Squirrel Species in Alaska: Red squirrels vs. Flying squirrels
Alaska is home to two primary species that invade homes: the red squirrel (Tamiasciurus hudsonicus) and the northern flying squirrel (Glaucomys sabrinus). Red squirrels are diurnal, aggressive, and often cause the most visible damage. They are common in coniferous forests and urban areas with spruce trees. Northern flying squirrels are nocturnal and gliding, allowing them to access roofs via trees. They are more common in Southeast Alaska and interior forests. Both species breed twice a year, with peak entry periods in March–April and August–September. Understanding which species you're dealing with helps tailor exclusion: flying squirrels may require different mesh sizes or entry-point detection methods.
Why Alaska's Climate Drives Squirrel Invasions
Alaska's long, cold winters force squirrels to seek warm, insulated spaces for nesting. Attics provide shelter from predators and weather. During fall, squirrels actively prepare for winter by storing food and finding secure dens. Homes with unsealed eaves, vents, or gaps are prime targets. In spring, breeding season drives pregnant females to safe attics for birthing. The freeze-thaw cycle also creates new gaps as wood expands and contracts. This makes inspection and maintenance critical in late summer before snow falls, and again in early spring after thaw.
Health and Fire Risks: What You Need to Know
Squirrel droppings and urine can contain leptospirosis, salmonella, and hantavirus. Hantavirus is rare but can be fatal; it's transmitted through inhalation of dried droppings. The CDC reports that hantavirus pulmonary syndrome has a 38% fatality rate. When cleaning droppings, always wear a respirator and gloves. Fire risk is equally serious: the National Fire Protection Association estimates rodents cause 20,000 house fires annually in the U.S. Chewed wires can short-circuit and ignite insulation. Professionals use fire-resistant sealants and inspect wiring during exclusion.
The Exclusion Process: Step by Step
Professional exclusion starts with a thorough inspection of the attic, roof, and exterior for entry points. Technicians look for gaps around pipes, vents, soffits, and chimneys. They install one-way exclusion doors at main entry points, then seal all other gaps with heavy-duty materials: 1/4-inch hardware cloth, steel wool, and expandable foam. After 3–5 days, the doors are removed and the final hole is sealed. Damaged insulation is replaced, and droppings are cleaned with HEPA vacuuming and disinfectants. A warranty often covers future re-entry for 1–5 years.
What surveys and cost guides say about squirrel problems
The statements below are tied to named surveys, studies and published cost guides, and each one says what it does and does not prove. They describe patterns across many households, which is useful context, not a diagnosis of any one property. A homeowner at war with squirrels is in a small camp: 9.3% of metro-area residents reporting squirrels or chipmunks nearby wanted far fewer, in Puri and colleagues' 2022 survey (1,006 respondents, published 2024), which measured neighborhood attitudes rather than infested homes. In Puri and colleagues' 2022 survey of 1,006 residents of one southeastern U.S. metro area, published in 2024, 8.4% of respondents with squirrels or chipmunks nearby (the survey combined them) preferred a small increase, a preference figure rather than a household infestation rate. Property managers can expect only modest appetite for squirrel reduction: 15.2% of metro-area residents reporting squirrels or chipmunks nearby wanted somewhat fewer, according to Puri and colleagues' 2022 survey (published 2024) of neighborhood attitudes, not of squirrels inside buildings. a squirrel trapped between floors is the costliest scenario: Fixr's January 2025 U.S. publisher estimate of $750 to $1,500 for ceiling removal is an estimate rather than a measured bill, and drywall repair typically comes on top. For a property manager, the sobering number is that pests can end a tenancy: 7% of respondents in ConsumerAffairs' February 2024 survey of 2,000 U.S. respondents reported permanently leaving a home over pests, a self-reported finding from a mixed pest-and-mold survey, not an infestation rate. Use these numbers as context, not as a diagnosis. A provider's written inspection findings should drive the treatment plan, and any quote should spell out how many visits, which areas and what follow-up it covers.