Property Damage Caused By Birds Nesting

Birds are a normal part of the environment around any property, but when they choose to nest inside a building instead of near it, the results are rarely harmless. Nesting materials packed into gutters and vents block water flow, and droppings left to sit are acidic enough to eat into roofing, siding, and metal over time. What starts as a couple of birds on a ledge can turn into a structural repair bill if it goes unaddressed.

Birds & Geese Beware, Inc. has treated nesting-related damage on commercial, municipal, and residential properties across New Jersey, New York, and Connecticut since 1991. This guide covers where birds typically nest, what kind of damage to expect, and how we deter and repair it.

Nesting materials packed into gutters and vents block the water flow those systems are built to handle, and standing water that backs up under roofing can lead to rot and mold inside the structure. Add in the weight of pooled water on a blocked flat roof, and the risk moves from cosmetic to structural. Droppings compound the problem, since their acidity degrades concrete, corrodes metal, and weakens roofing material with prolonged exposure. Blocked chimneys carry their own separate risk, since a nest inside a flue can trap carbon monoxide that would otherwise vent safely outside.

Dried droppings can become airborne and carry bacteria that lead to respiratory illness, and nests often harbor mites, fleas, lice, and ticks that spread into the surrounding living space once the birds move on. Ventilation systems blocked by nesting material carry an added risk, since a blocked chimney or vent can trap dangerous gas buildup inside a structure. These are the reasons we always recommend professional assessment before anyone attempts to clear a nest on their own.