The church is known for its Italian Renaissance design.
It also has an unusual two-storey façade, supported by two pairs of columns on each side of the arched entrance.
The top of the façade holds a recessed niche that showcases the image of the city's patron saint, San Guillermo el Ermitaño.
It has windows made from capiz with wrought iron screens.

It has a main retablo and two smaller ones on its sides.
The lower level of the huge retablo contains the image of Saint William, the parish's patron saint.
The church is known for its Italian Renaissance design. It also has an unusual two-storey façade, supported by two pairs of columns on each side of the arched entrance. The top of the façade holds a recessed niche that showcases the image of the city's patron saint, San Guillermo el Ermitaño. It has windows made from capiz with wrought iron screens.
It has a main retablo and two smaller ones on its sides. The lower level of the huge retablo contains the image of Saint William, the parish's patron saint.
Laoag Cathedral