Inspect:
- Door thresholds
- Window seals
- Foundation cracks
- Gaps where pipes enter the house
If slugs are entering repeatedly, they’ve likely found a reliable path in.
What to do: Seal cracks with caulk, repair weather stripping, and make sure doors close tightly.
3. Outdoor Conditions May Be Pushing Them In

Heavy rain, flooding, or extreme humidity outside often forces slugs to seek shelter indoors. If your yard or garden holds too much water, slugs may migrate toward your house.
Things to check outside:
- Overwatered plants near walls
- Mulch piled against the foundation
- Dense vegetation touching the house
- Poor drainage around the home
What to do: Improve drainage, move mulch away from walls, and trim plants so they don’t touch the structure.
