The Mosque of Shaikh M. R. Bawa Muhaiyaddeen is located at the rear of the Bawa Muhaiyaddeen Fellowship house. It was inaugurated on May 27, 1984, after beginning construction in December 1983, and was the first purpose-built mosque in Pennsylvania. It is trapezoidal in plan, with two levels, and a large stained glass dome above the prayer hall. Originally there were a series of 5 small green domes along the front roofline of the mosque, but at some point in the 2010s those domes were removed. The mosque is faced in marble, with three panels on the front facade each inscribed in gold leaf Arabic calligraphy with verses of the Quran, the names of God, and the major prophets in the Islamic tradition.
The ground level entrance leads to a classroom and wudu (ablution) areas for men and women, and stairs to the prayer hall on the second floor. The women's section is separated by a lace curtain, with the dome above it. A border around the upper edge of the room has Quranic verses written in Arabic calligraphy. 48 windows are set into the octagonal drum of the dome, inscribed with the 99 names of God on their panes. A marble mihrab and wooden minbar are along the qibla wall.