A large cost at the construction sites today is the labour cost of the workers. But unfortunately the worker potential is not used to full. It is not unusual to take into a count with a work-­‐place-­‐additional-­‐time of 50% in some cases. By increasing the workers' motivation and responsibility for their tasks may reduce the time considerably, which also increases the potential for greater gains in construction projects. By using the situational leadership may the workers level of maturity develop entirely. They become broadly self-­‐propelled with high efficiency and the construction leader can after that get more time for his/hers own tasks. The work gets done more efficiently and the potential for greater profits increase. Good leadership at the construction site also improves the working environment for all. More people may be motivated to go to work and such sickness absence may decline.