This article is on the development of the School Facility I.Q. Inventory (SFIQI), an instrument to assess the extent of knowledge a school administrator possesses in delivering their assignment to manage his/her school building. The instrument was designed based on the current literature. The validity of the instrument was verified by a panel of judges and its reliability was tested by using split-half reliability method. Embedding eight themes on school facility management, SFIQI consists of five sections with a total of 71 quantitative questions. The instrument can be used for self assessment of a school administrator's knowledge about school facilities. It can also be used as a teaching tool in the school leadership preparation programs.