St. Gregory’s church has a single nave with a wooden roof and a square apse, which is circular on the inside; above the apse, a Gothic bifora window.

Its transitional style is well summarized by the rich decorations: a sequence of pilasters divides the façade into three vertical units, topped by Lombard bands. These, combined with the moulded portal and the rose window, differentiate the central unit of the façade. The church is completed by a bell-gable, whilst northwards there is a secondary portal.

Its façade is very simple and is topped by a bell-gable. The church is composed by three naves, a feature which is unusual for the churches of this area. The considerable differences that can be detected in the internal arches and in the walls suggest different construction stages. Internal and external walls show the reuse of earlier stonework.

Given its ancient origin and the lack of qualifying decorative features, dating is difficult to interpret. The main façade with a double-inflection end and central oculus recalls the parish church dedicated to the Assumption of Mary and the church of St. Anthony. The walls were realized with a mixed technique, including a variety of different stones.

Following the standard feudal residences, Palazzo Orrù di San Raimondo represents the main body of a structured architectural and urban complex, including the agricultural and judicial court, the prison tower, the family chapel and the fortifications. In the early 20^th century the original structure of the building was still partially legible.

Originally, the history of this building was connected to the facing church of St. Anthony, which was probably the private chapel of the Orrù family.

In 1814, the brick masters Efisio Deiana, Giovanni Marcia, Giovanni Antonio Manca and Ignazio Podda renovated the house and built the new façades, marked by a giant order of pilasters. The sober Piedmont’s aristocratic palaces inspired the Ionic windows, enclosed by frames with lateral volutes.

Like the nearby church of St. Anthony, the main façade of this parish church presents a double-inflection end. In the centre of the façade, the portal is topped by a Gothic lunette, to which correspond, in the upper tier, an oculus and a small niche.

On the left, the bell tower; it is similar to the 17^th-century model of the bell towers of Cagliari, used in different architectures of the Campidano plain.

The 17^th/18^th– century wooden furnishings include some fine quality statues, decorated according to the Estofado de oro technique, the retable of the Virgin of Itria and a pipe organ.