If you found 3 cockroaches in your house, you should take immediate action to inspect, clean, and treat because 3 visible roaches often indicate many more hidden, especially if they are German cockroaches, and early intervention prevents heavy infestation. First, identify species, German cockroaches are small light brown about half an inch with two dark stripes common in kitchens and bathrooms and indicate indoor breeding, while American cockroaches are large reddish brown about one and a half inches often called palmetto bugs that may wander in from outdoors. Second, conduct thorough inspection at night with flashlight to find hiding spots, look for droppings that look like black pepper, egg cases, and check under sinks, behind refrigerators, stoves, dishwashers, inside cabinets, and in wall voids near pipes, plus place sticky traps to monitor activity. Third, implement intense sanitation to remove food, water, and shelter, store all food in sealed glass or metal containers, clean crumbs, grease, and spills daily from countertops and under appliances, take out trash, fix leaks, dry sinks, and remove cardboard and clutter where roaches hide. Fourth, seal cracks and crevices with caulk around windows, doors, pipes, and baseboards to prevent spread. Fifth, apply gel baits containing fipronil, hydramethylnon, or indoxacarb such as Advion or Maxforce in small dots near droppings and hiding spots, allowing roaches to eat bait and carry it back to kill colony within days to weeks, avoiding repellent sprays that cause scattering. If roaches are German or you see droppings, consider professional pest control costing $150 to $300 for inspection and treatment with warranty.
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