Below are two sets of before-and-after photos. The top pair shows how trees can be saved when a house is torn down to build a new one. The second set shows how the addition of a front porch did not disturb the front tree. All too often, however, this is not what happens. See below for an example of what is done more often.
And now for something completely different. The photo on the left below is from Google images showing a property in 2012. The photo on the right is the same property, lot cleared for new house in 2015.