Chances are you have seen a house centipede: a grayish-yellow, many-legged insect with long, floppy antennae that scuttles across the floor faster than most people can react. House centipedes (Scutigera coleoptrata) are easy to tell from other centipedes by their unusually long legs. The leg length changes the way they move, creating a rolling motion that makes them look as though they have many more legs than they actually do.
One sighting raises an obvious question: are there more, and how did they get in? House centipedes are drawn to darkness, dampness, and a supply of smaller insects to eat, so a sighting usually points to conditions worth fixing. The same moisture that supports an indoor centipede population can feed larger problems, and following a mold remediation plan for identification, removal, and prevention is a sensible first step when you find damp-related damage.
Identifying House Centipedes
Adult house centipedes reach roughly 1 to 1.5 inches long, not counting the legs, with a pale yellow-gray body marked by three dark stripes running down the back. Adults carry 15 pairs of legs, and the rear pair extends well past the body, which adds to the alarming silhouette. The antennae are nearly as long as the body and sweep constantly while the insect moves.
Distinguishing Features
Several features separate the house centipede from look-alike pests:
- Legs: long and banded, with the rear pair trailing noticeably past the body
- Body: pale gray-yellow with three dark stripes along the back
- Antennae: long, whip-like, and in constant motion
- Speed: fast runners that vanish into cracks within seconds
The rolling motion comes from the leg length itself. Each leg lifts and lands in sequence, and the wave travels down the body so quickly that the eye registers a blur rather than individual legs. That motion, plus the size, is usually enough to tell a house centipede from the other insects found indoors.
Where They Hide
House centipedes are nocturnal and prefer cool, damp, sheltered spots. Basements, bathrooms, laundry rooms, crawl spaces, and the areas around drains and sump pumps are the most common hiding places. During the day they tuck into cracks, under baseboards, and behind stored boxes, then emerge at night to hunt.
Damp basements attract them for the same reason they attract moisture problems. White, chalky deposits on concrete walls and floors, a condition known as efflorescence on concrete, are a reliable sign that water is moving through the masonry. Where you see it, you can expect the kind of damp microclimate that centipedes, and the insects they eat, tolerate well.
| Pest | Legs | Appearance | Typical Hiding Spot |
|---|---|---|---|
| House centipede | 15 pairs | Pale gray-yellow, dark bands | Damp basements, drains |
| Silverfish | None | Silver, tapered, scaled | Bathrooms, bookshelves |
| Cockroach | 6 | Brown, oval, flat | Kitchens, warm appliances |
| Spider | 8 | Varied by species | Corners, window frames |
Are House Centipedes Harmful?
For all the alarm they cause, house centipedes are not a serious threat to people or property. They are predators, and the insects they hunt are usually the ones homeowners want gone. A single centipede can consume a steady supply of smaller pests, which makes them a mixed blessing indoors.
Bites and Defensive Behavior
House centipedes can bite in self-defense, and the bite delivers a mild venom comparable to a bee sting for most people. They do not seek out humans, and bites are rare. When one does occur, the area may redden and swell slightly, then clear up on its own. Anyone with a known allergy should treat any bite conservatively and watch for a reaction.
What They Eat
Their diet is the main reason some people tolerate them:
- Cockroaches and their nymphs
- Silverfish and firebrats
- Spiders and mites
- Flies, moths, and small crickets
Because centipedes feed on other insects, a visible centipede population usually means another insect population is established somewhere in the building. Removing the food source is the most direct way to reduce centipedes, a point that matters again in the removal and prevention sections later in this article.
The link between pests and home-buying decisions is real. People shopping for a house increasingly factor pest work into their budgets, and surveys show that homeowners now prioritise saving up for removal costs ahead of stamp duty and estate agent fees when moving house. A pest inspection before closing can flag an established centipede or insect problem before it becomes your problem.
Five Ways to Remove House Centipedes
A light infestation does not require fumigation. These five methods, used in combination, will clear most homes:
- Sticky traps: place glue boards along baseboards, behind appliances, and in corners where you have seen activity. Traps also reveal which other insects are present.
- Vacuuming: suck up any centipede you see on sight. Seal the bag or canister contents before disposal so nothing climbs back out.
- Residual sprays: use an insecticide labeled for centipedes and apply it to baseboards, cracks, and other runways. Follow the label and keep children and pets away until dry.
- Diatomaceous earth: dust a thin layer into wall voids and behind fixtures. The abrasive particles damage the insect exoskeleton as it passes through.
- Professional treatment: for a heavy or recurring infestation, a licensed pest control operator can apply barrier treatments you cannot buy over the counter.
Sticky Traps and Monitoring
Glue boards do double duty. They catch centipedes, and the insects stuck to them tell you what the centipedes have been eating. Check traps weekly and replace them when the adhesive is covered or dusty. A trap that keeps refilling means the underlying insect problem is still active.
Chemical and Natural Options
Residual sprays give the fastest knockdown, but they only treat the surfaces they touch. Diatomaceous earth works more slowly and needs to stay dry to remain effective, which limits where you can use it. Boric acid powder, used the same way, is another low-toxicity option for cracks and voids.
Dispose of Captured Insects Carefully
Whatever method you use, dispose of captured insects outside the house. Empty vacuum canisters into a sealed bag, and take glue boards directly to an outdoor bin. Releasing or discarding them indoors simply moves the problem to another room.
Removal works best when it runs alongside general pest exclusion. Keeping flying insects out of a building follows the same screening and sealing logic covered in the proven house fly prevention techniques for building sites and homes, and fewer flies means less food for the centipedes that hunt them.
Preventing House Centipedes
Prevention targets the three things centipedes need: moisture, food, and places to hide. Remove any one of them and the population shrinks; remove all three and they stop coming inside.
Reduce Moisture
Fix leaking pipes and dripping faucets, redirect downspouts away from the foundation, and ventilate bathrooms and laundry rooms. A dehumidifier in a damp basement makes a measurable difference, because centipedes lose moisture quickly in dry air. Target indoor humidity below 50 percent where you can.
Seal Entry Points
Centipedes are small and flat; they slip through gaps that look insignificant. Walk the perimeter of the house and close off every route from outside:
Where to Focus Your Sealing
- Cracks in the foundation and basement walls
- Gaps around pipes, wires, and vents that pass through exterior walls
- Weatherstripping under exterior doors and around windows
- Torn screens on windows, vents, and crawl-space openings
The same sealing work keeps out larger pests. Rodent control depends on the same kinds of exclusion, and the effective home removal and prevention methods described for mice start with closing the gaps that let animals in. Sealing for mice, then sealing for centipedes, is often the same job done once.
Clear Clutter
Centipedes hide in cardboard boxes, paper piles, and firewood stored indoors. Store off-season items in sealed plastic bins, keep boxes off the floor, and move firewood outdoors. Clearing clutter also exposes the insects, so you notice a problem sooner rather than later.
Maintaining a Centipede-Free Home
Once the house is dry, sealed, and decluttered, the work becomes routine. A short inspection on a seasonal schedule catches new entry points and moisture problems before they support another population.
Seasonal Checks
- Spring: inspect the foundation after thaw and look for new cracks
- Summer: check window and door screens for tears
- Fall: clear leaves and debris away from the foundation before wet weather
- Winter: watch basement humidity and keep vents clear
A walk around the house twice a year, plus a glance at the basement dehumidifier setting, is enough for most homes.
Door and Window Entry Points
Doors deserve a second look because they are the most used openings in the building. The same gaps that undermine a door’s security are exactly where small pests enter, and guides that catalog entry methods and prevention strategies for getting back into a locked house emphasize how often doors are compromised through thresholds and frames. Weatherstripping and door sweeps close both problems at once.
When to Call a Professional
If centipedes keep appearing after the house is dry and sealed, or if you find them in large numbers in wall voids and crawl spaces, a professional can locate the harborage and apply treatments in areas you cannot reach. Ask for a written plan that includes sealing recommendations, not just spraying.
When you do catch one indoors, the handling is simple: trap it under a cup, slide a piece of paper underneath, and carry it outside. The same capture-and-release principle behind the humane removal steps used to get a bird out of your house applies here, and once the animal is out, seal the spot it came from.