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Home/Guide overview/Bat: plan post exclusion follow up

How to Plan Your Follow-Up After a bat Exclusion

Most bat jobs fail in the follow-up, not the exclusion itself. The provider installs one-way tubes or netting over the main exits, seals the rest of the roofline, and leaves. What happens next depends on the weather, on whether a secondary opening was missed, and on whether anyone is watching the building at dusk. This guide is a plan for the next six weeks: installation night, the week the devices come down, the two weeks after sealing, and the seasonal check the following spring. bats are protected in most states and cannot be poisoned, trapped, or harmed, so every step is about confirming the animals left on their own and cannot get back in.

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Quick answer

a bat exclusion is finished when the one-way devices have stayed up through at least five to seven warm, dry nights, the exits have been permanently sealed, and a dusk watch shows no bats leaving. Plan the follow-up before the first visit so you know what to check, when, and what to write down.

Key Takeaways

  • →One-way devices should stay up for at least five to seven nights of good flying weather before removal.
  • →Schedule a dusk emergence watch after device removal and again about two weeks later.
  • →Keep a dated log with photos of each sealed opening to compare against the original inspection.
  • →Guano that keeps appearing after sealing is the clearest sign an opening was missed.
  • →Ask the provider in writing what follow-up includes and what triggers a no-charge return.
  • →Research: In Fixr's August 2022 U.S. bat-removal cost guide, sealing entry holes other than gable vents was estimated at $20–$50 apiece, a national publisher benchmark, not a verified transaction price or a current local quote.
Bat resting on tree bark
Attic rafters, insulation and a soffit opening illuminated for inspection

Who This Is For

Homeowners and property managers who have just had, or are about to have, a professional bat exclusion. It is also useful if you are comparing providers and want to know what a responsible follow-up looks like before signing.

$500
Typical small-colony bat removal project, publisher estimate (Fixr, 2022)
Source: Fixr bat removal costs
51.8%
Wildlife-affected NE Illinois households: digging/burrowing (INHS, 2013)
Source: Illinois Natural History Survey: homeowners and wildlife
37%
U.S. homeowners who tried DIY pest control (HomeTeam survey, 2022)
Source: HomeTeam: 2022 homeowner survey

The Problem

bats use the same exits night after night, but a colony often has more than one. The primary exit is usually obvious from staining and guano. Secondary exits, a gap behind a fascia board, a loose ridge cap, a flashing seam, may be used by only a few animals. If they are missed, the colony shifts to them after the main devices go up. Weather complicates timing. bats do not fly on cold or rainy nights, so a device left up five calendar days during a wet week may have been active for two. Without a follow-up watch, nobody knows whether the building is empty. Old guano also keeps falling after the bats are gone and can be mistaken for continued activity.

Warning Signs

  • •Fresh guano under a sealed opening more than a week after sealing
  • •bats seen leaving the roofline at dusk after device removal
  • •Scratching or chirping in walls or attic in the evening
  • •Brown staining reappearing at a seam that was caulked
  • •A single bat found inside a room, especially in late summer
  • •Strong ammonia odor in the attic on a warm afternoon
  • •One-way tube found bent, blocked, or pulled loose

Risks of Waiting

  • ⚠A missed opening lets the colony re-establish before the next maternity season.
  • ⚠bats displaced into living space create rabies-exposure situations for sleeping occupants.
  • ⚠Guano accumulation continues in areas nobody is checking.
  • ⚠Warranty periods may expire before the problem is noticed.
  • ⚠Open roofline gaps admit squirrels, birds, and water.

Treatment Options

Installation-night check

No cost: DIY step

Watch the main exits from about 15 minutes after sunset. Count bats leaving through the devices and note any bat leaving from a spot with no device.

30 minutes at duskBest: Confirming devices are placed at the active exits

Device-period weather log

No cost: DIY step

Each evening, write the date, low temperature, and whether it rained. Nights below about 50 F or with steady rain do not count. Share the log before removal.

One minute per night for 5 to 10 nightsBest: Knowing how many real flying nights have passed

Device removal and final sealing

Typical published range: $150–$500 when billed separately

The provider removes tubes or netting and seals the exit. Be present, photograph each sealed spot, and confirm the material matches your agreement.

One visit, 1 to 3 hoursBest: Closing the last openings once the building is empty

Post-sealing emergence watch

No cost: DIY step

Repeat the dusk watch on the first warm, dry evening after sealing and again two weeks later. Zero bats on both nights is the result you want; any bat means a call to the provider.

Two 45-minute sessions at duskBest: Verifying no bats remain after sealing

Provider warranty re-inspection

Typical published range: included, or $100–$250

Many agreements include one return visit within the warranty period. Schedule it near the end of that window so any re-entry has had time to show itself.

One visit, about 1 hourBest: Documenting the building is closed before warranty ends
Metal mesh and sealant around an exterior pipe penetration
Flashlight inspection of a door threshold and foundation joint

A six-week follow-up calendar

Week one is the device period. On installation night, watch from about 15 minutes after sunset and count what leaves and where. Every night after, write the low temperature and whether it rained. Walk the exterior once mid-week to confirm each tube or net is intact and not blocked. Do not touch the devices. Week two is removal. When you and the provider agree that five to seven flying nights have passed, schedule the visit and be present. Photograph each opening before and after sealing. On the first warm dry evening after, do a full dusk watch. The goal is zero bats. Weeks three and four are the quiet check. Place clean cardboard under the former exits and check it every few days. Do a second dusk watch at the end of week four. Weeks five and six are paperwork. Put photos, logs, and the completion report in one folder, and put the warranty end date on your calendar with a reminder six weeks before it.

What a good provider follow-up sounds like

When you ask what follow-up includes, the answer should be specific. A good answer names the number of flying nights required, says who decides when weather has cooperated, and confirms that removal and sealing are a scheduled visit rather than something you do yourself. It also states what happens if you see a bat afterward: a return within a stated number of days, at no added charge inside the warranty period. A weaker answer sounds like this: the devices can come down whenever you like, you can pull them yourself, and any callback is billed at the standard rate. That shifts the risk to you. Ask three direct questions. What is the minimum device period and how do you count it. Is device removal a scheduled visit included in the quote. If I see a bat after sealing, what do I do and what does it cost. Write the answers beside each question, and if the written agreement does not match, ask for it to be corrected before work starts.

Rabies exposure during the follow-up period

The weeks around an exclusion are when bats are most likely to end up inside a home. A young bat not yet flying when the adults left, or an adult confused by a newly sealed exit, may find its way into a bedroom. Public health agencies treat certain situations as potential rabies exposures even without a visible bite, because bat bites can go unnoticed: a bat found in a room with a sleeping person, an unattended child, or someone who cannot report contact. If that happens, do not release the bat. Close the door, wait for it to land, and cover it with a box. Slide stiff cardboard under it, tape it shut, and wear thick gloves. Never touch a bat with bare hands. Call your health department about testing. Post-exposure treatment is highly effective when started promptly, and a negative test can spare people from needing it. If everyone present is awake and certain there was no contact, opening a window usually lets the bat leave. Tell the provider about any indoor bat, since it points to a route from roost to living space.

Bat problems by the numbers

Homeowners often ask whether a bat problem is unusual and whether a quoted price is normal. Public research cannot answer either question for one house, but it does set expectations. Here is what the sources report. Between $405 and $600 was the estimated cost to exclude a medium-sized bat colony in Fixr's August 2022 U.S. bat-removal cost guide, not counting inspection or cleanup; the figure is a publisher's estimate, not a verified customer bill, and quotes vary by location. Among the 518 action-takers in the Illinois Natural History Survey's (INHS) July to October 2012 survey of homeowners in the greater metropolitan area of northeastern Illinois (reported 2013), 40.0% said they had used commercial repellents, one of several options they could select. Roughly one in five homeowners who acted on a wildlife problem spent $200 or more, according to the Illinois Natural History Survey's (INHS) 2012 survey of 506 northeastern Illinois action-takers (reported 2013); that is a regional figure from over a decade ago, not today's pricing. Droppings are often the first evidence a homeowner finds: 34.3% of the 859 wildlife-affected northeastern Illinois households in the Illinois Natural History Survey's (INHS) 2012 survey (reported 2013) cited them, a regional multi-select figure that also flags a cleanup and health question. Most homeowners reach for the hardware-store aisle first: 57% of the 2,000 U.S. respondents in ConsumerAffairs' February 2024 survey of 2,000 U.S. respondents reported using store-bought pest products, a self-reported finding from a mixed pest-and-mold survey that speaks to habits, not infestation rates. Because every figure above has a stated population and date, you can cite it when comparing providers. What none of them can tell you is what your specific property needs; that still takes an on-site inspection.

Options at a glance

MethodTypical published rangeBest forTime on site
Installation-night checkNo cost: DIY stepConfirming devices are placed at the active exits30 minutes at dusk
Device-period weather logNo cost: DIY stepKnowing how many real flying nights have passedOne minute per night for 5 to 10 nights
Device removal and final sealing$150–$500 when billed separatelyClosing the last openings once the building is emptyOne visit, 1 to 3 hours
Post-sealing emergence watchNo cost: DIY stepVerifying no bats remain after sealingTwo 45-minute sessions at dusk
Provider warranty re-inspectionincluded, or $100–$250Documenting the building is closed before warranty endsOne visit, about 1 hour

What Affects Cost

  • ✓Whether device removal and sealing were priced into the original job or billed separately
  • ✓Length of the warranty period, commonly one to five years
  • ✓Roof height and pitch, which affect ladder or lift time on return visits
  • ✓Number of exit points that had devices installed
  • ✓Whether guano cleanup is part of follow-up or a separate service
  • ✓Travel distance for callbacks
  • ✓Repairs found during follow-up, such as rotted fascia

When to Call a Professional

Call the provider the same day if you see a bat leave the roofline after devices were removed, if a device is damaged or dislodged, or if a bat appears inside. Do not seal a new opening yourself while devices are up; you may trap animals inside. Call your local health department if a bat is found in a room where someone was sleeping, or with a child or anyone who cannot say whether they were bitten. Public health guidance treats that as a possible rabies exposure. Contain the bat without touching it and ask about testing before releasing it.

DIY vs Professional

The watching and recording parts of follow-up suit a homeowner. You are on site every evening, you know what the building normally sounds like, and you can photograph a sealed seam in daylight. A weather log and an emergence log cost nothing and give the provider exactly what they need. The physical work is different. Removing devices and sealing high gaps carry fall risk, and legal risk if bats are still present; in most states, sealing bats inside a structure is a violation. Leave removal and final sealing to the provider, and use your records to hold them to the agreed scope.

Prevention Tips

  • ✓Photograph every sealed opening in daylight the week after sealing
  • ✓Keep the weather log and emergence log with the service agreement
  • ✓Trim tree limbs that touch or overhang the roofline
  • ✓Check ridge vents, gable vents, and chimney caps each spring
  • ✓Inspect sealant seams after the first winter for cracking
  • ✓Add a dusk watch to your calendar every May and August
  • ✓Check the attic for fresh guano twice a year

💡 Did You Know?

  • ★A little brown bat can squeeze through a gap under half an inch wide.
  • ★Big brown bats often return to the same roof roost for many years.
  • ★bats do not chew or enlarge openings; they use existing gaps.

Frequently Asked Questions

How long should bat exclusion devices stay up?
Most published guidance calls for at least five to seven nights of good flying weather, meaning evenings above roughly 50 F without steady rain. Cold or wet nights do not count. Keep a nightly weather note so you and the provider agree on the count.
What if I still see bats after the exclusion?
Note the time, the exact spot, and the number of bats, then call the provider. a bat leaving after sealing means an opening was missed or a seal failed, and most agreements cover a return visit. Do not seal the spot yourself. If the bat appeared indoors, contact your health department first.
Why is there still guano after the bats are gone?
Old guano loosens and falls for weeks as weather warms. The test is whether new droppings appear on a clean surface. Put cardboard below the old exit and check it after a week of warm nights. Fresh guano suggests activity; nothing new suggests old material settling.
Should I be home when the devices are removed?
Yes, if possible. Being present lets you confirm the devices are taken down rather than closed off, see what sealant or mesh goes into each opening, and photograph the work. It is also the moment to ask about anything that looked different from the original inspection.
When is the best time of year to do follow-up checks?
Late spring, when bats return, and late summer, when young bats begin flying, are when a missed opening shows itself. Plan a dusk watch in each. If your exclusion happened in fall, the following May is the real test, because a colony may try to return.
Does a bat exclusion warranty cover new openings?
Usually not. Most warranties cover the areas the provider sealed and the devices they installed. A new gap from storm damage, a new roof, or a contractor pulling off trim is typically excluded. Keep your own photos of every sealed location.
Do most homeowners do anything about nuisance wildlife?
Most do, though a sizable share wait it out. In the Illinois Natural History Survey's (INHS) 2012 survey of homeowners in the greater metropolitan area of northeastern Illinois, reported in 2013, 62% of 830 households with a wildlife problem took corrective action, which leaves roughly 38% who did nothing. The result is regional, not national. If an animal is inside a structure rather than just passing through the yard, waiting tends to raise the eventual repair bill, so act early.
How many homeowners have problems with nuisance wildlife?
In one of the few detailed regional surveys, a majority did. The Illinois Natural History Survey (INHS) surveyed 1,576 homeowners in the greater metropolitan area of northeastern Illinois between July and October 2012 and reported in 2013 that 54% had experienced wildlife problems around their home in the preceding year. That is a single-region result, not a national prevalence rate. Keep a simple log of dates and damage so any professional you consult can work from evidence.

Related Pages

Bat Control in Aberdeen, SDHow to Coordinate Bat Inspections in a Multi-Unit BuildingBat Control for Property Owners: Legal, Humane, EffectiveHow to Prepare Timing Questions Before Scheduling a bat ExclusionHow to Compare Itemized Bat Exclusion Quotes Line by LineHow to Coordinate Bat Inspections Across Several Buildings

📚 Sources & Further Reading

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 Bat Exterminator · No named licensed-professional review is claimed · Updated 2026-09-11T10:32:21Z

How this content is produced and corrected

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