Auditing the timetable for projects for the restoration and maintenance of archaeological buildings is one of the fundamentals for project management success, but sometimes circumstances arise during implementation that prevents adherence to the timetable. This is reflected in the project's implementation period and total cost, which has a negative impact on the state budget represented in the Supreme Council of Antiquities, as well as the council's targeted restoration plan, and the project's total cost, must be settled before the project start, including the implementation time. Perhaps one of the most important reasons for this is the rise of new items, the need for them which is evident during implementation, or the increase in the quantities of some similar items included in the assay. The research is concerned with performing an analysis of some projects for the restoration and maintenance of Islamic archaeological buildings due to their large number and the fact that they are the most intertwined with the urban mass. The study recommends those interested and collaborating in this field to consider the presence of items in the assay that were not considered and have an impact on the implementation time as well as the quantities of the assay items when making timetables for projects to restore and maintain archaeological buildings