Order: Chioptera

This page provides homeowners with information on techniques to control bats in dwellings.


Are Bats Living In My House?

There are a few clues to look for in determining if bats are living in your house.

1. If you have had two or more encounters with bats flying around your house within one calendar year, then you probably have bat droppings in middle of attic bats.

2.  If you find piles of mouse like fecal material in your attic or on the ground outside your house, then you probably have bats. (Bats defecate before they enter your home and below where they roost for the day see photo)bat droppings bat guano Make sure that the fecal material is not old by laying down a piece of newspaper and see if any more droppings fall on the paper. If there is, you have bats. (Just a word of caution about droppings. They can carry a fungus known to cause Histoplasmosis. Don't breathe the feces and avoid contact with them. Ideally, you should wear a HEPA filter mask and spray the fecal material down with 10% bleach solution). You can distinguish between bat droppings and mouse droppings in two ways. First, bat droppings tend to be clustered as they will pile up below where the bat is roosting. Second, bat droppings will have a shiny speckled appearance (from all the insect wings) and will crumble like dust when touched. Mouse droppings on the other hand, tend to be scattered about and become hard when dry.

3. You see bats flying around your dark house constantly and even see them disappear. Performing a bat watch at dusk is an ideal way of determining if you  have bats. While it is not one hundred percent accurate, it is still worth doing. Perform a bat watch by having people stand by your house at dusk till dark. They should be positioned to see as much of the house as possible. The first person to see a bat should shout out. If you have trouble identifying the specific hole, concentrate on the side of the house where the first person saw the bat. Only perform bat watches on non-rainy nights.

4. If you have a bat flying in your home during the winter time, then you can be certain bats are living in your home as they have decided to hibernate there.

Other Signs of Bats

Bat control video for T.V.

When Are Bats Active During the Year?

I just saw my first bat of the season in an attic vent on 3/23/99

Bats hibernating in your home can also become active during the winter. The reason for this is either your home gets too warm and they think it is Spring or it is too cold and they must move to warmer cover.  If you ever have a bat in your home during the winter time, it is proof that bats were hibernating in your home.

Strategies For Evicting Bats From Your Home (click for other videos)

homeowners guide to bat control video350104 Bat Free Belfries: A Guide To Bat-Proofing Video

Email for availability

(Margaret Brittingham & Lisa Williams-Whitmer)

This Pennsylvania State University duo of wildlife biologists has put together a video that explains bats and their manners, along with bat biology. The best way to remove bats from homes is shown along with how to bat-proof your home once the bats have been evicted. Finally, how to build bat houses and theories of placing a bat house are explained.

If the colony is already established at your home, you need to determine if young are present. Young are flightless until about mid august. (remember all dates in animal damage control are generalities. Your situation may be different. Dates can be off in your situation by as much as thirty days or more). Nevertheless the times to be wary of bat exclusion, unless you don't care about killing the young, is between June and mid-August.  

The abbreviated process for excluding bats from your building can be outlined as follows: Exclusion is the best and surest way A free informational guide can be downloaded below. Warning, bat control is conceptually simple but practically speaking difficult to implement. Click her to find a qualified professional

a. check the time of year. Between May-Mid August, controlling bats by exclusion may result in the deaths of the young by preventing adults from returning to feed young.

b. close all the holes around your building with foam, caulk or 1/4 inch hardware cloth. (except the holes the bats use to leave the building) These holes can be identified by doing a bat watch at dusk or looking carefully for rub marks around holes or for droppings below the entrances (for more information, click here.)

c. over the bat exits, install a one way door or bat trap. This will allow the bats to fly out but not return. Since you closed all the other openings they can't fly into those spots either.

Order a one way door . For best service, e-mail your name address and phone number to and then call in your credit card number to 413-796-9916. You can also fax your information to 304-345-2448

Bat TrapYou can also use (if legal in your state) BAT Traps

12" Bat Trap

18" Bat Trap


d. don't think that if you build a bat house the bats will simply leave and enter the bat house (Click here to learn about Bat Behaviour.) However, if you would like information about bat houses click here .

Sound simple? It is. The problem is getting on the ladder and finding all those openings. Beware though. Even properly proofed houses may still cause spooked bats to fly into your living space until they all eventually leave.


a. Place lights in the attic. Be careful though they may simply go and live in the walls between the studs.

b. install an exhaust fan. Bats need hot temperatures to raise young. Installing an exhaust fan in the attic that turns on when the temperature gets too hot will help discourage bats from living in your home. Do this before the bats return from winter hibernation for best results. Also the fan temperature gauge should be set at 70 degrees F.

c. Mothballs can be irritating to bats but there are dangers to using them in your home. We DO NOT recommend them. Chances are to get bats out of the house with moth balls will require enough moth balls to drive you and your family out of the house too. Plus it is a potential fire hazard.

Free Guide

If you would like a copy of the Massachusetts Guide to Homeowners and Bats, (without paying for postage click here) otherwise, send a SASE manila envelope size 81/2x51/2 with one dollar's worth of postage to us. We do not sell this booklet. We provide it as a free service and we are grateful to the Mass. Div. of Fisheries and Wildlife for allowing us to make photo copies of the booklet.  Be assured that WDC does not sell mailing lists or customer information. At present we don't even do mailings or e-mailings, nor do we anticipate doing so in the foreseeable future.

Click here to learn more about bats

Click here to read about BAT HOUSE BASICS


Off-Line Ordering Information

While we encourage the use of our secure on-line ordering system. Click Secure. We understand how some of our customers have concerns with on-line credit card purchases prefer to pay with money orders etc. For those of you who wish not to use on-line ordering please follow the instructions below.

To determine the total cost of the purchase please follow these steps.

1. Click the purchase online link of the product you wish to purchase. (Don't worry you will cancel before the transaction is complete).

2. You will be taken to the Miva Secure Server. Put the number of the items you want in the Quantity form. Then Click Add to Basket. The page will reappear. Then click in the upper right hand corner "Checkout"

3. You will be asked if you want to create an account. Simply click "Place Order Without Account". Then type in whatever you want for your name, street address, phone number and e-mail. Just be sure that with your fake e-mail you set it up as The computer doesn't know if it is a real address or not. But it does recognize if it isn't set up properly.

4. Type in the correct City and State and Zip Code. This information is used by the computer to determine shipping costs.

5. Click "Continue". When you submit the information, (most of which is fake) you will be forwarded to a page that gives you options for shipping. In the shipping section, click the arrow. A form will come up that will list the prices of the various ways you can have the product shipped to you.

6. Click "Continue" and you will be forwarded to a page that will total the cost of the product and shipping. At this point, simply leave the site or turn off your browser. Note you have not put in your credit card number or even your full address. You can now send a money order to our address below. Or if you wanted to fax or call in your order, you will know what the total cost of the item(s) will be.


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Disclaimer: WDC seeks to provide accurate, effective and responsible information on resolving human/wildlife conflicts. We welcome suggestions, criticisms to help us achieve this goal. The information provided is for informational purposes only and users of the information use it at their own risk. The reader must consult state/federal officials to determine the legality of any technique in the reader's locale. Some techniques are dangerous to the user and to others. WDC encourages readers to obtain appropriate training (see our informational literature at our Store ), and understand that proper animal damage control involves patience, understanding that not every technique/method works for every situation or even 100% of the time. Your use of this information is governed by this understanding. We welcome potential users of the information and photos to simply ask for permission via e-mail. Finally, WDC welcomes e-mail but understand that all e-mails become property of Wildlife Damage Control.