The Complete Guide to Squirrel Control in New Jersey

squirrels may look cute in the park, but when they take up residence in your attic, they become destructive pests. Their constant gnawing damages wood, insulation, and electrical wiring, creating both repair bills and fire risks. In New Jersey, the two main species—eastern gray squirrels and southern flying squirrels—are responsible for the majority of home invasions. Understanding their behavior, seasonal patterns, and control options is the first step to reclaiming your home. This guide provides a comprehensive, factual overview of squirrel control tailored to New Jersey homeowners, property managers, and landlords.

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Quick answer

In New Jersey, squirrels like eastern grays and flying squirrels often enter attics through roof gaps and vents. Removal usually means one-way doors or trapping, then sealing entry points. Timing matters: avoid separating mothers from young during breeding seasons. A licensed NJ wildlife pro can help.

Key Takeaways

  • →squirrels enter through gaps as small as 1.5 inches; seal all openings with heavy-duty materials.
  • →Gnawing on wires creates a serious fire hazard—don't ignore scratching sounds in attics.
  • →Professional exclusion (sealing entry points) is more cost-effective than repeated trapping.
  • →New Jersey's varied climate means squirrel activity peaks earlier in the south, later in the north.
  • →inspection terms that vary by provider and service guarantees reduce risk when hiring a pro.
  • →Research: Seven hundred fifty to $1,500 is Fixr's January 2025 U.S. publisher estimate for removing squirrels from inside a ceiling, the most expensive location in its guide; it is an estimate, not an observed customer bill, and local quotes vary.
Southern flying squirrel, Glaucomys volans
Squirrel in a live cage trap

Who This Is For

This guide is written for New Jersey homeowners who hear scratching or scampering in their attic, property managers dealing with tenant complaints about squirrels, and landlords who want to protect their investment. If you've noticed chewed wires, droppings, or strange noises, you're in the right place. We'll cover everything from identifying an infestation to choosing between DIY and professional services, with state-specific insights on regional differences across New Jersey.

$200–$600
Squirrel trapping, U.S. publisher estimate (Fixr, Jan 2025)
Source: Fixr squirrel removal costs
54%
NE Illinois homeowners with wildlife problems in prior year (INHS, 2013)
Source: Illinois Natural History Survey: homeowners and wildlife
57%
U.S. respondents using store-bought pest products (ConsumerAffairs, 2024)
Source: ConsumerAffairs household infestation survey
Two, with 1-8 pups each
Gray squirrel litters per year
Source: Penn State Extension
Mid-December or early January, and again in June
Gray squirrel breeding periods
Source: Penn State Extension
5 species
Tree squirrel species in Pennsylvania (typical eastern set)
Source: Penn State Extension
5 to 8 young on average
California ground squirrel litter size
Source: UC IPM

The Problem

squirrels enter homes through the smallest of openings—a gap as narrow as 1.5 inches is enough for a gray squirrel to squeeze through. They often access attics via rooflines, soffits, vents, or gaps where utility lines enter. Once inside, they build nests, store food, and raise young. Their incisors grow continuously, so they gnaw constantly on wood, plastic, and wiring to keep teeth trimmed. This gnawing can strip insulation from electrical wires, creating a serious fire hazard. The National Fire Protection Association (NFPA) estimates that rodents—including squirrels—cause up to 20% of undetermined electrical fires in the U.S. each year. Beyond fire risk, squirrels contaminate insulation with urine and feces, which can cause odors and attract other pests.

Warning Signs

  • •Scratching, scampering, or thumping sounds in the attic, especially early morning and dusk.
  • •Gnaw marks on wooden beams, electrical wires, or plastic pipes.
  • •Droppings: oblong, 3/8 inch long, dark brown, often near entry points or nesting areas.
  • •Nests made of leaves, twigs, and insulation in corners or on top of attic beams.
  • •Chewed holes in soffits, fascia boards, or roof vents.
  • •Strange odors from urine or dead squirrels trapped in walls or chimneys.
  • •Squirrel tracks or tail drag marks in dust or insulation.

Risks of Waiting

  • ⚠Fire hazard from gnawed electrical wires—squirrels are a leading cause of attic fires.
  • ⚠Structural damage as they enlarge holes in wood, drywall, or siding.
  • ⚠Health risks from droppings and urine (histoplasmosis, leptospirosis).
  • ⚠Secondary infestations by fleas, mites, or ticks carried by squirrels.
  • ⚠Increased repair costs as damage worsens and nests multiply.
✅

Do you have a squirrel problem?

Treatment Options

One-way exclusion doors

Quoted after inspection

A device that lets squirrels leave but not re-enter. Best for single entry points after confirming no babies are present.

1-2 weeksBest: Attic squirrels with one or two known entry points

Cage trapping

Quoted after inspection

Live traps placed near entry points or along travel routes. Requires checking and handling, often done by pros due to regulations.

VariesBest: Situations where exclusion is not feasible or squirrels are in walls

Entry sealing and repair

Quoted after inspection

After removal, sealing all gaps with metal flashing or heavy-duty materials to prevent future entry. Essential for long-term success.

1-2 daysBest: Prevention after removal

Habitat modification

Varies

Trimming tree limbs away from the roof and removing food sources like bird feeders to discourage squirrels from approaching.

OngoingBest: Reducing the chance of re-infestation
Squirrel inside an attic
Squirrel leaf nest, or drey, in a tree

Squirrel Species You'll Meet in New Jersey

New Jersey has several squirrel species, but the ones that cause the most trouble are eastern gray squirrels and southern flying squirrels. Eastern grays are large, bushy-tailed, and active during the day. They can cause significant damage by chewing through wood and wires. Southern flying squirrels are smaller, nocturnal, and often glide between trees. They are social animals that may live in colonies, and they often enter attics in groups. Red squirrels and fox squirrels are less common but can also be pests. Red squirrels are small and aggressive, while fox squirrels are larger and often found in wooded areas. Knowing which species you're dealing with helps in choosing the right removal strategy, as their behavior and entry patterns differ.

A Month-by-Month Timeline for New Jersey

Squirrel activity in New Jersey follows their breeding cycles. Eastern grays breed in mid-December to January and again in June. This means you might hear scratching in your attic in late winter and mid-summer as they prepare nests. In early spring, baby squirrels are born, and by late spring, they are ready to leave the nest. Summer brings a second litter, and by fall, young squirrels are dispersing, sometimes finding their way into homes. Winter is a critical period when squirrels seek warm shelter, so be vigilant about sealing gaps before temperatures drop. Understanding this timeline helps you time your exclusion efforts to avoid orphaning young squirrels.

What Does a squirrel Inspection Look Like?

When you hire a professional in New Jersey, the first step is a thorough inspection. They'll walk the exterior of your home, looking for entry points at rooflines, fascia, vents, and construction gaps. They'll also check for chew marks, droppings, and tracks in your attic. Using a flashlight, they'll examine insulation and wiring for damage. They may use a boroscope to look inside walls. After identifying active areas, they'll recommend a removal plan. This might involve one-way doors or traps. They'll also advise on sealing and repairs. A good inspector will explain what they found and why they recommend a certain approach, giving you a clear picture of the problem.

How NJ Homes Affect Squirrel Control

New Jersey has a mix of older homes with character and newer builds. Older homes often have more gaps and openings that squirrels can exploit, such as loose siding or rotted wood. Newer homes may have better sealing but can still have vulnerable points around roof penetrations. The type of home you have affects the cost and complexity of squirrel control. With a median home value around $360,000 across New Jersey, most owners are protecting real equity, and a chewed roof edge left alone for a season turns a small carpentry bill into a roof repair. For example, a multi-story Victorian with many eaves and overhangs may require more time to inspect and seal. A single-story ranch might be simpler. Also, homes near parks or wooded areas are more likely to see squirrel activity, as they provide easy access to food and shelter.

Renters and Landlords: Who Pays for Squirrel Removal?

When squirrels invade a rental property, the responsibility often falls on the landlord, as they are responsible for maintaining the property's structural integrity. However, if the tenant caused the problem by leaving doors open or feeding squirrels, they might be liable. In New Jersey, it's important to check the lease agreement. Landlords should ensure entry points are sealed and address any damage. Tenants should report signs of squirrels promptly to prevent escalation. If you're a tenant, document everything and communicate with your landlord. If you're a landlord, address issues quickly to avoid legal disputes and maintain a safe living environment.

When Is Squirrel Activity an Emergency?

While squirrels are not usually an emergency, certain situations require immediate attention. If a squirrel is trapped inside your living space, like a bedroom or kitchen, it can pose a bite risk. If you see chewed wires, there's a fire hazard. If you suspect a squirrel has died in your walls, it can cause a terrible odor and attract flies. In these cases, call a professional right away. Also, if you hear frantic scratching or see a squirrel struggling in a vent, it may be trapped and need help. Professionals can safely remove the animal and address the issue.

DIY vs Professional Squirrel Control

FactorDIYProfessional
CostLow ($50–$200 for materials)Moderate to high ($250–$1,500)
EffectivenessOften incomplete; missed entry pointsComprehensive with warranty
TimeHours to days of labor1–3 visits over 1–2 weeks
RiskBites, falls, or improper sealingTrained, insured, safe
Legal complianceMay violate NJ relocation rulesFollows state regulations

What Affects Cost

  • ✓Severity of infestation (number of squirrels, extent of damage).
  • ✓Accessibility of entry points (roof pitch, height, complexity).
  • ✓Type of repair materials needed (steel mesh vs. wood replacement).
  • ✓Number of exclusion doors or traps required.
  • ✓Local labor rates in New Jersey (higher in northern metros, lower in rural areas).
  • ✓Seasonal demand (peak seasons in spring and fall may increase costs).
  • ✓Inclusion of attic cleanup and insulation replacement if contaminated.
📊

What is the most common reason you would call a squirrel control professional?

When to Call a Professional

Call a professional immediately if you hear scratching, gnawing, or scampering in your attic, especially during breeding seasons (late winter/spring and late summer/fall). If you see droppings, chewed wires, or visible entry holes, don't wait. DIY attempts often miss hidden entry points or fail to exclude all squirrels, leading to recurring problems. A professional inspection is free and gives you a clear picture of the situation.

DIY vs Professional

DIY squirrel control has limited success. Sealing entry points yourself may work if you can identify every gap and use durable materials like 1/4-inch hardware cloth. However, most homeowners miss small gaps or use flimsy materials that squirrels chew through. Trapping without exclusion is futile—new squirrels will move in. Professionals have specialized tools, training, and materials (e.g., one-way doors, heavy-duty sealants) and offer a guarantee. For most New Jersey homeowners, the cost of a pro is offset by long-term peace of mind and avoidance of repeat infestations.

Local Context

Across the 21 New Jersey cities in our data, the numbers point the same direction. Median winter lows near 25F push grays and flying squirrels toward any warm cavity they can reach, and attics win. About 48 inches of rain a year keeps roof edges damp, so drip edge and soffit seams give way sooner here than in a dry climate. Housing is the other half of the picture: rowhomes and prewar frame houses along the corridor sit next to postwar suburban ranches, and the two fail in different places. Old houses leak at the fascia return and the chimney flashing; newer ones leak at roof penetrations and builder gaps behind gable vents. Coastal towns add salt air and faster wood decay. Wherever you are in the state, the fix is the same order of operations: get the animals out, then close the holes with metal.

Prevention Tips

  • ✓Trim tree branches to at least 10 feet from your roofline
  • ✓Install mesh screens over vents and chimneys
  • ✓Seal gaps around pipes, cables, and utility lines entering your home
  • ✓Use metal flashing on corners and eaves where squirrels chew
  • ✓Keep bird feeders away from the house or use squirrel-proof feeders
  • ✓Inspect your attic periodically for signs of entry
  • ✓Secure trash cans and compost bins
  • ✓Consider motion-activated lights or sprinklers to deter activity

💡 Did You Know?

  • ★squirrels use elaborate fake-burying tactics to fool food thieves—they dig a hole, pretend to drop a nut, then cover it up while actually keeping the nut hidden elsewhere.
  • ★squirrels can rotate their ankles 180 degrees to climb down trees headfirst, giving them exceptional agility on vertical surfaces.
  • ★Eastern gray squirrels have excellent spatial memory and can remember the locations of thousands of hidden nuts months later.

Frequently Asked Questions

How do I know if I have a squirrel in my attic?
Listen for scratching or scampering sounds, especially at dawn and dusk. Look for droppings (oblong, dark, about 3/8 inch), gnaw marks on wood or wires, or nests of leaves and insulation. You may also see squirrels entering through roofline gaps.
Can I use poison to kill squirrels in my attic?
No, poison is not recommended and may be illegal for squirrels in New Jersey. Poisoned squirrels can die in walls, causing odors and attracting flies. It also poses risks to pets, children, and non-target wildlife. Humane exclusion or trapping is the proper approach.
How much does professional squirrel removal cost in New Jersey?
Removal alone ranges from $250 to $500. Full exclusion and repair can cost $500 to $1,500 depending on the extent of damage and number of entry points. Most companies offer inspection terms that vary by provider and provide a detailed estimate.
Will squirrels leave on their own?
No, once they establish a nest, they will stay unless forced out. They may leave temporarily but will return. Professional exclusion is needed to ensure they exit and cannot re-enter.
Are squirrels dangerous?
squirrels can bite or scratch if cornered, and their gnawing on wires creates a fire hazard. Their droppings and urine can carry diseases such as leptospirosis and histoplasmosis. They also bring fleas and ticks into your home.
What is the best way to prevent squirrels from entering my attic?
Seal all gaps larger than 1/2 inch with heavy-duty materials like steel mesh, metal flashing, or caulk. Trim tree branches at least 6 feet from the roof. Install chimney caps and vent covers. Inspect your roofline annually for new openings.
Do I need to clean my attic after squirrels are removed?
Yes, if there is heavy contamination from droppings, urine, or nesting materials. Professional cleaning and insulation replacement may be necessary to eliminate odors and health hazards. Some wildlife removal companies offer this service.
How long does the exclusion process take?
Typically 1 to 2 weeks. One-way doors are left in place until all squirrels have exited, then the entry points are permanently sealed. Trapping may take longer if multiple squirrels are present.

Related Pages

Content provenance and service transparency

Statistics on this page come from named public surveys, studies and published cost guides, cited inline with their dates and populations; they are not this site's own customer data and do not describe any specific property. Content was drafted with an editorial pipeline and reviewed on September 11, 2026 for source fidelity, claim wording and local relevance. Provider availability, pricing, credentials and service terms must be confirmed directly.

Published by Squirrel Exterminator ¡ No named licensed-professional review is claimed ¡ Updated 2026-09-11T20:15:35.063Z

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