The Church of Sant Agustí was designed by Pedro Groillez de Servier. Construction was finished in 1819. The church features the habitual characteristics of churches on the island: it resembles a fortress and has great simplicity in its decoration, most notably, its broad stone walls. As is common, the façade is whitewashed and has very little ornamentation aside from the stations of the cross.
It also has no porch. Inside there is a single nave with a barrel-vaulted ceiling and chapels, two on each side of the main altar. It is the only church on Ibiza not facing south but north, because during its construction, two influential families fought to get the church built on their land.
Behind the church and connected to the main part is an adjacent building for use as the parish priest's house.