If you are preparing to build on a wooded lot and the health of the trees on the lot is important to you, the best thing you can do is to retain the services of an arborist to assess the site while you are still in the planning stages of your construction project. An arborist can help you identify the trees that you want to save, and formulate a plan to protect those trees from injury and soil compaction, so you can accomplish the goal of saving them and maintaining their health.