The short version
Spider control focuses on removing webs, sealing entry points, and treating hiding spots. For black widows or brown recluses, professional treatment is essential to ensure family safety.
- Only black widow and brown recluse spiders pose medical risks in the US.
- Most household spiders are harmless and help control pests like flies and mosquitoes.
- Professional treatments cost $150–$400 and include interior/exterior applications.
- DIY methods are limited; professionals use residual sprays and sealing techniques.
- Prevention tips: seal cracks, reduce clutter, and remove outdoor debris.
- Research: Living rooms are nearly as spider-prone as basements: Bertone and colleagues found spiders in 96.9% of 97 common areas across 50 North Carolina homes in 2012.
For homeowners, renters, landlords, and anyone concerned about spiders in their living space—especially families with young children or pets who may be curious about spiders.
What to look for
Once inside, they reproduce quickly; a single egg sac can contain hundreds of spiderlings. While most species are harmless, the presence of spiders causes anxiety and can lead to bites, especially in areas where children or pets may disturb them. Spiders enter homes for food, shelter, and warmth. They prey on insects, so any home with other pests (ants, flies, mosquitoes) is attractive. Cracks in foundations, gaps around windows and doors, and open vents provide easy access.
- 1Visible webs in corners, ceilings, or outdoor eaves.
- 2Egg sacs (round, silken balls) attached to surfaces.
- 3Live spiders seen frequently, especially at night.
- 4Shed skins (exuviae) near hiding spots.
- 5Small insects caught in webs, indicating a food source.
- 6Bite marks or unexplained welts on family members or pets.
- 7Droppings (small dark specks) near webs or hiding spots.
Why it’s worth acting soon
- Spider populations can grow rapidly once established.
- Increased risk of bites, especially from venomous species.
- Fear and stress for family members, particularly children.
- Damage to furniture or fabrics from webbing and droppings.
- Potential allergic reactions to spider venom in sensitive individuals.
in the U.S. are the black widow and brown recluseMedically significant spidersUS CDC Treatment options and typical costs
Interior/Exterior Residual Spray
$150–$300
Professional application of liquid insecticides to baseboards, cracks, windowsills, and exterior perimeter. Creates a barrier that kills spiders on contact and provides long-lasting residual protection.
- Time
- Lasts 3–6 months
- Best for
- General spider prevention and control in homes with moderate activity.
Dust Treatment for Attics and Crawlspaces
$200–$400
Application of insecticidal dust into voids, attics, and crawlspaces where spiders hide. Dust particles adhere to spiders and are carried back to nests.
- Time
- Lasts 6–12 months
- Best for
- Homes with heavy spider infestations or inaccessible areas.
Web Removal and Sealing gaps
$100–$250 (add-on)
Physical removal of webs and egg sacs combined with sealing entry points (cracks, gaps) using caulk or steel wool. Often included with other treatments.
- Time
- Ongoing; webs must be removed regularly
- Best for
- Immediate relief and long-term prevention.
Prices are typical published ranges. Ask what’s included before you compare quotes.
The gap under a door is one of the easiest ways in, for spiders and for the insects they follow.Understanding Venomous Spiders: Black Widow and Brown Recluse.
Black widows are found throughout the US, but are most common in the south and west. In the United States, only two groups of spiders are considered medically significant: the black widow (Latrodectus) and the brown recluse (Loxosceles). Professional control can reduce risk by removing spiders from living areas. For families with children, it's important to teach them not to disturb spiders and to seek medical attention if bitten. However, bites are rare and most occur when spiders are accidentally pressed against skin. Bites from these spiders can cause severe pain, necrosis (brown recluse), or systemic symptoms (black widow). They have a violin-shaped mark on the back of the cephalothorax and six eyes arranged in three pairs—unlike most spiders which have eight eyes. Brown recluses are concentrated in the central and southern states, from Nebraska to Texas and east to Georgia. They are shiny black with a red hourglass marking on the underside of the abdomen.
Why Spiders Invade Homes in Fall.
This is when male spiders leave their webs to search for mates, often wandering into homes. The peak season for spider sightings is late summer through fall (August–October). Remember, most spiders you see in fall are harmless—but it's smart to be cautious until species is identified. If you already see spiders, a professional treatment can knock down the population quickly. To minimize fall invasions, focus on sealing gaps: seal entry points before September. Homes with outdoor lights that attract insects are especially vulnerable. Additionally, insect prey (like flies and mosquitoes) may also move indoors, following food sources. Cracks and gaps become highways for these eight-legged wanderers. As temperatures drop, spiders also seek warmth and shelter indoors.
Stacked boxes against a garage wall are a favorite hiding spot; check them before you move them.Safe spider control for Families with Pets.
Ask your technician about pet-safe options. Professional pest control companies use products that are safe for pets once dry, but they should always be applied away from pet areas. Many over-the-counter sprays contain pyrethroids that are toxic to cats and fish. If you have pets, especially cats and dogs that might eat spiders, chemical control must be handled carefully. For ongoing prevention, consider quarterly professional treatments that target spider hiding spots without exposing your pets to chemicals. your veterinarian immediately if you suspect a venomous spider bite. If your pet is bitten by a spider, monitor for swelling, pain, or lethargy; black widow bites can be dangerous for small animals. Non-chemical measures like sealing cracks, vacuuming, and sticky traps are also effective and pose no risk.
What affects the price
- Size of the home (square footage).
- Severity of infestation (number of spiders, egg sacs).
- Type of treatment (spray, dust, sealing gaps).
- Number of treatments needed (single vs. quarterly service).
- Geographic location (regional pricing differences).
- Accessibility of infested areas (attics, crawlspaces).
- Presence of venomous species requiring special handling.
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What is your biggest concern about spiders in your home?
When to call for help
Call a professional if you suspect black widow or brown recluse spiders, if you have a severe infestation (multiple webs or egg sacs daily), if family members have had allergic reactions to spider bites, or if DIY methods have failed. Professionals have access to stronger, longer-lasting products and can safely treat hard-to-reach areas.
What you can do yourself
DIY spider control—like vacuuming webs, using sticky traps, or over-the-counter sprays—can reduce populations temporarily. However, these methods rarely address the root cause: hiding spots and entry points. Professional treatments use residual insecticides that kill spiders for months, and technicians are trained to identify and seal entry points. For families with children and pets, professional application is safer because products are applied in targeted areas away from living spaces. The cost ($150–$400) is often worth the long-term relief.
Where you live matters
The Midwest and South see brown recluses in attics, closets, and basements; their range extends from Nebraska to Georgia. In the Southwest and California, black widows are frequent in garages, woodpiles, and outdoor structures. In the Pacific Northwest, giant house spiders (Eratigena atrica) are common but harmless; they can be alarming due to their size. Spider species and prevalence vary across the US. Always consult a local expert who understands your area's spider ecology. For example, treatments for brown recluse focus on voids and clutter, while black widow control targets outdoor hiding spots. Regardless of region, professional control should be tailored to local species. In the Northeast, common house spiders (Parasteatoda tepidariorum) and cellar spiders (Pholcidae) dominate indoors.
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 on windows and vents.
- Reduce outdoor lighting that attracts insects; use yellow bug lights instead.
- Keep firewood, mulch, and debris away from the house foundation.
- Declutter basements, attics, and garages to eliminate hiding spots.
- Vacuum regularly, especially in corners and under furniture.
- Remove webs and egg sacs with a broom or vacuum; dispose of them outdoors.
Spiders found in a bathtub or vanity usually wandered in from a gap behind the plumbing, not up the drain.Did you know?
Weight for weight, spider silk is stronger than steel.
Spiders can't chew. They liquefy a meal first and drink it.
Jumping spiders can leap many times their own body length.
Questions people ask
Are most spiders in my home dangerous?
Only two groups in the US—black widows and brown recluses—are medically significant. Most household spiders are harmless and actually help control pests like flies and mosquitoes. No.
How do I know if I have a brown recluse?
They are most common in the central and southern US. If you suspect one, avoid direct contact and call a professional. Brown recluses are light to medium brown with a dark violin-shaped mark on their back and six eyes in three pairs.
What should I do if my child is bitten by a spider?
Clean the bite with soap and water, apply a cold compress, and monitor for symptoms like pain, swelling, redness, or fever. If you suspect a black widow or brown recluse bite, seek medical attention immediately.
How often should I get professional spider control?
Quarterly treatments (every 3 months) are recommended for ongoing prevention. A single treatment may suffice for minor issues, but regular service ensures long-term control.
Can I treat spiders myself?
However, professional treatments are more effective for persistent or venomous spiders. DIY sprays often lack residual power. Yes, for minor problems. Vacuum webs, use sticky traps, and seal cracks.
Do pest control products harm pets?
Keep pets away during application and until surfaces dry. Vacuuming and sealing gaps are non-toxic alternatives. Professional products are safe once dry, but always ask your technician to use pet-friendly options.
Why do I see more spiders in fall?
Male spiders wander to find mates, and both sexes seek warmth indoors as temperatures drop. This leads to increased sightings from August through October.
What attracts spiders to my home?
Outdoor lights attract insects, which in turn attract spiders. Reducing insect populations and sealing entry points helps. Food (other insects), shelter (clutter, cracks), and warmth.
Was it really a spider bite?
If a sore is spreading, warm or draining, treat it as a possible infection and see a doctor rather than assuming a spider. Treat it as a rough guide, not a local count. Probably not. In Suchard's study of 182 patients who came to one California emergency department with a suspected spider bite between January 2006 and November 2007, published in 2011, only 3.8% were diagnosed as spider bites, while 85.7% were diagnosed as infections, most often skin infections.
What does a severe spider infestation cost to treat?
Ask whether follow-up visits and a sealing step are part of the price. It's a published estimate, not a local quote. Local quotes vary; ask for a written estimate. Severe cases usually involve more than one visit and exterior work.
Sources (11)
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