This work aim to contribute to making constructions sites in Sweden safer. The purpose is achieved by focusing on the preventing work that is made during the planning phase. Therefore this work will result in recommendations on how  to better prevent work environment hazards and which risks are the hardest to identify. During the planning phase a work environment document is required to be established. These documents and the belonging risk analysis is the core of this work. The problem is identified thru qualitative interviews with four informants. All of the four informants shared the opinion about knowledge being inadequate in the planning stage. This is revealed in the work environment plan that often is copied from another project instead of being adapted for every unique project. To achieve a proper work environment plan a wide range of knowledge is required. This makes it hard for one person to carry out this work while also leading the projection since vast experience in work environment is needed. The result makes the foundation for the presented solutions. The solutions are that the project leader and BAS-P should be two different persons and that the handover from BAS-P to BAS-U should be carried out thru a physical meeting between the two of them. By dividing the projection leader and BAS-P in to two different people it allows BAS-P to solemnly focus on the work environment issues while the projection leader can focus on propelling the project forward.