DKI Jakarta, as the capital of the Republic of Indonesia, has the highest population density in Indonesia, with a population of 16,334 people/km2. Therefore, community facilities and infrastructure within the DKI Jakarta Provincial Government play an important role so that community service can be carried out properly. As one of the main infrastructures, State Buildings must have building reliability as stated in the technical requirements stipulated in Presidential Regulation Number 73 of 2016. Building maintenance is an activity to maintain the building's reliability and infrastructure, and facilities so that the building always functions properly. Based on a survey conducted by the DKI Jakarta Provincial Office for The Creation of Works, Spatial Planning and Land Use in 2019, the building assets of Province DKI Jakarta are 9823. 60% of those buildings were classified as Simple-Building category. Due to numerous building assets, building maintenance activities need to be supported by an adequate maintenance guideline especially for the simple-classification building. This study aims to develop preventive maintenance guidelines based on Work Breakdown Structure. The Work Breakdown Structure (WBS) will be used as the basis for maintenance guidelines, including maintenance activities and frequency. The methodology used in this research is study literature, survey and expert validation for WBS for Simple-Building component and Preventive Maintenance Guidelines.