I am preparing a preliminary study for a hospital that we are aiming at certifying LEED v4.1 Gold. I have been given the task to predict the variation in terms of cost of the implementation of the certification. In particular they asked me about the increase in construction cost and the variation in O&M cost. For the operating cost, I can use the prediction we did for the Optimize Energy Cost credit. The variation in operating cost should be negligible compared to the other two voices, in my opinion. However, I do not know how to estimate the increase in the construction cost. Do you have any suggestion or article where I can find some input about it?
Thank you very much.