The church is rather narrow and consists of a nave and two side aisles of the same height, unifying inner space as in a hall church, a characteristic that would be found in later Manueline spaces like the nave of the Jerónimos Monastery of Lisbon. Each pillar of the nave, supporting a pointed arch, is composed of three intertwined subcolumns in rough granite. These spiralling columns would also be a typical theme in later Manueline buildings, like the Guarda Cathedral. The side aisles are supported by semi-barrel vaults.