In 2007, the mosque underwent a fourth extension project which is estimated to last until 2020. King Abdullah Ibn Abdulaziz planned to increase the mosque’s capacity to 2 million; although the King died in 2015, his successor, King Salman, is likely to continue renovations. In 2016 it was estimated that Great Mosque had cost 100 billion dollars
Northern expansion of the mosque began in August 2011 and was expected to be completed in one and a half years. The area of the mosque will be expanded from the current 356,000 m2 (3,830,000 sq ft) to 400,000 m2 (4,300,000 sq ft). A new gate named after King Abdullah will be built together with two new minarets, bringing their total to eleven. The cost of the project is $10.6 billion and after completion the mosque will house over 2.5 million worshipers. The Mataaf (the circumambulation areas around the Kaaba) will also see expansion and all closed spaces will be air conditioned. The King Abdullah Expansion Project will cover an area of 456,000 sq. meters will accommodate an additional 1.2 million faithful. Courtyards of the mosque’s new expansion can hold more than 250,000 worshipers. The project is being implemented by the Saudi Binladin Group.