workers have observed that reinforced or pre-stressed masonry elements are the most obvious candidates for off-site fabrication, given that both construction and in-situ load cases need to be considered, here the focus is on the design and construction of elements forming unreinforced stone masonry buildings. In this case it is shown that optimization can be used to design reusable steel elements to restrain unreinforced masonry assemblages during transportation and construction, with these elements returned to the stonemasons yard for reuse following erection.