This research aims to define the Engineer Standard of Care in Green Buildings as it is an emerging issue. Standard of care shall define Engineer's liability in case of green building dispute. Thus, it discusses the traditional standard of care, the green slandered of care, the modification by expansion or limitation of such standard. This is in light of the Jordanian bylaws. It concludes that the nature of green building requires special standard of care and the engineer must be aware of all conditions that may expand or limit his liability.