During the planning and design phase.  Architects and engineers typically don’t understand the effects their designs will have on thier trees, or what effect that thier trees will have on the long-term well being of thier designs. So, it is important to consult an Arborist before construction begins to ensure that the trees and structures are well suited to co-exist.   Consulting an arborist first can also prevent major tree damage that could result from the construction process itself.