Bat Removal

Trained Bat Professionals

Bats are truly unique as they are the only mammal capable of flight and contrary to what most people believe, bats do have good eyesight. Canada has 19 species of bats, but only 2 species (little brown bat and big brown bat) commonly roost in attics, overhangs, porch areas and other parts of human dwellings. Bats can fit anywhere they can fit their head, so they can take advantage of small cracks and gaps in your home or building. Any area larger than penny is a potential entry point. To truly solve a bat problem in the safest and most humane way possible, the issue requires a trained professional with an understanding of bat habits and biology and a thorough building/home inspection and proofing.

Bat Problems in Hamilton

Each bat removal begins with a complete inspection of the building or home by one of our technicians. This will determine where the bats are entering. Once we have determined what needs to be done outside, a complete attic inspection is done to determine the size of the colony and the amount of guano in the attic. In some cases, the guano must be removed and the attic reinsulated. Often the size of the colony can&t be determined because the roost may be in a wall or some quality silicone. Larger gaps that cannot be caulked should be closed with fine steel screen. All roof/soffit intersections, roof vents, plumbing mats and chimney must be screened as well. In a situation where the roof or fascia gap is an issue, it will be screened or sealed with a steel drip guard. Once bat exclusion work is complete, we can begin the removal process.

Humanely Removing Bats

When performing a bat removal procedure, we need to be aware of what the bats are doing at that time of year. In winter for example, a complete removal is biologically impossible because the bats are hibernating. We can install bat one-doors at the time, but the doors must remain in place until at least mid-May when the bats are active. In summer we have a brief window that lasts until mid-June when the bats have their pups. Throughout the month of June and most of July we cannot install on-way doors because this will kill the bat pups that aren&t ready to leave the maternal colony. Bats do develop quickly and by the end of July, the majority of pups are foraging for insects outside. The months of August and September are peak months for bat activity – it is the simplest time to do removals. As the nights begin to cool towards mid-October, the bats will begin to hibernate. Again, we can install one-way doors at this point but they must remain on until the following spring.

Bat Related Concerns and Diseases

  • 3-5 % of bats found in homes test positive for rabies. Bats have very small teeth so bits may go undetected
  • Bat guano has been linked to histoplasmosis, a very serious lung infection
  • Bat guano raises moisture content in the attic, encouraging wood-rot
  • Bats can damage heating/cooling systems in the attic
  • Guano and urine builds up over time, causing odours and attracting insects

If you would like advice on choosing the correct solution for your Bat problem, please
call us at City Wildlife Control 905-963-0069 or email

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