Mescid-i Haram is the oldest masjid ever known (Âl-i İmrân 3/96). Its area reached to 4482 m2 upon the expansion it had gone through during Prophet Osman and it was recorded that the first portico was constructed in this period. Mescid-i Haram on which various additions were realized within centuries was granted its exact shape in terms of architecture with the project drawn by Architect Sinan and during the periods of II. Selim and III. Murad.
Numerous conical domes replaced the old flat wooden roof of Harem-i Şerif prepared in compliance with the classical Ottoman architectural style in Hegira Era of 984 (1576). While protecting the characteristic of the courtyard as an open place, gilt domes with small diameters with several porticos were used in the second internal courtyard. I. Calligraphy plates of the porticos and ornaments were realized during the periods of I. Mahmud and I. Abdulhamit.
Interdisciplinary methods which are in compliance with the projects drawn upon the analysis and scientific researches have been used within the scope of the restoration works started in 2012. Basis and caps of the original marble pillars were documented as inventory and removed and taken under protection within the restoration works where traditional and modern methods were used. Concrete reinforced parts added afterwards on the removed parts were separated. Restoration works where the original elements removed were brought together are still under progress.