Church with a basilica style plan, with three naves separated by columns. Headed by three apses. The central apse has been modified and the lateral ones are semi-cylindrical. A square bell tower adjoins the southern façade: its upper tier has been subject to modifications at a later date. The original murals were removed between 1919 and 1923; copies have recently been made of the murals on both the interior and exterior walls. Among the murals, those depicting the Bestiary repertoire, the stoning of Saint Stephen and a scene with musicians and jugglers are of particular interest.

Sant Joan de Boí was declared an Item of Cultural Interest in 1991. This church forms part of the Catalan Romanesque ensemble of the Vall de Boí (Alta Ribagorça - Spain) and was declared a UNESCO World Heritage Site on 30th November, 2000..