Finding slugs inside your home can be unsettling. They move silently, leave slimy trails, and often appear at night when everything is quiet. While slugs are harmless creatures, their presence indoors is never random. If slugs keep visiting your house, it’s important to check a few key things right away — not because of bad luck, but because your home may be sending you a warning.

1. Excess Moisture Is the Main Reason

Slugs are highly attracted to moist, damp environments. If you’re seeing them indoors, your home may have hidden moisture problems.

Check for:

• Leaking pipes under sinks
• Damp basements or crawl spaces
• Condensation around windows
• Wet floors in bathrooms or laundry rooms

Even small, unnoticed leaks can create the perfect conditions for slugs. Over time, excess moisture can also lead to mold, mildew, and structural damage — problems far more serious than the slugs themselves.

What to do: Fix leaks immediately, use a dehumidifier, and improve ventilation in damp areas.

2. Cracks and Entry Points You May Be Overlooking

Slugs don’t need large openings to get inside. They can squeeze through tiny cracks, gaps under doors, or spaces around window frames.

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: