Cockroaches — why they're there and how to actually get rid of them

This article is for educational purposes only and is not a substitute for professional advice. Local codes, regulations, and best practices vary by region.

You saw a cockroach. In your house. Not outside. Inside. If you saw one during the day, you have an infestation. Cockroaches are primarily nocturnal and hide during daylight. Seeing one during the day means they’ve become so numerous that some are out even when they should be hiding. This is the moment to take action decisively. Cockroaches aren’t minor annoyances. They’re a serious problem. But they’re manageable if you’re aggressive and systematic.

Cockroaches are attracted to food, water, and shelter. They hide in cracks and crevices during the day and come out at night to forage. They thrive in warm, humid environments with access to food. Kitchens are their ideal habitat. Bathrooms are secondary homes. They hide behind and under appliances, in wall cavities, under baseboards, in cupboards—anywhere dark and protected.

Signs of infestation beyond seeing actual cockroaches include dark droppings that look like ground pepper scattered in cabinets and corners, a musty or oily odor, and shed skins left as roaches molt. These signs appear before or alongside visible roaches.

Start with an aggressive cleaning. Remove all food sources. Clean out every cupboard. Wipe down all surfaces. Vacuum thoroughly, especially under and behind appliances. Remove clutter where roaches hide. Take out garbage daily and don’t leave it in the house overnight. Seal food in containers. Dry sinks before bed. Roaches need water. A damp environment with water access supports them. Fix leaky pipes immediately. Run exhaust fans to reduce humidity.

The most effective treatment is gel baits. These are small containers filled with slow-acting poison mixed with food attractants. Place them behind appliances, under sinks, in dark corners, under cabinet shelving—anywhere you’ve seen roaches or where they hide. The roaches eat the bait and die, but more importantly, they carry poison back to their hiding spots where other roaches consume it. This distributed effect is what makes baits effective against infestations. Place baits, follow the instructions, and give them time. Treatment typically takes 2 to 4 weeks.

Boric acid is another option. Roaches walk through boric acid powder and then groom themselves, ingesting the poison. Boric acid is very effective but it’s toxic to humans and pets. If you have children or pets, it’s not safe. If you use it, apply it only in inaccessible areas like inside wall voids or deep behind appliances where roaches hide but people and pets won’t encounter it. Wear gloves when handling it. Never use it on surfaces where food is prepared.

Combine treatments for better effect. Use gel baits in accessible areas and boric acid in inaccessible areas. Maintain aggressive cleaning. Reduce moisture. Continue treatment consistently for 3 to 4 weeks even if you stop seeing roaches. Many roaches will be hidden in walls and crevices. Don’t stop early.

If DIY treatment doesn’t produce results after 4 weeks, or if you’re uncomfortable using these methods, call a professional. Pest control companies specializing in cockroaches have stronger treatments and expertise in finding hiding spots. Professional treatment typically requires 2 to 3 visits over several weeks and costs $500 to $1,500. For severe infestations, professional treatment is worth the cost because it’s guaranteed to work.

The prevention rules are simple. Keep your kitchen scrupulously clean. Don’t leave food out. Seal food in containers. Take garbage out daily. Fix plumbing leaks. Run exhaust fans to reduce humidity. Seal cracks and crevices. Keep clutter to a minimum. These actions prevent re-infestation after treatment.

Cockroaches in your house is stressful. It feels unclean and invading. But cockroaches don’t discriminate by cleanliness. They thrive in filthy homes and also invade clean ones. They’re successful creatures that exploit food and shelter wherever they find it. Getting infested doesn’t mean you’re a bad housekeeper. Getting rid of them means being aggressive and systematic.

Don’t panic but don’t wait either. Cockroach infestations get worse with time. The earlier you address them, the easier they are to eliminate. Use baits, clean thoroughly, reduce moisture, and be patient while treatment works. If you hit them hard from multiple angles—gel baits, cleaning, moisture reduction, caulking—you’ll eliminate them.

© The Whole Home Guide