An earlier church dedicated to San Salvatore existed in Valdottavo since as far back as the VIII century, while the existing church, dedicated to S. Pietro, is said to have belonged to the parish church of Diecimo since the XIII century. The church of S. Pietro is located in a dominant position above the hamlet of Valdottavo; it is mostly made of white limestone with the exception of its northern side facing the hill—which is of grey limestone. The decorative elements of the church are concentrated around the apse and can be particularly appreciated in the mouldings and around the mullioned window frames.
The edges of the main portal and the mullioned window on the façade are sculpted with floral elements. The church of San Pietro di Valdottavo was built in a dominant position above the village. This impressive construction is an interesting example of the use of urban building techniques in a rural context: in particular, one will note strong analogies with the church of S. Alessandro Maggiore in Lucca. This factor suggests that during the XII century A.D. there were masons working in towns as well as in the surrounding countryside.
The building presents a Latin-cross plan with three aisles and a semicircular apse. The interior is illuminated by two series of mullioned windows located along the aisles. In Modern times, the church was renovated and adapted to meet the demands of the new liturgy and to fit the Baroque taste. Therefore, a transept was added on the north side, divided into small aisles by two pillars and large windows replaced the earlier mullioned window. A new rectangular apse which was as high as the nave was added later. Inside the church, visitors will appreciate an exceptional row of sculpted capitals.