Recent Bat Exclusion Projects by BCM, Inc.


Fear turned into fascination, this homeowner wants to keep his bat colony on the property, just not in his attic.


The "One-way door" can be nothing more than a simple screen fastened in such a way that allows bats to escape but not re-enter. Here are big brown bats escaping while one attempts to reenter... bats "home in" on the airflow from the attic and "don't remember" to access the crevice from under the screen.


"One-way doors" are an effective and humane way to exclude bats at certain times of the year. This one is fastened to the peak of the roof.


Exterior showing an unusually extreme amount of bat evidence: droppings and staining


Besides being inhumane, traps, poisons, and ultrasonic emitters do not address the real problem-- more animals eventually entering the structure regardless of how many traps are set. These "quick fixes" only aggravate homeowners with failure and dwindle the pocketbook and are largely a total waste of time

Bat Exclusion Solution

Please note: BCM is presently booked with projects and not accepting new clients at this time. We do not presently endorse another local contractor that we have had good experiance with. If you are an experianced contractor and perhaps would like referals, please contact jchenger@batmanagement.com

Do not bother exterminators who do not specialize in bats, use ridiculous inhumane trap "methods", scare tactics, or chemicals that are simply a waste of time.

The only proven way to deal with bat/human conflicts is a systematic repair of all sides of your structure. Suggestions such as extermination (now illegal in PA and many other states), trap and release, chemical repellents, floodlights, and ultrasonic devices are half hearted attempts at best, and at worst some may actually be dangerous to pets and family. These "methods" do not address the problem at the root: bat entry crevices must be repaired. Otherwise bats just simply keep coming back.

Bat control is non-lethal and relies upon exclusion and sometimes installing bat houses to provide alternative places for bats to live and still provide free insect control nearby. This is sometimes difficult, hazardous work that requires experience with bat behavior, specialized equipment, and a high degree of safety precautions.

Bat Conservation and Management is a wildlife consulting company specializing with bat conflict resolution and exclusions. We do not deal with any type of nuisance wildlife problems other than bat exclusion. We offer several levels of service so homeowners do not pay for services they do not want.

Not located in Pennsylvania? Traveling to your area is no problem, as we have also completed successful bat work in Connecticut, New York, New Jersey, West Virginia, Virginia, South Carolina, North Carolina, Ohio, Maryland, Illinois, Wyoming, New Mexico, Arizona, Kentucky, and Florida. It pays to shop around and compare services...our clients claim our fees are up to half what our competitors estimated. Because of our expertise, we have completed complex projects which other non-specialized contractors have passed by or wildly overbid. Clients include private homeowners, the National Park Service, Pennsylvania State Parks, Department of Defense, the Nature Conservancy, apartment complexes, universities, and various private business locations.

Please note: BCM does NOT make house calls to remove or search for a bat that was seen in the living space of the house. Witnessing a bat fly thru your house does not necessarily constitute a health hazard. See this information on how to remove this bat yourself.

Site Survey

  • We inspect the exterior and/or the interior of the structure noting bat exits. This service can be done year-round.
  • An estimate is given for the bat exclusionary are happy to explain procedures, materials, and timing. Any other possible solutions are discussed and weighed (e.g. increased ventilation, total roof/soffit replacement).
  • We will help you select a site for a bat house which is both suitable for bats and homeowners.
  • A written report with sketches and/or photographs is prepared on request.
  • We can survey the structure during the summer exit flight if needed, noting entrances and counting the actual number of bats involved.
  • In the end, many people are able to take all this information and couple it with work already being planned or simply do it themselves Site surveys range from $50-$150.

Structure Repair

  • Timing is important. If your bats are migratory, October-March is fair game for an all around sealing attempt. Otherwise a more elaborate approach involving bat "escape hatches" is appropriate and usually requires several trips and a degree of patience. This work is also seasonal to avoid entrapping flightless young within the building.
  • The cost of the bat exclusion varies from site to site, depending on the amount of work to be done, the size of the structure, and the site accessibility. Residential structure repairs can range start at $800 but never exceed $3,000.
  • If bats are still using your structure the summer after our sealing because of failed repairs, we will revisit and repair the structure at no labor cost. A basic travel expense may still be assessed, usually up to $300.
  • Extra large complex structures (multiple dormers, towers, bump outs, etc.) or traditionally bat-friendly roof types (slate, tin, Spanish tile, or wood) may require a larger than average level of effort.
  • An active bat exclusion (a sealing attempt when bats are present) may temporarily increase the chances of encountering a bat within the living spaces.
  • We use adhesive caulking, never messy, nasty spray foam for a professional, clean job.
  • We will expect to use relatively lightweight, narrow, and 4WD lift machines almost exclusively on your project. In this way we are able to spend our time inspecting work rather than dealing with cumbersome ladders and scaffolding.
  • Because of the nature of the work, some work may be performed after dark to ensure progress.

Bat House Installation

  • We will help you select a site for a bat house which is both suitable for bats and homeowners.
  • If desired, we then install a premium Bat Can providing all necessary materials (post, pole mount, assembled box, concrete, etc.)
  • Site surveys and installations start at $300 including one Bat Can on a post. Additional quantities at cost on the same visit.
  • A note about bat houses: providing alternate habitat for your displaced colony is an ideal way to keep bats nearby and maintaining the free insect control homeowners already enjoy. Bats will be more likely to favor the new artificial roost nearby over your now difficult to access structure. This reduces the chance of bats becoming imperiled when they must seek other roost structures in the community whose owners may use hazardous or inhumane methods to deal with them. However, simply installing many bat houses does not guarantee any success unless the original structure is successfully repaired.

Recently the PA Game Commission clearly made it illegal for any contractor in Pennsylvania to kill bats. A number of other state wildlife agencies have similar policies, so please be wary of any individual who proposes this "solution" or prepares to seal bats within a building without any allowance for escape.

Areas BCM currently services
residential homes:

PA and MD, occasionally NJ and NY.
Cost ranges from $1500-$2500. Availability is most often November-March. Currently unavailable.

Out of area services; please refer to BCI's list of contractors that have some bat knowledge in your area. (If link is broken go to batcon.org and look for links to getting bats out of houses.)

Areas BCM currently services
commercial or government projects:

Nationwide. Email photos and location of site for quote.

Bat Exclusion Training:
BCM offers a one day program on excluding bats from buildings. Sometimes this is done privately at your site (nationwide) or a more general public program at our office in Carlisle, PA. Send requests to jchenger@batmanagement.com

PA Exclusion: Ideally a bat exclusion netting should hang vertically, allowing bats to drop out from under the netting. Occasionally the entrance crevices do not allow for this.
PA Exclusion: Ideally a bat exclusion netting should hang vertically, allowing bats to drop out from under the netting. Occasionally the entrance crevices do not allow for this.
BCM specializes in bat-related fieldwork,