The Mudejar tower is the only remaining vestige of the old church. The primitive 14th century temple, of which we have hardly any information, was replaced in the 17th century by the new Baroque construction. Nowadays, its appearance is distorted with respect to how it was originally, since, with the reconstruction of the temple in the 17th century, the tower was enlarged with a last body. In addition, what is probably the altar table of the original church has recently been found in the area surrounding the church, and can now be seen in the entrance atrium.

We have, therefore, an example of the rich Mudejar heritage that Aragon boasts, proof of which is that this tower has been protected since 2002 by virtue of the Order of 12 July, by which the Department of Culture and Tourism of the Government of Aragon declares the “Bell Tower of the Church of San Miguel Arcángel” in Villarreal de Huerva a Catalogued Asset of Aragonese Cultural Heritage. Among the different types of towers found in Mudejar architecture, the one in Villarreal belongs to those that have Islamic decoration, but do not have an Islamic structure, i.e. a minaret structure. These towers correspond to the layout of the stately towers of castles. In these towers, which have vaulted brick rooms inside, which also make them difficult to destroy, the ascent is much more complicated than in the minaret towers, where the floors were made of wood. These characteristics can easily be associated with the defensive nature of these towers, which in the case of Villarreal is evident, since, as we have mentioned, the church was part of a walled enclosure with a military function. Traditionally, the tower at Villarreal has gone largely unnoticed in the historiography of Mudéjar art. The sparse decoration and austerity of the tower itself, and the body with which it was rebuilt following the reconstruction of the church in the 17th century, have contributed to this neglect. Likewise, the large volume of the new Baroque church also helped to overshadow the tower.

The tower, made entirely of brick, is located at the foot of the church, on the south side or Epistle side, has a square floor plan and is divided into superimposed rooms, with the exception of the first body, which is solid. Above this initial level there is a first room which is accessed from the choir of the church, about six metres high, covered with ribbed vaulting. This body has smooth walls on the outside, which are only altered by the presence of three narrow arpilleras.

Next, we find a second room that is covered with a vaulted ceiling, which is accessed by a narrow intramural L-shaped staircase with a steep slope and high and uncomfortable steps, embedded in the east wall forming a small box covered with brick vaults formed by the approximation of courses. In this second room there are two windows more than a metre apart on each side, with the exception of the north side, where the staircase enters, which only has one. This would have been the original bell tower, hence the presence of the openings and the concentration of decoration on the outside.