The Eyup Sultan Mosque has significantly different features compared to the design of the first mosque built. You can enter the outer courtyard in the south of the complex from Eyup Square, which is quite large. This outer courtyard has a triangular structure. There is a fountain in the middle of the courtyard. The mahfil bridge over the courtyard is an eye-catching architectural element. To get to the inner courtyard, you proceed through the outer courtyard.
This historical mosque has a rectangular plan and a prominent mihrab. It was rebuilt under the influence of Sinan the Architect and remained faithful to classical Ottoman architecture. Semi-domes surround its central dome and attract attention with its octagonal baldaquin design. Traces of the Ottoman Baroque style can be seen in the decoration of the building; Column headings are in the Ionic style. The decorations on the entrance doors, mihrab, and pulpit stand out. The structure generally uses white stone and marble, with brass plating and gold leaf details in some places. The mosque has two minarets; It was repaired over time, and tall minarets were added in 1733. The minaret on the Golden Horn side was rebuilt after a lightning strike in 1823.
A large, irregular courtyard in the outer courtyard of Eyup Sultan Mosque opens to the inner courtyard. To the south of the outer courtyard is a high corridor, formerly used as the sultan's private entrance, now providing access to the mosque and containing a fountain. The inner courtyard offers access to the mosque and the tomb of Ebu Eyyub el-Ensari. A rectangular platform is in the courtyard's center, and an old plane tree is decorated with Baroque-style marble fountains at the corners. There are pilgrimage fountains between the railings at the corners of the platform.
At the tomb's entrance is a portico decorated with arches and domes. There is an entrance extending into the inner courtyard. Inside is a traditional octagonal burial chamber covered with a dome. The sarcophagus inside the tomb is decorated with silver-framed calligraphy and decorations in the Baroque style. The wall on the portico side of the tomb is covered with Iznik tiles from different periods, brought together when the mosque was rebuilt in 1798-1799. The entrance hall's walls are also decorated with Iznik tiles, most dating from around 1580 and containing red glaze, known as Armenian boles.