Each spring we deal with the issue of birds building nest were they are just not wanted. Two things to remember; once birds have laid their eggs, you can’t touch their nest (except European Starlings and House Sparrows) and birds are best discouraged with visual deterents. While not guaranteed, a toy snake draped across or tacked up close to the area where they are trying to build is enough to get them to abandon that nest site. We also have Scare Tape that can be suspended in the area and some have had luck with hanging old CDs from the ceiling. They will find a new place to nest.