The existing church of St Martin in Hecho was rebuilt between 1829 and 1833, after the damage sustained during the War of Independence. The original 17th-century church was itself built on an earlier Romanesque temple. The robust and solid structure of the church is divided into three naves. The central nave is broader and taller than the lateral naves and is prolonged at the western end, where the choir gallery is located. The bell tower is attached to the south side.

On the inside, the church is understated in its decoration. The War of Independence also resulted in the destruction of the old altarpieces which were replaced by others from the nearby Monastery of the Mercedariaos del Pilar in Javierregay. These were pieces dating from the first half of the 18th century. The main altarpiece has been recently extended in height. The other two altarpieces, which are in the transept, are dedicated to St Martin and The Virgin of Grace and are excellent examples of relief carvings.

Another two pieces from the monastery in Javierregay were used to decorate the lateral naves. These are simpler in design and consist of a canvas flanked by wings with leaf motifs. They are dedicated to St Raimundo de Peñafort and St Pedro Nolasco.

Finally, the baptismal font situated at the western end of the southern nave, deserves a special mention. It is a varied Classicist piece influenced by the Pilar chapel in Zaragoza. It is hemispherical and decorated with a medallion that bears a relief sculpture of the baptism of Christ.