Pigeons often prefer to use the interior portions of buildings to nest and roost if an opportunity for access is provided. Openings to lofts, steeples, vents, and eaves can be blocked with 1/2-inch galvanized wire mesh, wood, sheet metal, or other solid construction materials to prevent pigeons from entering.
Controlling pigeons on the exterior surfaces of buildings often requires considerably more effort. The most effective and permanent methods of control involve structural modifications which either physically exclude pigeons from the preferred surface or make it difficult for the birds to rest comfortably on the exposed building surfaces. Physical exclusion can be accomplished by installing weather resistant netting, wire screening, sheet metal, or other materials in a manner that will restrict access to the roosting sites. A grid of heavy gauge monofilament line spaced at six-inch intervals may also be used to create a fence that will interfere with the birds' normal flight pattern to the roosting area.