In practice, there are often discrepancies between the physical construction of the building and the building permit documents provided by Dinas Penataan Ruang dan Pertanahan Kota Palu. These discrepancies can include various aspects, such as building design, structural design, layout, or unauthorized design changes. These non-conformities can also occur caused by various factors, such as insufficiently skilled resources, lack of communication between construction teams, unauthorized design changes, and lack of supervision. The aim of this research is to determine the factors that influence construction non-conformance with Building Approval documents (PBG) and the factors that most influence construction non-conformance with Building Approval documents (PBG) In this research, the sampling technique used was probability sampling with the number of respondents as many as 114 using the Slovin formula, and the application for a building construction permit was submitted to Dinas Penataan Ruang dan Pertanahan Kota Palu from January 2022 to June 2023. A total of 114 respondents were surveyed. Data collection uses observation techniques and distributing questionnaires. Data analysis using Factor Analysis. Based on research findings, there are seven factors that influence deviations from building permits (PBG) documents namely 1). Regulation and Supervision; 2) Resources; 3) Design; 4). Management; ; 5). Technical; 6). Sanctions and 7). Implementation. The size of the influence of all these factors reached 61.955%, The remaining 38.045% is influenced by other factors whose influence is less significant.