This research aims to study the factors that affect the safety of the condominium project. Because safety is very important in the current construction project. The research focuses on the study of construction workers. The research tool is a questionnaire with three parts: Overview of all respondents. The understanding of safety in construction work and cognitive tests on safety in construction. Then came the relevant factors to determine the factors that affect the safety of the construction
of the research showed. Factor for the behavior of the workers about the safety of construction. At the risk of unsafe behavior in construction work descending four first is the behavior of the workers about the safety of personal protection equipment. Behavior on work involving flammable. Behavior about working on disposing of leftover. And behavior of materials handling. For a better understanding of the workers about the safety of construction. Factors affecting safety in the construction of most second factor is the safety of moving materials. Safety devices protect the personal safety.