Trying to drive woodpeckers away involves using visual repellents and loud noises. Attempting to scare them off requires immediate action because woodpeckers are persistent once a territory or pecking site is established.
Prompt repair of holes may encourage the woodpecker to leave, or discourage other woodpeckers, as these holes may serve as visual attractants. Cover holes with aluminum flashing, tin can tops or metal sheathing and paint them to match the siding.
If damage occurs near areas that provide perch sites, discourage use of the perch with metal flashing or other materials. If a single board on the house serves as a foothold, tightly stretch wire or heavy monofilament fishing line approximately two inches in front of the board to prevent the bird from landing.
According to Predmore, hawk silhouette mobiles are successful frightening devices. Construct hawk mobiles with a wingspan of about 22 inches and a length of 11 inches. The best materials are cardboard, Styrofoam or light plywood. Paint them black, or another dark color. Hang two hawk mobiles from the eaves on either side of the damaged area.
Other methods include hanging black plastic strips 1 to 1 1/2 inches wide and 2 to 3 feet long, pinwheels with reflective vanes, or aluminum pie tins near the damaged area. Allow the wind to blow the strips, pinwheels and pie tins freely.
Some research suggests that mirrors frighten woodpeckers. Predmore recommends fastening them flat against the wall next to the damaged area. The theory is the woodpecker will see his own image and think it is another bird's territory. Owl images, on the other hand, are generally unsuccessful for frightening woodpeckers. Where woodpeckers are persistent, use two or more of the visual frightening devices simultaneously.
Because some birds drum to produce noise to attract mates, deadening the sound-producing area by filling the hollow space behind the wood sometimes works to discourage them. In other cases, woodpeckers are frightened away with persistent loud noises such as banging pots and pans together, firing toy cap guns or yelling.
Woodpeckers occasionally drill on houses to obtain insects in the wood. Since insects seldom infest well-seasoned wood in Colorado, woodpeckers hammer holes to obtain insects primarily during the first two years after house construction. Insecticides or wood preservatives may deter woodpeckers by killing the insects.
All North American woodpeckers are primarily cavity nesters that excavate their own cavities, but some species occasionally use existing cavities or nest boxes. Placing cavity-type nest boxes on buildings in the vicinity of northern flicker damage has shown some success. Nest boxes are worth trying where other methods have failed. Once established, nesting woodpeckers defend their territories and keep other woodpeckers away. (Read a personal account of success using this approach.)
Construct nest boxes from wood with a 2 1/2-inch-diameter entrance hole 16 to 20 inches above the floor. Inside dimensions should be about 6x6, and the total height should be 22 to 26 inches. Pack the box with sawdust. Supposedly, by removing the sawdust, the bird is fooled into constructing its own nest. A front-sloping, hinged roof will shed rain and provide easy access for re-filling next year.
Woodpeckers are classified as migratory, nongame birds and are protected by the Federal Migratory Bird Treaty Act. A federal permit is required before any lethal control methods can be employed. Penalties and fines are assessed to violators.
In addition to the federal permit, citizens must inform the local Colorado Parks and Wildlife officer when, where, and the type of lethal control that will be used. Homeowners must also observe all county and city ordinances.