[5] For the mosque's construction materials such as marble and stones were taken from the ruins of a three-aisled basilica that was located in the port, as well as from the Baptistry of Saint John called 'the Seven Steps.

Gazi Hasan Pasha is mainly built with ashlars of various shades and colours, as well as marble and reused ancient building material.

It has two entrances leading to it, one on the north side via an external marble staircase with a two-pitched tiled canopy, which has a pediment that is supported by two thin columns.

Both made of white marble, they are a bit elevated compared to the rest of the hall and elaborately decorated with geometric and floral motifs.

[1] The mosque is accompanied by a fourteen-sided fountain that stands to the north of the main building, made of white marble and ancient materials, and covered with a dome that is supported by seven arches and columns.

[1] In modern times, the mosque stands in a relatively good condition, although it is still in need of some renovation,[5] as it shows natural wear and the wooden materials had corroded, as have some of the sturdier, stone structures, like the ones that used porolite.