House centipedes thrive indoors because your home offers exactly what they need: moisture, darkness, and a steady supply of other bugs to eat. Getting rid of them requires cutting off those resources, sealing the gaps they use to enter, and directly eliminating the ones already inside. The good news is that a few targeted changes can make your home far less hospitable to them.
Why They’re in Your Home
House centipedes are nocturnal predators that spend their days hiding in dark, damp spots and emerge at night to hunt. Their diet includes silverfish, firebrats, carpet beetle larvae, cockroaches, spiders, and other small insects. If you’re seeing centipedes regularly, it almost always means two things: your home has excess moisture somewhere, and there’s a population of prey insects feeding them.
That second point is worth sitting with. House centipedes don’t wander into your home looking for crumbs or leftovers. They follow other pests. A centipede problem is often a sign of a broader bug problem you may not have noticed yet.
Cut the Moisture First
Reducing indoor humidity is the single most effective long-term strategy. Centipedes need damp environments to survive, and a drier home becomes inhospitable to them quickly. Run a dehumidifier in basements, crawl spaces, and any rooms that feel persistently humid. Fix leaking pipes, dripping faucets, and any standing water issues. Make sure bathrooms and kitchens have functioning exhaust fans, and use them during and after showers or cooking.
Check less obvious moisture sources too. Condensation on basement walls, wet laundry left sitting, poor drainage around your foundation, and clogged gutters can all raise indoor humidity enough to keep centipedes comfortable. Improving ventilation in crawl spaces with proper venting or a vapor barrier makes a noticeable difference.
Seal Their Entry Points
House centipedes are flat-bodied and flexible enough to slip through remarkably small cracks. A systematic pass around your home’s exterior can block most of these pathways.
- Doors: Install door sweeps or thresholds at the base of all exterior doors. Lie on the floor and check for light filtering underneath. Even a gap of 1/16 inch is enough for insects to enter. Apply caulk along the bottom outside edge and sides of door thresholds. For garage doors, use a rubber bottom seal (vinyl performs poorly in cold weather).
- Windows: Caulk cracks around window frames using silicone or acrylic latex caulk. Latex types are easier to work with since they clean up with water and can be painted. Repair any torn or damaged window screens.
- Utility openings: Seal gaps where pipes, wires, outdoor faucets, gas meters, dryer vents, and cable lines enter the foundation or siding. These are some of the most common pest entry points. Use caulk, cement, expandable foam, steel wool, or copper mesh depending on the size of the gap.
- Sliding doors: Line the bottom track with half-inch to three-quarter-inch foam weatherstripping to close the gap beneath the door.
- Vents: Install quarter-inch wire mesh (hardware cloth) over attic, roof, and crawl space vents.
Clear-drying caulk is forgiving for beginners since mistakes are less visible than with pigmented varieties. Pay special attention to the bottom corners of doorways, as this is where insects most commonly enter.
Eliminate Their Food Supply
Because centipedes are predators, reducing their prey population removes their reason to stay. Address any existing pest issues in your home, whether that’s silverfish in the bathroom, cockroaches in the kitchen, or spiders in the basement. Declutter storage areas where prey insects tend to hide: cardboard boxes, stacked newspapers, and piles of clothing on the floor all provide habitat for the bugs centipedes eat.
Vacuuming regularly, especially along baseboards, in closets, and under furniture, removes both prey insects and their eggs. If you have a significant cockroach or silverfish problem, treating that issue directly will often cause centipede numbers to drop on their own.
Diatomaceous Earth for Direct Control
Food-grade diatomaceous earth (DE) is one of the more effective non-chemical options for killing house centipedes. It works physically rather than chemically: the microscopic sharp edges of the powder damage the centipede’s exoskeleton, causing it to lose moisture and die from dehydration. Because the mechanism is physical, pests cannot develop resistance to it.
Sprinkle DE in cracks, along door thresholds, in corners, and in damp areas where you’ve seen centipede activity. A few important guidelines: only use food-grade DE, never pool-grade. Apply it in dry areas only, since moisture renders it ineffective. Wear a mask during application to avoid inhaling the fine particles. Results take hours to days, not minutes, so give it time to work.
Residual Insecticide Sprays
If the infestation is persistent or widespread, residual insecticide sprays can create a barrier that kills centipedes on contact and continues working for days to weeks afterward. Products containing pyrethroids (such as bifenthrin, cyfluthrin, or permethrin) are commonly available at hardware stores and labeled for indoor use against crawling insects. Apply these along baseboards, in cracks, around door frames, and in basement corners where centipedes travel.
Follow label directions carefully, particularly regarding ventilation and keeping treated areas away from food preparation surfaces. Sticky traps placed along walls and in corners can also help monitor activity levels and catch individual centipedes, giving you a sense of how well your other efforts are working.
Are House Centipedes Dangerous?
Not really. House centipedes are technically venomous, but their bites are uncommon and almost always minor. They belong to the order Scutigeromorpha, described by entomologists as “fast but delicate.” A bite typically causes localized pain, some redness, and mild swelling that resolves within a few days. It’s comparable to a mild bee sting for most people.
Serious reactions are extremely rare. The venom would require the contents of roughly 1,000 venom glands to be fatal in an average adult, a scenario that’s essentially impossible from a single centipede. Occasional mild symptoms like headache, nausea, or dizziness have been reported after bites from larger centipede species, but house centipedes are small and rarely bite unless directly handled or trapped against skin.
Their appearance is far more alarming than any actual risk they pose. In fact, because they eat cockroaches, spiders, and other household pests, some entomologists consider them beneficial. That said, most people would rather not share a bathroom with a many-legged predator at 2 a.m., which is reason enough to take action.
A Practical Plan That Works
The most effective approach combines all of these strategies rather than relying on any single one. Start with moisture control and sealing entry points, since these address the root causes. Then apply diatomaceous earth or a residual spray in high-activity areas. Finally, tackle any underlying pest problems that are providing centipedes with food. Most people see a significant reduction within a few weeks of making these changes. If numbers don’t drop after a month of consistent effort, a pest control professional can assess whether there’s a moisture issue or hidden pest population you’ve missed.