Bat Removal in Ontario: What Homeowners Need to Know

Have bats in your GTA home? Get free quotes from licensed wildlife operators who handle bat removal legally.

Every summer, GTA homeowners discover they have bats in their attic or walls. The discovery usually comes from a bat seen flying through the house at night, or from a strong ammonia-like smell in the upper floors. Bats are a protected species in Ontario, which means you cannot simply eliminate them the way you would other wildlife. Getting them out requires a licensed operator and careful timing.

Ontario Bat Species

In the GTA, the most common bats found in homes are:

• Little brown myotis (Little Brown Bat): Once the most common bat in Ontario, now severely affected by white-nose syndrome. Still found in GTA homes.
• Big brown bat: More common than little brown bats in urban areas and more likely to roost in buildings. Less affected by white-nose syndrome.
• Northern myotis: Less common, also affected by white-nose syndrome.

The Legal Situation

All Ontario bats are protected under the Fish and Wildlife Conservation Act. This means:

• You cannot kill bats
• You cannot trap and relocate bats
• You cannot block access to a bat roost while bats are still inside
• Any bat removal must be done by a licensed wildlife control operator

The Maternity Season Problem

Ontario bats form maternity colonies in attics and wall voids in spring. Female bats gather in warm, sheltered spaces to give birth and raise their pups. The problem: baby bats (pups) cannot fly for about 3 weeks after birth. If you block the exit while pups are inside:

• The pups die in your attic or wall void
• Dead pups attract other wildlife and cause severe odour problems
• You are in violation of Ontario wildlife protection laws

Maternity season runs from approximately May 1 through August 31. During this window, a licensed operator can only install one-way doors if absolutely necessary, and must wait until the pups are old enough to fly before any exclusion is complete.

The Correct Removal Process

1. Inspection. A licensed operator identifies the bat species, locates the entry points, and estimates the colony size. Entry points are typically gaps in roof edges, soffits, roof vents, and eaves.
2. One-way door installation. One-way doors are installed over all identified entry points. These allow bats to exit but prevent them from returning. This is done outside maternity season, ideally in early fall.
3. Waiting period. All bats must be confirmed out before exclusion is sealed. This typically takes 1 to 3 nights.
4. Full exclusion sealing. All entry points are sealed permanently with galvanized steel mesh or hardware cloth. Every potential entry point on the building is sealed, not just the ones the bats were using.
5. Attic cleanup (if needed). Bat guano accumulates in the attic over time. If the colony was large, professional attic remediation may be needed.

Health Considerations

• Rabies: Bats can carry rabies. Any direct contact with a bat requires immediate medical attention. If you find a bat in your living space, do not handle it. Capture it in a container if possible without direct contact and call public health.
• Histoplasmosis: Bat droppings (guano) can harbour the fungus that causes histoplasmosis. Do not clean bat droppings yourself. Professional remediation is required.
• Allergens: Bat guano is a potent allergen. Attic remediation should include HEPA filtration and proper disposal.

Frequently Asked Questions

Are bats protected in Ontario?

Yes. All Ontario bat species are protected under the Fish and Wildlife Conservation Act. It is illegal to kill bats or disturb bat colonies without a licence.

Can bats be removed from my home in Ontario?

Yes, but it must be done legally. Licensed wildlife operators can remove bats using one-way doors. This can only be done outside the maternity season, which runs from May 1 to August 31.

When can bats legally be removed from GTA homes?

The recommended removal window is September 1 to April 30. During maternity season, blocking a bat exit traps flightless pups inside.

Are bats dangerous to have in my attic?

Bat guano can harbour a fungus that causes histoplasmosis. Bats can also carry rabies. Any potential rabies exposure requires immediate medical attention.

How much does bat removal cost in Ontario?

Bat removal runs $400 to $800 for a typical GTA home, depending on colony size, accessibility, and whether attic cleanup is needed.

Have bats in your GTA home? Get free quotes from licensed wildlife operators who handle bat removal legally and safely.