The Hidden Dangers of Squirrels Nesting in Your Home

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 Disease Risks

Wild squirrels can carry bacteria and pathogens that may become problematic when they establish nesting areas near or inside a home. Two of the more commonly associated illnesses are salmonella and leptospirosis, both of which have the potential to cause serious health issues in humans.

People do not need to touch a squirrel to be exposed to these health risks. As squirrels occupy attics, wall voids, and other hidden spaces, their urine and droppings gradually accumulate. Over time, this waste can contaminate insulation, wooden framing, stored belongings, and other materials throughout the structure.

When infestations grow over time, dried waste particles can become airborne and circulate through portions of the home. This is particularly concerning for individuals with asthma, allergies, respiratory conditions, weakened immune systems, or other sensitivities.

As squirrel activity continues, contamination will become more widespread and cleanup costs often increase significantly.

 Parasites

Squirrels are often accompanied by unwanted hitchhikers. Fleas, ticks, and mites commonly live on squirrels and may remain behind after the animals have left or been removed. These parasites can then seek out new hosts, including family members and household pets. In addition to causing irritation and bites, certain parasites can spread diseases. 

Fleas are known carriers of illnesses such as tularemia and, in rare circumstances, plague. Although plague is uncommon today, documented cases linked to squirrel exposure have occurred as recently as 2017 in Colorado.

Ticks pose another important concern. Many homeowners in Birmingham, AL understand the dangers associated with Lyme disease, but not as many realize that squirrels can introduce ticks directly onto their property. A squirrel family nesting in an attic or traveling through a home may bring dozens of ticks with them, dramatically increasing your risk of exposure.

 Frequent chewing and structural damage.

One of the primary reasons squirrels are so destructive indoors is their constant need to chew. Since their teeth grow continuously throughout their lives, squirrels must gnaw on hard surfaces to keep them worn down. Unfortunately, homes provide a variety of materials for them to target.

Squirrels frequently:

• Chew through roof decking, fascia boards, window frames, and door jambs.
• Turn small openings into much larger entry holes.
• Damage PVC piping, ductwork, and other building components.

Damage to attic insulation. 

Attic insulation helps regulate indoor temperatures and improve energy efficiency, but squirrels view it as an ideal place to nest. Once inside an attic, they often burrow through insulation, tear it apart for nesting material, compress it, and contaminate it with droppings and urine.

As insulation becomes flattened or damaged, its performance declines. During Birmingham, AL's warm summers and colder winter months, this can force heating and cooling systems to operate longer and work harder, resulting in increased utility costs.

Contaminated insulation presents an additional challenge. In many situations, the affected materials cannot be salvaged through cleaning alone. Instead, damaged sections require professional removal and replacement. This may involve specialized equipment, proper disposal procedures, and installation of new insulation to restore efficiency.

Many homeowners discover squirrel activity only after noticing a spike in their energy bills. Depending on the extent of the damage, insulation restoration projects can cost thousands of dollars.

Electrical wiring is another common target for squirrels. To keep their teeth from becoming overgrown, they often chew through the protective covering surrounding electrical wires and expose the metal conductors beneath.

Sometimes this results in a severed wire that immediately causes power loss to outlets, appliances, or lighting. In other cases, the damage may be less noticeable, allowing the electrical system to continue functioning while concealing a dangerous problem.

When exposed wires come into contact with metal surfaces or nearby wiring, short circuits can occur. Damaged wire insulation may also contribute to overheating. Both situations can substantially increase the risk of an electrical fire.

While homeowners insurance may help cover certain losses, it cannot replace irreplaceable family keepsakes, sentimental belongings, or the consequences associated with a house fire. Homes with a history of squirrel activity should have attic wiring and electrical components inspected for hidden damage.

Food and shelter are the primary reasons squirrels invade residential properties, as many homes offer both. Bird feeders, gardens, unsecured trash containers, and fallen nuts provide dependable food sources. Attics, meanwhile, offer warmth, protection from weather, and secure nesting areas where squirrels can raise their young.

Homes located near mature trees are particularly attractive. Tree limbs that touch or overhang a roof provide direct access to upper portions of the building. Older homes may also contain deteriorated wood, loose siding, gaps around vents, and other openings that squirrels can exploit.

Throughout Birmingham, AL, squirrels generally breed twice annually, once in late winter and again during summer. During these times, pregnant females actively search for protected nesting sites, and attics provide far more security than outdoor nests or hollow trees.

• Running, scratching, or thumping noises coming from the attic or inside walls.
• Visible chew marks around rooflines, soffits, vents, and utility penetrations.
• Missing, loose, or damaged vent covers around your home.
• Small dark droppings that are slightly larger than those left by mice.
• Musty or unpleasant odors, particularly near attic entry points.
• Ceiling stains or discoloration caused by urine accumulation on the floor above.
• Electrical issues such as flickering lights, tripped breakers, or outlets that suddenly stop working.

Keeping squirrels out of your home is usually much less expensive than repairing the damage they can cause. While no prevention strategy can eliminate risk entirely, several steps can make your property far less attractive to squirrels.

Prune tree branches near your property.

Branches that extend over or close to a home provide squirrels with convenient access routes. Keeping limbs trimmed back six to eight feet from the structure can help eliminate the pathways squirrels use to reach the roof.

Check for potential openings regularly. 

Regular exterior inspections can help identify vulnerabilities before squirrels find them. Pay close attention to rooflines, fascia boards, soffits, vents, and other areas where wildlife may gain entry. Even small openings can be large enough for squirrels to squeeze through. Damaged areas should be repaired promptly, and durable metal screening can be installed where ventilation must remain open.

Remove potential food sources. 

Reducing available food sources can make your property less appealing. Cleaning up fallen fruit and nuts, securing garbage containers, storing pet food indoors, and using squirrel-resistant bird feeders can all help discourage activity.

Even with preventive measures in place, squirrels may still find a way inside. When they do, professional wildlife services are often the safest and most effective option.

Squirrels may seem harmless when viewed from a distance, but they can cause serious problems once they establish themselves inside a home. Contaminated insulation, parasite activity, damaged wiring, and structural deterioration are just a few of the issues they can create.

At Conserv Pest & Wildlife Services, our wildlife professionals perform comprehensive inspections, humane squirrel removal services, and exclusion work designed to prevent future invasions. We locate entry points, safely remove squirrels, and secure vulnerable areas to help keep your home protected.

Contact Conserv Pest & Wildlife Services today to schedule an inspection and receive a customized quote for your home.