Seeing spiders indoors doesn't mean you have an infestation. Almost every house has some, and most of them are harmless and stay out of sight. What changes the picture is evidence that spiders are living and breeding inside in numbers. This guide shows which spiders researchers actually find in Carolina homes, the signs that point to a real spider problem, the ones that look alarming but aren't, and what works to bring the numbers down.
Some spiders are normal. When NC State researchers searched 50 homes around Raleigh, every single one had cobweb spiders, and 84% had cellar spiders.
Signs of a real infestation: webs that come back within days of cleaning, egg sacs, clusters of tiny spiderlings, spiders in the same spots every day, and plenty of other insects for them to eat. A few large spiders wandering in during late summer or fall are usually visitors, not an infestation. For most homes, the fix is vacuuming, sealing gaps and cutting down the insects spiders feed on. The University of California's IPM program says pesticides "are not generally needed."
Which Spiders Live in Carolina Homes
In the first survey of its kind, NC State researchers collected every arthropod they could find in 50 homes in and around Raleigh. Spiders were everywhere, but the common pest species were outnumbered by harmless ones.
| Spider family | Share of homes | What you'd notice |
|---|---|---|
| Cobweb spiders, including the common house spider | 100% | Tangled webs in corners, windows and under furniture |
| Cellar spiders | 84% | Long, thin legs and loose, messy webs on ceilings and in basements |
| Jumping spiders | 50% | Small, fuzzy hunters on walls and windowsills, no web |
| Wolf spiders | 40% | Large, fast hunters on floors, often in fall |
| Crab spiders | 32% | Usually carried in on plants or flowers |
| Wall spiders | 28% | Tiny flat webs on walls and ceilings |
So the useful question isn't "do I have spiders?" It's "are they breeding here in numbers?" The signs below help you tell the difference.
7 Signs of a Spider Infestation
1. Webs that come back within days
One web in a corner is normal. Webs that reappear in the same corners, windows and ceiling edges a few days after you clear them mean spiders are living there and rebuilding. The University of California's IPM program describes the common house spider making its cobweb "in corners of rooms, in windows, and in similar places," and cellar spiders causing problems mainly by "producing messy cobwebs."
2. Egg sacs
Egg sacs are the strongest single sign. A common house spider's sac is a small, round, brownish ball of silk hanging in or near her web, and its eggs hatch in about a week at room temperature. If you find one, look for the female nearby. In a Reddit spider forum (via Google search excerpts), one reply to a photo of a house spider guarding her sacs was simply: "She's there with her egg sacs. Harmless pest control."
A black widow's egg sac is different: round, about half an inch across, creamy yellow to light tan and tough and papery, according to UC IPM. Widow sacs are usually in dark, undisturbed spots like garages, sheds, meter boxes and woodpiles.
3. Clusters of tiny spiders
A swarm of pinhead-sized spiders on a wall or in a corner means a sac has just hatched. Finding them more than once points to breeding. See how long spider eggs take to hatch for what to expect by species.
4. Spiders in the same places every day
Seeing a spider occasionally is normal. Seeing them daily in the same room, window or corner suggests an established population close by.
5. Plenty of other insects
Spiders go where the food is. A renter on Reddit who described spiders "in every corner between wall and floor" also noticed "a lot of little bugs" that the spiders were likely eating. UC IPM points out that good window and door screening keeps out spiders and "the insects they prey on." If you have gnats, flies, ants or roaches, fix that first and the spiders often follow.
6. Shed skins and insect remains
Spiders molt as they grow. Small papery skins and dried insect parts collecting under webs show spiders have been living and feeding in that spot for a while.
7. Spiders in cluttered, quiet spaces
Basements, garages, closets, crawl spaces and boxes that rarely get moved give spiders shelter. See where spiders hide, room by room. UC IPM notes spiders also get carried in on plants, firewood and boxes. Heavy webbing in storage areas is common and easy to clear.
What Usually Isn't an Infestation
- A few big spiders in late summer or fall. The Burke Museum explains that the seasonal surge in August and September is mostly mature males wandering in search of mates. Clemson notes wolf spiders may wander into homes before winter. These are visitors, and they rarely breed indoors.
- Spiders seen out in the open during the day. UC IPM says spiders in the open during the day are unlikely to bite.
- A "spider bite." Many wounds blamed on spiders are something else. In one study, 29% of patients with confirmed MRSA skin infections thought a spider had bitten them. A sore that spreads, swells or doesn't heal needs a doctor, not a spider hunt.
- A "brown recluse" in coastal South Carolina. The brown recluse is not established in the Lowcountry. In a study of 1,061 suspected recluses sent in by Georgia residents, only 1.8% were actually brown recluses. In coastal South Carolina, most suspected recluses turn out to be wolf spiders or southern house spiders. See brown recluse vs. black widow in South Carolina.
What Actually Gets Rid of a Spider Problem
- Vacuum webs, spiders and egg sacs. UC IPM says vacuuming is effective because spiders' soft bodies usually don't survive it. Empty or seal the vacuum bag afterward.
- Seal the way in. Caulk cracks in the foundation and gaps around windows, doors and pipes, and repair torn screens.
- Cut their food supply. Fix the gnat, fly, ant or roach problem. Switching exterior lights to yellow bulbs or motion sensors draws fewer night insects to the doors.
- Declutter storage areas. Get boxes off the floor, use sealed plastic bins and clear debris away from the foundation.
- Skip the spray as a first step. UC IPM says spraying is "only temporary unless accompanied by housekeeping," and pesticides "are not generally needed" for most spiders.
Popular natural remedies are mixed. In a 2025 lab study of essential oils, peppermint, lavender and eucalyptus had no effect on wolf spiders. See which plants and oils actually repel spiders.
When to Call a Professional
- You're finding widow spiders in living areas, play areas or anywhere kids reach
- Webs and spiders keep coming back after weeks of vacuuming and sealing
- You keep finding egg sacs or spiderlings indoors
- There's a larger insect problem feeding the spiders
- Someone in the home has a spider phobia and needs it handled
Spiders are covered under every Vinx residential plan, with seasonal treatments, web removal and an exterior barrier treatment. See our spider control service for South Carolina, North Carolina and Virginia. For why spider numbers jump at certain times of year, see why you see more spiders indoors in September.
Key Takeaways
- Every home has some spiders. NC State found cobweb spiders in all 50 Raleigh homes it surveyed.
- Infestation signs: webs that rebuild fast, egg sacs, spiderlings, daily sightings in the same spots, and lots of other insects.
- Big fall spiders are usually visitors, mostly males looking for mates.
- Most "spider bites" aren't, and the brown recluse isn't established in the SC Lowcountry.
- Vacuum, seal and cut their food. Pesticides are rarely needed for spiders.
Frequently Asked Questions
Webs that come back within days of clearing them, egg sacs, clusters of tiny spiderlings, spiders in the same spots every day, shed skins and insect remains under webs, and plenty of other insects for spiders to eat. Seeing an occasional spider is normal.
Yes. When NC State researchers surveyed 50 homes around Raleigh, cobweb spiders turned up in every one, and cellar spiders in 84%. Most indoor spiders are harmless and help control other insects.
There is no single number, but nearly every home has some. In the NC State survey, cobweb spiders were found in 65% of all rooms sampled. A spider problem is about numbers and breeding, not whether a few are present.
Usually one of three things: it's late summer or fall and mature males are wandering in looking for mates, there are plenty of insects for spiders to eat, or spiders are breeding indoors. Egg sacs and spiderlings point to breeding.
A common house spider's sac is a small, round, brownish silk ball hanging in or near her web, and the eggs hatch in about a week at room temperature. A black widow's sac is round, about half an inch across, creamy yellow to light tan and tough and papery.
Usually not. The Burke Museum says the late-summer surge is mostly mature males wandering in search of mates, and Clemson notes wolf spiders may wander indoors before winter. These visitors rarely breed inside.
Vacuum spiders, webs and egg sacs, seal cracks and gaps around windows, doors and pipes, repair screens, reduce the insects spiders feed on, and declutter storage areas. UC IPM says pesticides are not generally needed for most spiders and spraying alone is only temporary.
In coastal South Carolina, rarely. The brown recluse is not established in the Lowcountry, and most spiders people think are recluses turn out to be wolf spiders or southern house spiders. If you're unsure, trap the spider and have it identified.
Call if you're finding widow spiders where people or kids spend time, if webs and spiders keep returning after weeks of vacuuming and sealing, if you keep finding egg sacs or spiderlings indoors, or if a larger insect problem is feeding them.
Sources: M. A. Bertone, M. Leong, K. M. Bayless, T. L. F. Malow, R. R. Dunn and M. D. Trautwein, "Arthropods of the great indoors: characterizing diversity inside urban and suburban homes", PeerJ 4:e1582 (2016); UC IPM, Pest Notes: Spiders, Publication 7442; R. Crawford, Burke Museum, "Myth: Spiders come into houses in the fall to get out of the cold"; Clemson Cooperative Extension HGIC 2450, Wolf Spiders; G. J. Moran et al., "Methicillin-Resistant S. aureus Infections among Patients in the Emergency Department", New England Journal of Medicine 355:666 (2006); R. S. Vetter, N. C. Hinkle and L. M. Ames, "Distribution of the Brown Recluse Spider in Georgia with Comparison to Poison Center Reports of Envenomations", Journal of Medical Entomology 46:15 (2009); I. L. Frithsen, R. S. Vetter and I. C. Stocks, "Reports of Envenomation by Brown Recluse Spiders Exceed Verified Specimens of Loxosceles Spiders in South Carolina", Journal of the American Board of Family Medicine 20 (2007); M. Chajduk et al., "Repellent effect of selected essential oils against the wolf spider Pardosa hortensis", Behavioural Processes (2025); homeowner and renter accounts from Reddit (via Google search excerpts).
Photo credits: Richhoyer99, CC BY 3.0, via Wikimedia Commons; Cor2ran, CC0.