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Birds look out for their natural predators and avoid nesting in places that seem to be a threat. Place a few plastic owls, snakes, or foxes near any areas that you want to keep nest-free. When a bird sees the plastic animals, it will find somewhere else to nest. Tie 2 white balloons together and paint a black circle in the center of each one. This simple scarecrow can resemble the eyes of predators and trick birds into thinking the area is unsafe. Recorded sounds of predatory animals or birds in distress can make any nearby birds think that the area is unsafe for hatchlings. Set up speakers in your backyard and play recordings during the day to deter birds from nesting.  If you would prefer not to play predatory animal recordings, wind chimes can also repel birds.  Let your neighbors know about your plans before setting up any noise recordings. Placing strips of flash tape around buildings, plants, or items where you don't want birds to nest can confuse birds and prevent them from landing nearby. If you don't have any flash tape, tying a shiny object like an old CD or piece of silverware can create a similar effect.  Mirrors work as an effective alternative to flash tape.  Aluminum pie plates also work as an alternative, and they can make a loud noise when they clang in the wind.

Summary:
Put up plastic predators near the areas where you don't want birds to roost. Create makeshift predator scarecrows out of balloons. Set up noise recordings of bird predators to frighten birds. Hang strips of flash tape or another shiny object.