If there is no access to the back side of the hole, or if looks are a consideration, use techniques similar to those used when patching drywall. Reshape the hole into a rectangle with the desired dimensions and cut it out using a keyhole or reciprocating saw. Caution: Electrical wiring or plumbing may be under the board. Secure two cleats to the siding inside the opening, one opposite the other, so the plug cannot slip through. Cut the plug from a piece of siding that matches the grain, texture, and thickness of the siding, oriented so the grain matches the grain around the hole. Cut the plug to the same dimensions as the hole, allowing for the saw kerf on each side. Secure the plug to the cleats, caulk any gaps around the edges, and finish the repair to match the existing siding.

Another approach would be to saw two opposite sides of the opening on a bevel when reshaping the hole. The plug would be cut to match the bevel. These bevels would provide the surface the plug would be secured to. Fill small, cone-shaped holes with caulk. Texture and finish the repair to match the existing siding.

If damage is extensive, the siding may have to be replaced or covered with a more durable product such as siding made from steel, aluminum, or plastic. These materials are generally more resistant to damage. If new construction is planned near an area with woodpecker problems, one of these materials should be considered, rather than rough-sawed plywood or other wooden siding.

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