The short version
Bat control is three jobs: exclude the colony with one-way cones outside maternity season, seal every gap larger than 3/8 inch, and clean the guano safely. Bats are a rabies vector and a protected species, so it's a licensed professional's job.
- Bat control is three jobs: exclude, seal, clean.
- Exclusion is timed outside maternity season, May through August.
- Bats are a rabies vector and guano carries Histoplasma — a pro's job.
- Seal every gap larger than 3/8 inch.
For anyone seeing bats at dusk, finding guano, or dealing with a bat indoors. In Bat Control, if a bat was in a room where someone was sleeping, contact your health department first.
What to look for
The problem is the roost and the entry — not the one bat you see. They're a protected species, a rabies vector, and their guano carries Histoplasma fungus. Bats roost in attics and walls, entering through gaps as small as 3/8 inch, and they return to the same roost year after year.
- 1Bats flying out of the roofline or eaves at dusk.
- 2In Bat Control, squeaking and chirping at dusk and dawn from an attic or wall.
- 3Guano — dark, crumbly droppings — piled under an entry gap or in the attic.
- 4A gap as small as 3/8 inch in the roof, soffit, or vent.
- 5A bat found inside the living space, especially in a room where someone was sleeping.
- 6A greasy stain around a roofline opening, left by bats squeezing in and out.
- 7A heavy, ammonia-like smell in the attic or a wall, left by a long-established colony.
- 8Shiny insect-wing flecks inside guano, which crumbles to dust under light pressure.
Why it’s worth acting soon
- Bats are a leading source of rabies exposure in the U.S., though most bats are not rabid.
- Guano can harbor Histoplasma fungus, a respiratory risk if the spores are inhaled.
- Accumulated guano damages insulation and causes odor, and the colony grows each year.
- Exclusion during maternity season can strand flightless pups.
- A bat in a sleeping room is treated as a possible exposure, because bites are small and easy to miss (CDC).
- A roost left alone grows larger, which makes the eventual exclusion and cleanup bigger and costlier.
$400–$1,500Typical bat exclusion (published range)Fixr Treatment options and typical costs
Inspection and roost mapping
$150–$300
A provider confirms the roost and every entry gap, and times the work around maternity season. The inspection may include a dusk emergence count to size the colony.
- Time
- 45–90 minutes
- Best for
- Any sighting or dusk activity.
Exclusion with one-way cones
$400–$1,500
One-way cones let bats leave but not return, installed outside maternity season. The cones stay up for a few days to a week while the whole colony leaves on its own.
- Time
- A few days to a week
- Best for
- A roost in an attic or wall.
Sealing and repair
$300–$1,000+
Sealing every gap larger than 3/8 inch after the bats are out, and repairing any damage to the roofline, soffits, or vents.
- Time
- Half day to a full day
- Best for
- Preventing re-entry.
Guano cleanup and decontamination
$500–$2,500+
Removing guano and soiled insulation with protective gear, and treating the area for Histoplasma. Often the largest line item after the exclusion.
- Time
- Half day to a day or more
- Best for
- An attic with accumulated guano.
Prices are typical published ranges. Ask what’s included before you compare quotes.
A cluster in the rafters means a roost. Leave them be until pups can fly.The three jobs of bat control.
- Every bat problem is three jobs in order. - Get them out: one-way cones let the colony leave humanely. - Close the door: seal every gap larger than 3/8 inch. - Clean the roost: remove the guano and soiled insulation safely.
A typical quote covers only the first job. Ask which of the three a provider covers.
The two risks that make bats a pro's job.
Bats are a leading source of rabies exposure in the U.S., though most bats are not rabid (CDC) — a bat in a room where someone slept is treated as a possible exposure. Their guano carries Histoplasma fungus, a respiratory risk if the spores are inhaled (CDC). Both are why you don't handle bats yourself.
Check the whole outside of the house. Bats need only a half-inch gap.Maternity season changes everything.
Bats are protected, and exclusion during maternity season — roughly May through August — can strand flightless pups in your walls. The legal and humane window for exclusion is late fall and winter, after bats have left. Timing is the single most important part of bat control.
The 3/8-inch rule.
Bats squeeze through gaps as small as 3/8 inch — about the width of a pencil. That's your sealing standard: any opening in the roofline, soffit, or vent larger than 3/8 inch is a door. Screen the vents, cap the gaps, and the roost can't be re-established.
What bat control costs.
Published ranges put exclusion around $400 to $1,500, sealing from $300 up, and guano cleanup from $500 up (Fixr). The factors that move the price are the roost size, the entry points, the cleanup, and the height and access of the roofline.
When to call.
Call a licensed professional when bats are roosting in the attic or walls, when you find guano, or when a bat is indoors — especially if someone was sleeping nearby. Exclusion must be timed outside maternity season, so a licensed wildlife professional is required.
How the exclusion actually works.
A provider confirms the roost and every entry point, then mounts one-way cones over each gap so bats can fly out but not back in. The cones stay for a few days to a week while the whole colony leaves on its own, with no handling. Once the roost is empty, the cones come off and every gap is sealed. It's a leave-them-alone approach, not a trap-and-relocate job.
Guano cleanup is a separate health job.
After the bats are out, the guano and any soiled insulation have to come out safely. Guano can carry Histoplasma fungus, which causes a respiratory illness if the spores are inhaled (CDC), so cleanup means protective gear, careful removal, and treating the area — not sweeping it into a trash bag yourself. This is often the biggest line item after the exclusion.
Why sealing is the part that lasts.
Exclusion removes the colony that's there now; sealing removes the reason the next colony would move in. Every gap larger than 3/8 inch in the roofline, soffits, and vents has to be closed and screened. Skip that step and you'll be doing the whole job again next year, because bats return to the same roost every season.
What affects the price
- In Bat Control, the size of the roost and how many entry points need sealing.
- Whether the attic has accumulated guano that needs cleanup and decontamination.
- The height and accessibility of the roofline.
- Whether soiled insulation needs replacing.
- The timing — exclusion can't be done during maternity season.
- Whether follow-up monitoring is included.
- Whether the inspection is credited toward the work or charged separately.
- The length of the re-service or warranty window that comes with the work.
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What's your biggest concern about bats in your home?
When to call for help
A bat in a sleeping room is a possible rabies exposure, so contact your health department first. Exclusion must be timed outside maternity season, so a licensed wildlife professional is required. Call a licensed professional when bats are roosting in the attic or walls, when you find guano, or when a bat is indoors — especially if someone was sleeping nearby.
What you can do yourself
What isn't yours is the exclusion itself — it must be timed outside maternity season, and guano cleanup needs protective gear. Leave both to a licensed professional. Prevention is safely yours: seal gaps over 3/8 inch and screen the vents in fall and winter.
Where you live matters
Bats roost in homes in warm months and are protected by law. Exclusion is timed outside maternity season, and guano cleanup needs protective gear for the Histoplasma risk.
Bat safety tips
Bats around your area: what to do first
Around houses, bats use gaps at vents, soffits, chimneys and loose siding. Watch the roofline at dusk from a safe spot to see where they come out.
A bat in the house
Don’t touch it with bare hands. If it was in a room where someone was asleep, or near a child or pet, call your doctor or health department before letting it go. Bat bites can be too small to notice.
CDC: rabies and batsDroppings in the attic
Don’t sweep or vacuum dry droppings. The dust can carry histoplasmosis. Small amounts can be wetted down and bagged; big piles are a job for a pro with the right gear.
CDC/NIOSH: histoplasmosisTiming matters
Pups are born in early summer and can’t fly for several weeks. In most states, wait until they’re flying, usually by mid-August, before sealing bats out. Check your state’s rules too.
U.S. Fish & Wildlife Service: why bats matterSimple ways to keep bats away
- In Bat Control, seal every gap larger than 3/8 inch in the roofline, soffits, and vents.
- Screen attic vents and chimney openings with fine mesh.
- In Bat Control, check the roofline each spring before bats return, and again in fall.
- Keep attic and gable vents covered.
- Seal gaps in late fall or winter, after bats have left.
- Don't seal during summer maternity season.
- Seal gaps behind chimneys and around pipes and wiring where they enter the attic.
- Keep attic spaces clean and dry so a future cleanup stays small.
Once the bats are out, every gap gets sealed with lasting materials.Did you know?
A single little brown bat can eat up to 1,000 mosquito-sized insects in an hour.
Bats are the only mammals capable of true sustained flight.
In Bat Control, most bats are not rabid — less than one percent carry the virus, but a grounded or day-active bat is a warning sign.
Questions people ask
Are bats dangerous?
A bat indoors, especially in a sleeping area, is treated as a possible exposure. Guano also carries Histoplasma fungus, a respiratory risk. They're a leading source of rabies exposure in the U.S., though most bats are not rabid (CDC).
When can bats be excluded?
Outside maternity season — roughly late fall and winter. Excluding during May through August can strand flightless pups.
How do bats get into an attic?
Through gaps as small as 3/8 inch in the roofline, soffits, and vents. They return to the same roost every year.
What does a bat exclusion cost?
In Bat Control, published ranges put exclusion around $400 to $1,500, with sealing and guano cleanup adding more (Fixr).
Will bats come back after exclusion?
They'll try, if any gap larger than 3/8 inch is still open. Sealing every gap is what makes exclusion permanent.
Can I remove bats myself?
It's risky and often illegal to do it wrong — bats are protected, and guano cleanup needs protective gear. A licensed professional is the right call.
How long does a bat exclusion take?
A few days to a couple of weeks: inspect and map the roost, mount the cones, confirm the colony is out, then seal the gaps and clean the guano. The cones themselves only need a few days, but sealing and cleanup add time.
What's the first thing to do if I see bats at dusk?
A quick call to a licensed professional tells you where you stand. If it's maternity season, the work waits until fall or winter. Don't seal the gap yourself — first confirm the roost and the season.
Why do bats keep coming back?
Sealing every gap is what makes exclusion permanent. Bats return to the same roost year after year, and any gap larger than 3/8 inch is a door back in. Because the entry gaps are still open.
Sources (5)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Bat Exterminator · Updated October 13, 2026 · How we write these guides