The short version
Most household spiders are harmless, but black widows and brown recluses pose risks. Look for webs, egg sacs, and live spiders. Professional treatment costs $150–$400 and includes interior and exterior spraying.
- Only black widows and brown recluses are medically significant in the US.
- Spider activity peaks in late summer through fall when males seek mates.
- Professional treatment costs $150–$400 and typically includes a workmanship warranty.
- Prevention focuses on sealing entry points and reducing prey insects.
- a no-charge inspection is available from spider control; call
- Research: Across 50 North Carolina homes inspected in 2012, Bertone and colleagues found spiders in 68.5% of the 146 bathrooms, the lowest room-level share in their study.
We'll help you decide whether DIY methods are sufficient or if professional treatment is the safer choice. This guide is for homeowners, families with children or pets, and landlords who want to protect their property from spider infestations. If you've noticed an increase in spiders, found egg sacs, or live in an area where black widows or brown recluses are common, this information is for you.
What to look for
However, bites are rare, and most spiders are harmless. Their bites can cause necrotic wounds or systemic symptoms. Brown recluses are concentrated in the central and southern states, from Nebraska to Texas and eastward to Georgia. Black widows are found nationwide but are more common in the South and West. In the US, only two groups are medically significant: black widows and brown recluses. While most spiders are beneficial predators that control insects like flies and mosquitoes, their webs and presence can be a nuisance. During this period, you're more likely to encounter spiders in basements, garages, and corners of rooms. Spiders become most visible in late summer through fall (August–October) as males roam to mate and seek warmth indoors.
- 1Frequent spider sightings, especially in corners, closets, or undisturbed areas.
- 2Webs that accumulate dust or contain prey remains.
- 3Egg sacs—small, round, silk-covered pouches attached to surfaces.
- 4Small piles of dead insects near webs.
- 5Scratches or bite marks on skin (rare, but possible with black widows or recluses).
- 6Presence of other insects like flies or ants, which attract spiders.
- 7Shed spider skins or molts in hidden areas.
Why it’s worth acting soon
- Population growth: A single egg sac can contain hundreds of spiderlings.
- Increased nuisance: More webs and spiders in living spaces.
- Bite risk: Though rare, venomous spiders can cause medical issues.
- Damage to reputation: For landlords, visible spiders can lower tenant satisfaction.
- Prey attraction: Spiders indicate an underlying insect problem that may worsen.
in the U.S. are the black widow and brown recluseMedically significant spidersUS CDC Treatment options and typical costs
Interior & Exterior Chemical Spray
$150–$400
A professional-grade liquid insecticide applied to baseboards, corners, windows, door frames, and exterior perimeter. Creates a barrier that kills spiders on contact and provides residual protection.
- Time
- Lasts 1–3 months; repeat every 3 months recommended.
- Best for
- General spider control for most homes; active infestations.
Dust & Granular Treatments
$100–$200
Silica gel or diatomaceous earth dust applied into wall voids, attics, and crawl spaces. Granules are spread on outdoor soil or mulch to target ground-dwelling spiders.
- Time
- Lasts several months if undisturbed.
- Best for
- Crawl spaces, attics, and areas where sprays are not suitable.
Web Removal & Gap Sealing
$75–$150
Physical removal of webs and egg sacs using a brush or vacuum, combined with sealing cracks and gaps around the home. Often included with professional service.
- Time
- Immediate but requires ongoing prevention.
- Best for
- Homes with visible webs but low spider activity.
Glue Traps & Monitors
$10–$30 per pack
Non-toxic sticky traps placed along baseboards and in corners to capture spiders and monitor activity. Used for inspection or as a removal method.
- Time
- Replace monthly or when full.
- Best for
- Detecting infestations, monitoring after treatment, or light infestations.
Prices are typical published ranges. Ask what’s included before you compare quotes.
Lidded plastic bins beat open boxes and loose piles for keeping spiders out of stored clothes and bedding.Understanding Spider Behavior & Peak Season.
Spiders are arthropods that belong to the class Arachnida. They have eight legs, two body segments, and no antennae. Most species are solitary and cannibalistic. They rely on vibrations and vision to detect prey. Their life cycle includes egg, spiderling, and adult stages; some species live for only one year, while others, like tarantulas, can live for decades. Web-building spiders create intricate structures to catch flying insects. Common examples include orb weavers, cobweb spiders, and funnel weavers. Hunting spiders, like wolf spiders and jumping spiders, actively chase prey. Knowing the type of spider can help determine the best control strategy. Spiders are most active from August to October, when males leave their webs to search for mates. This is why you see more spiders indoors during fall—they wander in from outside. Females typically stay hidden in webs or burrows. Understanding this seasonal pattern helps in timing preventive treatments.
Medically Significant Spiders: Black Widow & Brown Recluse.
Brown recluses (Loxosceles reclusa) are tan with a violin-shaped mark on their back. They are reclusive and prefer dry, warm environments like attics, closets, and cardboard boxes. Their venom can cause necrotic skin lesions that take months to heal. They are primarily found in the central and southern US, from Nebraska to Texas, east to Georgia, and north to Ohio. The CDC notes that brown recluses are not established on the West Coast or in most northeastern states. Misidentification is common. Many harmless spiders are mistaken for brown recluses. If you suspect a brown recluse, capture the spider (if safe) for identification. pest control pros can confirm and treat accordingly. Black widows (Latrodectus spp.) are shiny black with a red hourglass on the underside. They build irregular, messy webs in dark, undisturbed areas like woodpiles, sheds, and garages. Their venom is neurotoxic and can cause muscle cramps, nausea, and difficulty breathing. Bites are rarely fatal but require medical attention.
The gap under a door is one of the easiest ways in, for spiders and for the insects they follow.Integrated Pest Management (IPM) for Spiders.
Start by removing webs and egg sacs with a vacuum or broom, then find the entry points and seal them. Reduce hiding spots by clearing clutter in basements, garages and attics. Outdoors, keep the yard tidy and move woodpiles away from the house. Use yellow or warm-toned bulbs to draw fewer insects. If treatment is still needed, a pro can put a light dust into voids and treat the exterior perimeter rather than spraying rooms. IPM keeps product use low while still keeping spiders in check. Integrated pest management for spiders combines cleanup, sealing gaps and targeted treatment.
What affects the price
- Home size and number of stories (larger homes cost more).
- Severity of infestation (heavy webs or multiple species).
- Type of treatment (spray vs. dust vs. sealing gaps).
- Geographic region (prices vary; urban areas may be higher).
- Frequency of service (one-time vs. quarterly plans).
- Accessibility (crawl spaces, attics, high ceilings require extra labor).
- workmanship warranty included (some companies charge more for warranties).
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What's your biggest concern about spiders in your home?
When to call for help
Professionals have access to stronger insecticides, can identify and treat hidden hiding spots, and often offer a warranty. Ask about treatment and maintenance options. If you see black widows or brown recluses, or if spider activity is widespread and DIY methods haven't worked, it's time to call a professional.
What you can do yourself
Professional treatments use targeted products and equipment, ensuring longer-lasting results. For venomous spiders or large infestations, professional help is strongly recommended due to safety and efficacy. For minor spider issues, DIY methods like glue traps, sealing cracks, and reducing clutter can be effective. However, DIY sprays available.stores are often less potent and may not reach hidden areas.
Where you live matters
If you live in the central or southern states, be vigilant for brown recluses in attics, closets, and storage areas. In the Southwest, black widows thrive in outdoor structures like sheds and garages. In northern states, spiders often enter homes seeking warmth as temperatures drop, so focus on sealing gaps and door sweeps before winter. Regardless of region, the key is to address spider-friendly conditions: moisture, clutter, and insects. Regional pest control companies can tailor treatments to local spider species and seasonal patterns. Spider populations vary across the US. In the South, black widows and brown recluses are more common, and warm, humid climates support year-round spider activity. In the Northeast, house spiders and cellar spiders are typical, with peak activity in fall. The West Coast has black widows but few brown recluses; wolf spiders are frequent in Pacific Northwest homes.
Simple ways to keep spiders away
- Seal cracks and gaps around windows, doors, and foundations with caulk or weatherstripping.
- Install door sweeps and repair torn screens.
- Reduce outdoor lighting near doors; use yellow or sodium vapor lights to attract fewer insects.
- Keep basements, attics, and garages clutter-free and clean.
- Store firewood at least 20 feet from the house and off the ground.
- Trim bushes and trees away from the house to prevent spider bridges.
- Vacuum regularly, especially corners and under furniture.
Compare quotes on what they include: web removal, treatment, sealing and any follow-up visit.Did you know?
Weight for weight, spider silk is stronger than steel.
Spiders can't chew. They liquefy a meal first and drink it.
There are over 3,000 species of spiders in North America, but only a handful are considered pests.
Questions people ask
What attracts spiders to my home?
Spiders are attracted to homes that offer shelter, moisture, and food (insects). Cracks in foundations, open windows, outdoor lights that attract insects, and cluttered spaces all invite spiders.
Are most spiders dangerous?
Only two groups in the US—black widows and brown recluses—are medically significant. Most spiders are harmless and even beneficial because they eat other pests. No.
How often should I have my home treated for spiders?
If you have an active infestation, monthly treatments may be needed initially. Many companies offer workmanship warranties that include follow-up treatment (ask what is included) between scheduled visits. For ongoing prevention, quarterly treatments are recommended.
Can I get rid of spiders myself?
Glue traps, vacuuming, sealing cracks, and reducing clutter can help. But for venomous species or heavy infestations, professional treatment is safer and more effective. For minor issues, yes.
What does a professional spider treatment involve?
A technician will inspect inside and out, identify problem areas, apply insecticide to baseboards, corners, and exteriors, and remove webs and egg sacs. They may also use dusts in voids and recommend sealing repairs.
How long does treatment last?
Dust treatments can last several months. Regular maintenance is key to long-term control. Residual sprays typically last 1–3 months, depending on the product and conditions.
Is spider treatment safe for children and pets?
Technicians use low-toxicity sprays and avoid treating surfaces children or pets contact directly. Always follow the technician's safety advice, such as keeping pets away until the spray dries. Professional products are EPA-approved and applied with safety in mind.
How much does spider extermination cost?
In Spider Inspection, most spiders are harmless and beneficial, so the goal is usually to remove the webs and egg sacs and reduce the insects they feed on. In Spider Inspection, only the black widow and brown recluse are medically significant in the U.S., and they are identified by their markings.
Is it normal to find spiders in your bedroom?
When Bertone and colleagues inspected 50 volunteer homes in North Carolina in 2012, they found spiders in 75.6% of the 160 bedrooms they searched, only slightly below the rate for kitchens and living areas. An occasional spider is not a reason for treatment; repeated sightings, webs in multiple corners, or bites are the signals to investigate further. Yes.
Sources (12)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Spider Exterminator · Updated September 11, 2026 · How we write these guides