What does bat exclusion mean?
Exclusion means keeping bats from re-entering a structure after they leave. Michigan DNR describes non-lethal one-way exclusion as an approach for bats in buildings. It is different from simply filling an opening while bats may still be inside.
The method and timing for a particular home need a property-specific assessment. This website does not promise that a particular device or procedure will be used. Ask the specialist to explain the proposed approach and its limitations.
Michigan’s maternity period matters
Michigan DNR advises avoiding exclusion during the maternity period, typically May through mid-August, because young bats may not yet be able to fly. Bats are protected in Michigan.
A date on the calendar alone does not establish that work is appropriate. Timing can depend on young bats, seasonal activity, the structure, and applicable rules. Ask what can be assessed now and what work may need to wait.
Questions to ask before agreeing to work
A clear proposal should make it easy to understand what is being recommended. Consider asking:
- What evidence shows bats are using the structure?
- What makes the proposed timing appropriate for this situation?
- How will remaining bat activity be assessed?
- Which entry areas and repairs are included in the scope?
- Are any follow-up checks recommended, and what do they cover?
Keep exclusion and cleanup decisions separate
Closing access and addressing material left in an attic are different tasks. If droppings are present, ask whether cleanup assessment is needed and whether that work is offered. Do not assume it is included in an exclusion proposal.
For help with bat exclusion questions in Grand Rapids, call and describe the activity you have noticed. Availability, scope, and scheduling must be confirmed with the specialist.