Bat Removal Indianapolis - DNR-Compliant Exclusion, Done in One Season
Bats can’t be trapped, can’t be poisoned, and can’t be touched between May 1 and July 31 under Indiana DNR maternity rules. What they can be is excluded - one entry at a time, with one-way devices, by an operator who reads the building correctly. That’s the only legal and the only permanent answer. Two-year warranty on every exclusion we build.
Bats, the law, and what most operators get wrong
Three things to know up front. First: bats are federally and state-protected. You can’t trap them, kill them, or relocate individuals in your hand. Second: Indiana DNR enforces a maternity blackout from May 1 through July 31. During that window, flightless pups are in the roost. Any operator who tells you they’ll “come out next week and bat-proof the house” on June 15 is either lying or about to break the law. Don’t hire them - if DNR catches it, the homeowner sometimes catches part of the heat. Third: bats don’t chew their way in. They find a gap, almost always an existing gap, somewhere between 3/8" and 1" wide. Fix the gap correctly and the problem ends.
The bat species we see most in central Indiana attics are the big brown bat (Eptesicus fuscus) and the little brown bat (Myotis lucifugus). Big browns are the most common roof and attic colonists - they handle Indiana winters and often stay year-round. Little browns are smaller, prefer warmer roost cavities, and have been hit hard by white-nose syndrome. The Indiana bat (Myotis sodalis) is federally endangered. If we find Indiana bat sign, the job gets a different protocol and additional DNR coordination. We don’t cut corners on identification - the difference matters legally and ecologically.
Most homeowners call us after one of three things happens. They saw a bat fly out of the chimney or attic at dusk. They found a bat inside the living space. Or they noticed dark staining and a smell along the soffit on a hot afternoon. That dark staining is usually calcium and urea buildup from bat urine, often combined with body-oil residue around an entry. Once you know what to look for, the entry is almost always visible from the ground with binoculars - gable end peaks, ridge cap gaps, dormer corners, the seam between a chimney chase and the roof deck, and dried-out caulk lines around fascia returns. We’ve walked roofs where the homeowner has been looking at the entry for six months without recognizing it.
Bad operators do one of two things. They spray the attic with something - useless, because bats live in tight crevices and what matters is the perimeter gaps, not the roost interior. Or they seal entries during the maternity blackout, which traps pups inside. The pups die. The mothers chew or claw new exits. You end up with bats inside your living space within 48 hours. Our exclusion timing follows DNR: full exclusion runs August through April, with August through October being the cleanest window because young of the year are flying.
One last thing on guano. Bat droppings carry the spores that cause histoplasmosis - a real lung infection, not a hypothetical. Active guano piles get full PPE removal: respirators, tyvek, sealed bags, and a misting protocol so we’re not aerosolizing spores into your HVAC. If the colony has been there a year or more, decontamination is usually part of the job, not an upsell.
Our process for a bat exclusion, start to finish
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01
Dusk emergence count & building survey
We sit on the property at dusk and count bats leaving the structure. That tells us colony size and primary entry. The next morning we walk the entire exterior identifying every secondary gap above 3/8". Bats need a hole, not a door.
Day 1 -
02
Timing the job to DNR rules
If we’re in the May 1 to July 31 maternity blackout, we schedule the actual exclusion for August. In the meantime we can do the building survey, the guano assessment, and pre-build any custom exclusion devices. We never work the colony during the blackout.
On the job -
03
One-way exclusion devices on primary entries
We install one-way exclusion devices - typically netting or tube-style depending on the entry geometry - on every active entry. Bats leave at dusk to feed and can’t get back in. Devices stay up 5 to 10 days to clear the colony.
On the seal -
04
Permanent sealing of the perimeter
Once the colony is out, we seal every gap. Hardware cloth where mesh is needed (1/2" for most, 1/4" in some applications). Galvanized steel flashing on roof returns and ridge gaps. Polyurethane sealant - not expanding foam alone - on hairline gaps in fascia, soffits, and chimney chase seams. The job is the seal, not the spray.
Before we leave -
05
Guano cleanup & warranty walk 2-yr warranty
Active guano piles get PPE removal. Heavy contamination may require attic insulation replacement. We photograph everything, document for your records, and you get a two-year warranty on the exclusion build itself.
Final visit
Real price ranges for bat work
Bat jobs scale with the size of the building, the height of the entries, and the size of the colony. Two-story homes with steep pitches and multiple dormers cost more than ranches. Here’s the honest range:
| Job type | Typical range | What drives the price |
|---|---|---|
| Single-family ranch, small colony, 1-2 entries | $850 - $1,400 | One-way devices, basic sealing, low pitch |
| Two-story with dormers, mid-size colony | $1,400 - $2,400 | Multiple entries, height, more flashing |
| Large colony, multi-section roof, extensive sealing | $2,200 - $3,200 | Whole-house perimeter exclusion |
| Guano removal & attic decontamination | $900 - $4,500+ | Volume of guano, insulation replacement |
If you’ve seen a quote under $500 for “bat removal,” ask what the operator is actually doing. Spraying an attic is not removal. The job is the exclusion build.
Source & further reading: CDC on histoplasmosis, Indiana DNR bat exclusion guidance, USFWS on Indiana bat.
Bat questions homeowners ask us
Indiana DNR’s maternity blackout runs May 1 through July 31. Pups inside the roost can’t fly. If we seal entries during that window, the pups die in your walls and the mothers tear new exits, often into your living space. We can inspect, plan, and pre-build during the blackout, but the actual exclusion happens starting August 1.
Don’t release it back outside until you’ve called your county health department and us. Any direct contact with a person while sleeping is considered a potential rabies exposure and the bat may need to be tested. Indiana has a clear protocol for this - we’ll walk you through it the same day.
Visual ID at the entry and at emergence, plus guano morphology. Indiana bat sign triggers additional DNR coordination and a more careful exclusion protocol. We’d rather slow down and confirm than misidentify and create a federal problem.
Yes, particularly when disturbed. Histoplasmosis is a real risk and we treat it as one. Light, isolated droppings on the attic floor are different from a 2-foot pile under a roost. We’ll show you what you have and recommend cleanup proportional to it.
Legally, no - exclusion of a protected species without the right protocol can put you on the wrong side of state and federal law. Practically, the building knowledge is the hard part. Identifying every gap, working at height safely, and choosing the right device for each entry is the actual trade.
Not through anything we sealed - that’s the two-year warranty. New bats walk these roofs every dusk in the summer. If your fascia opens up somewhere we didn’t treat or a storm tears a ridge cap, a new gap is a new invitation. We’ll come back and look at any new sign.
Let’s get the timing right.
Whether you’re inside the DNR maternity blackout or outside it, the first step is the same: dusk count, building survey, honest plan. Free inspection.