The Parish Church of San Juan Bautista is located on a small hill in the town centre of Lezo.
For many years, the Parish Church of San Juan Bautista was shared between the municipalities of Pasai Donibane and Lezo. When the inhabitants of Pasaia were given permission to form another parish, in the mid-16th century, they built their own church, but they lacked funds and work did not begin until the beginning of the 17th century.
The work on the church began on the north side. Two chapels open onto this side, and their arches are slightly pointed. According to the deed of agreement, the south side also has two chapels. One of them is closed by a semicircular arch and is used to enter the church. We cannot say that the door was built according to the proposed model – that of the church in Usurbil – as it no longer exists. The one in Lezo is a “small chapel” and is reduced by a simple ribbed vault.
The church is spacious and has a single nave. On the outside it has large lintels, while on the inside it has prismatic pilasters and a triangular base. They are formed by joining the brackets that support the different grooves of the vault. It is covered by a 16th-century transept. The grooves are wavy, while the bases are curved. Some of the transepts have special decorations. This is the only case we can find in Gipuzkoa.
The church has four bays: the presbytery rises above the first. There is a beautiful staircase to reach it. The main altarpiece is four stories high and is crowned by a calvary.
On the outside, the building has Gothic features in the gargoyles and the west doorway. Above the more modern door, the starting points of the oldest pointed arch can be seen. Above the doorway opens a huge Gothic window. To distribute its light, there is tracery and two mullions. Above the window, on the south side, a molding can be seen on the double-inflected arch. It ends with a lancet. There is neither tracery nor mullion. The molding is made up of decorative balls on one side of the southern facade.
The external wall breastworks are very prominent in the apse and give the church the appearance of a fortress.
