There are several cells small and large inside the wall of the serai which were used for ordinary and the state guests or officials respectively. There were also separate cells or rooms from the Muslim and non-Muslims who were served by attendants of their respective faith. The living quarter or cells now have either been razed or turned in to cattle pen. In the winters, cattle are kept in these cells. The cells indicate the aesthetics of the builders as one finds beautiful horizontal panels on both alcoves and the interior cells which were ostensibly created for embellishments.
There also lies a mosque in the centre of the Serai. Recently, it has been repaired by the locals. Some extensions were also made before the original three arch entrances. It is three-domed structure. The squatting domes and four corner kiosks add beauty to the structure. The mosque is similar to one located in Kuri town which is believed to have been built by Akbar. It has also similar squatting and corner kiosks as seen on Serai Kharbuza mosque. The mosque still survives some frescoes on the domed ceiling and mihrab. Likewise, cut brick ornamentation on the cells is also splendid.
This serai is prototype of the Suri period Serias. In the Mughal period caravan serais are found all ancillary facilities like bazaars, baolis, mosques, and living quarters As one travels on the G-T road from Attock to Lahore, one comes across many caravan serais built by the Mughals. Prominent among them are Begum Ki Serai in Attock, Serai Hasanabdal, serai Kala at Taxila, Serai Kharbuza in Islamabad, Rawat Serai (also called fort), Sultan Serai near Rohtas fort etc.
The authorities concerned should protect Serai Kharbuza which once dominated the Mughal highway. It can be the best tourist site as tourists visiting the capital city only rush to see the Buddhist monuments of Taxila.