Bats don’t need much space to sneak into your home — even a gap as small as ⅜ of an inch is enough.
In Michigan, we often meet homeowners who don’t realize they have a bat problem until they hear scratching in the attic or find droppings near a window. By then, the colony has already made itself comfortable. The good news? With the right inspection and sealing process, bats can be removed humanely and kept out for good.
Why Bats Choose Michigan Homes
Michigan is home to several bat species that prefer dark, warm, and safe roosting sites. Attics, chimneys, and wall cavities mimic their natural habitats, making them attractive nesting spots. Once bats find their way in, they return year after year — which is why identifying entry points is critical.
1. Attics – The Most Common Roosting Area
Attics provide everything bats need: warmth, shelter, and quiet. That’s why most bat infestations we handle start here.
A Lansing homeowner contacted us about a strange odor upstairs. During inspection, we found guano piles and grease stains along rafters — evidence of a colony that had been there for at least two summers.
Signs bats are in your attic:
- Droppings on the floor or insulation
- Strong ammonia-like odors
- Grease marks near rafters or roof joints
- Chirping or scratching sounds at night
2. Chimneys and Fireplaces
Chimneys are essentially caves, which makes them an easy roost for bats. If a chimney cap is missing or loose, bats can slip inside and rest on the flue or damper.
Many Michigan homeowners only discover the problem when a bat accidentally flies into the living room. It’s unsettling — but it’s also a sign that more may be living above.
Pro Tip: Install a properly fitted chimney cap to block wildlife entry.
3. Roof Edges, Soffits, and Fascia Boards
Rooflines are one of the most overlooked bat entry points. Weather damage and natural wear create tiny cracks under shingles, soffits, or fascia boards. Even the smallest gap can invite bats inside.
In Grand Rapids, a family reported faint squeaks at dusk. Our inspection revealed over a dozen small gaps in the soffits, which had allowed a colony to slip into the attic.
Why it matters: One small hole can lead to years of infestations if left unsealed.
4. Vents – Attic, Gable, and Dryer Vents
Vents are designed for airflow, but weak or damaged screens turn them into entry points. Gable vents, in particular, are a common hotspot.
This is a big one we see in Michigan: homeowners seal roof cracks but overlook vents, only to discover bats are still getting inside.
5. Loose Siding, Shutters, and Window Frames
While less common, bats can squeeze behind warped siding, gaps in shutters, or around old window frames. From there, they may spread into walls or attics.
Why Ignoring Bat Entry Points Is Risky
A single bat may not seem like a big deal, but bats rarely travel alone. Left unchecked, they bring serious problems:
- Health Risks: Bat droppings (guano) can spread Histoplasma spores, leading to respiratory illness.
- Structural Damage: Guano corrodes insulation and wood, leaving lasting stains and odors.
- Recurring Infestations: Bats return to the same roost year after year if entry points aren’t sealed.
And remember — bats are protected in Michigan. DIY trapping or killing is illegal and unsafe. Humane exclusion is the only effective solution.
How Michigan’s Bat Expert Seals Homes for Good
At Michigan’s Bat Expert, we don’t just remove bats — we make sure they can’t come back. Here’s how our process works:
- Full Home Inspection – We carefully inspect attics, chimneys, vents, and rooflines to locate every entry point.
- One-Way Exclusion Doors – These allow bats to leave but prevent them from re-entering.
- Sealing and Repairs – We close off every gap, from roof cracks to loose siding.
- Attic Restoration (if needed) – We clean guano, replace insulation, and restore your attic to safe condition.
This approach ensures the bats leave — and your home stays protected.
Bats play an important role in Michigan’s ecosystem, but they don’t belong inside your home. If you’ve noticed droppings, stains, or squeaking sounds, it’s time to check for entry points. The sooner you act, the easier it is to solve the problem before a full colony takes hold.
At Michigan’s Bat Expert, we’ve helped thousands of homeowners across the state reclaim their homes safely, legally, and permanently. If you suspect bats are hiding in your house, schedule an inspection today and let us seal them out for good.
Sam Sullivan is the owner and lead expert at Michigan’s Bat Expert, specializing in humane bat removal and exclusion services based in Oakland County, Michigan. With years of hands-on experience in wildlife control, Sam has helped countless homeowners and businesses protect their properties from bat and wildlife infestations while adhering to Michigan’s strict wildlife laws.
His expertise lies in exclusion and prevention, ensuring that bats and wildlife are removed safely and never return. Sam is dedicated to ethical and effective solutions, using proven methods that prioritize both property protection and wildlife conservation. His commitment to excellence has made Michigan’s Bat Expert a trusted name in the industry.