The Acropolis Basilica, Sparta, was first excavated by G. Guttle, under the auspices of the British School at Athens, in the 1920s. Two further campaigns were carried out by members of the Athens Archaeological Society, who were not privy to the unpublished excavation daybooks of the British campaign. As a result, 80 years on, the church is still poorly understood; its date and chronological development have been the subject of much scholarly debate, as has its attribution to Osios Nikon. The first phase of a new study of the basilica is now well underway. This consists of non-intrusive study and recording to reach a better understanding of the monument and the previous investigations before new excavations are carried out. The aims of the first phase of the project are to undertake archaeological cleaning of the basilica and its associated buildings to facilitate the production of an accurate ground plan of monuments, the creation of stone by stone elevations of the exterior walls of all the buildings, and the detailed photography of every aspect of the entire basilica complex. Detailed recording of the features exposed in the basilica has been carried out in order to assess chronological phasing (both through context and architecture), use of space within the basilica and potential reconstructions of the edifices. Following the first season of the project, we have a number of preliminary ideas regarding the phasing of the basilica and use of architectural space. In this article we present these ideas, our methodology, a new plan of the monument and its associated buildings and, for the first time, a resume of Cuttle's excavations.