The cathedral is built like a fortress.

From the outside, the cathedral resembles a fortress, designed to provide security in the event of ongoing warfare in the city. Construction began after King Alfonso IX conquered Badajoz in the 13th century. The building features battlements at the top and a tall quadrangular tower with large windows on the second level. There are three entrance doors, with the main one being the Gate of Saint John the Baptist, which is topped with an image of the saint. Inside, the cathedral follows a traditional layout, including three naves, five bays, a transept, and a chancel with three apses. The ceiling features decadent Gothic vaulting.