Bat roosting on rough brick under soffit overhang in Castle Rock, CO

Bats are an important part of Colorado’s robust ecosystem as they help control many nuisance insect populations. Unfortunately, in urban areas such as the Denver Metro, they often roost inside the attic spaces of homes or businesses. With their presence can come unpleasant odors, disruptive noises and ectoparasitic bugs. The goal of humane bat control is to safely remove bats from a structure, prevent future entry and keep bats living outside where they belong!

CALL 303-683-9283 to schedule your inspection with one of our NWCOA Certified Bat Specialists TODAY! 

Our team of bat experts is skilled at identifying bat concerns and offering personalized solutions to your situation – whether you need bat removal, bat entry point repair or bat clean up services.


Little Brown Bats and Big Brown Bats are the most active species within the Denver Metro Area. They are usually present from late Spring-Fall before hibernating in the high country during the winter months. The bats can often be seen at dusk leaving their roosting points to start their nightly feeding routine.

If bats are living inside of a structure, occupants often hear the fluttering of wings or high pitch chitter/screeching. Keeping a close eye on the structure at dusk can allow homeowners to identify where the bats are exiting the structure.

Bat guano is another telltale sign of bat activity. If bats are roosting along the exterior of a structure, guano is typically found along the edge of the wall or directly under a porch overhang. Sometimes there will also be staining on the siding below the roosting point. Bat guano can vary in shape and size depending on the age and diet of the bat, but most droppings are approx. 1/4-1/2 inch with blunt ends. Guano is typically dry, crumbly and often contains a lot of insect parts.

If an entire bat colony is living inside of a structure, occupants may start smelling the guano. It typically has a strong ammonia smell – much like a litter box.


As stated above, homeowners can identify where bats are exiting the structure by watching them leave around dusk. However the observed exit point may not be the only vulnerable area on the structure. If you work to seal one location without sealing all vulnerable areas, the bats may simply take advantage of a different opening. Therefore it is very important to begin with a thorough inspection of the entire structure. It is ideal to have this inspection performed by a wildlife professional who specializes in bat removal and entry point repair. Untrained or inexperienced inspectors may miss common bat entry points or assume that a gap is too small to allow access.

Did you know? Bats can enter through a 1/4″ width gap. That’s the diameter of a pencil head!

Whitmore Pest & Wildlife Control inspectors will check the exterior perimeter of the structure – paying special attention to roof-lines, soffit areas, decorative beams, attic ventilation and chimney chases as these are just a few common spots where bats may roost or gain access to an attic space. Our inspectors will also assess the interior of the attic space for bat activity and the presence of ectoparasitic bugs. After a thorough inspection, our inspectors and homeowners alike will have a better understanding of what is necessary to remove the bats and keep them out!


Once bat activity and bat entry points have been identified, the actual bat removal process can begin. Types of repairs and length of the project can vary greatly from one structure to another but bat removal should always follow this framework.

  1. All vulnerable bat entry/roosting points must be repaired using high quality construction materials.
  2. Bat removal devices must be installed over active bat entry points to allow bats to exit the structure.
    • If a maternal bat colony is identified, bat removal devices cannot be installed until bat pups can fly.
    • Bat removal devices may not be necessary if bats have already left the summer roost for hibernacula.
    • Bat removal devices may not be effective if bats are overwintering in the structure and have already entered hibernation.
  3. Bat removal devices must be uninstalled after the bats have left the structure and the remaining bat entry points must be sealed.
  4. After the bats are removed, an ectoparasitic bug treatment should be applied to minimize their migration into the living space.
  5. Guano remediation can be done if odor concerns are present. Health and safety of guano removal should be discussed with your inspector before moving forward.