The project of the Custodian of the Two Holy Mosques for the expansion of the Grand Mosque and works of the development in the holy sites is considered as the pearl of magnificent works accorded great attention by the Kingdom of Saudi Arabia for serving Muslims, due to the wise leadership's belief that the State has been honored to hold this responsibility and it has already held it and was still holding it since the reign of the founder, late King Abdulaziz Al Saud.
The new expansion of the Grand Mosque is the largest of its kind in its history, at an estimated area of (400,000) square meters and a depth of (380) meters with a capacity of more than one million and two hundred thousand worshipers, at an estimated financial value of more than (40) billion Saudi riyals.