This paper provides architects and educational planners with data on the necessary space requirements for restrooms, mechanical rooms, custodial spaces, food service, construction enclosure space, and circulation and corridor space, as well as an ongoing indication of necessary building area per student. It offers itemized data to illustrate variations and similarities in elementary schools, junior high/middle schools, K-12 schools, and high schools. Data were extracted from the final construction drawings of 158 educational facilities designed and constructed over the last 12 years. The paper presents general facility data and itemization of facility research data. Results show that programming percentages for the various categories can vary dramatically, depending on building systems utilized, type of building enclosure, and efficiency of the design. Based on the facilities examined, 32-38 percent should be added to net programmed areas for construction and circulation, depending on the type of building being developed. Net programmed areas should include the necessary restroom, custodial, mechanical/electrical, and food service requirements. (SM)