A handful of home remedies can genuinely reduce spider activity indoors, though none will eliminate every species equally. The most effective approach combines repellents like peppermint oil or vinegar sprays with physical barriers and habitat changes that make your home less inviting to spiders and the insects they feed on.
Peppermint Oil and Other Essential Oils
Peppermint oil is the most widely recommended natural spider repellent, and it does have some science behind it. Researchers at the University of Ulm and the University of Toronto tested the top three substances cited online as spider repellents: peppermint oil, lemon oil, and chestnuts. Two of the three spider species tested avoided peppermint oil in more than 75 percent of trials. Lemon oil, by contrast, had no measurable effect on any of the species.
To use peppermint oil as a repellent, mix 10 to 15 drops into a spray bottle filled with water, adding a small squirt of dish soap to help the oil blend. Spray along windowsills, doorframes, baseboards, and any corners where you’ve noticed webs. The scent fades within a few days, so you’ll need to reapply at least once a week. Tea tree oil and eucalyptus oil are sometimes suggested as alternatives, though they have less research behind them.
One important caveat: peppermint oil, eucalyptus oil, tea tree oil, and citrus oils are all toxic to cats. Cats lack a liver enzyme needed to metabolize these compounds, and exposure can cause drooling, vomiting, tremors, respiratory distress, and in severe cases liver failure. The higher the concentration, the greater the risk. If you have cats, skip essential oil sprays entirely. Dogs are less sensitive but can still be affected by concentrated oils, so keep sprayed areas out of reach.
White Vinegar Spray
A vinegar spray is one of the simplest remedies to make and works through direct contact rather than scent alone. The acetic acid in white vinegar irritates and harms spiders on contact. Mix equal parts white vinegar and water in a spray bottle, then apply it directly to spiders, webs, or areas where spiders tend to gather: corners, cabinets, closets, and cracks in walls or floors.
Vinegar won’t leave a lasting residual barrier the way a chemical pesticide would. Its value is more as a spot treatment and mild deterrent. The smell dissipates within an hour or two, so it needs frequent reapplication to maintain any repellent effect. It’s pet-safe once dry and won’t damage most surfaces, though you should avoid spraying it on natural stone countertops or hardwood floors, since the acid can etch or dull finishes over time.
Diatomaceous Earth
Food-grade diatomaceous earth (DE) is a fine powder made from fossilized algae. Under a microscope, the particles have razor-sharp edges that cut into a spider’s outer shell, causing it to lose moisture and die from dehydration. It also absorbs the oils and fats from the exoskeleton, speeding up the process. Unlike sprays that rely on scent, DE requires physical contact to work, so placement matters.
Sprinkle a thin, barely visible layer along baseboards, in wall voids, around outlets, inside closets, in storage areas, and in basements. A thin application is actually more effective than a heavy one because spiders are more likely to walk through a light dusting than avoid a visible pile. For tight spaces, a powder duster makes application easier. Leave it in place for about a week, then vacuum it up and reapply if you’re still seeing activity. DE stays effective indefinitely as long as it remains dry; moisture renders it useless.
Wear a dust mask and gloves when applying and cleaning up diatomaceous earth. The particles aren’t chemically toxic, but inhaling the fine dust can irritate your lungs and airways. Make sure you buy the food-grade version, not the pool-grade type, which is heat-treated and far more hazardous to breathe.
Chestnuts: Partially Backed by Science
The old folk remedy of placing horse chestnuts (conkers) on windowsills and in corners has a partial basis in research. In the same University of Ulm study that tested peppermint oil, chestnuts repelled two of the three spider species in more than 75 percent of trials. One species, however, was completely unaffected. So while chestnuts aren’t a myth, they’re not reliable against all spiders. If you want to try them, split or score the chestnuts to release more of their scent compounds and replace them every few weeks as they dry out.
Sticky Traps for Monitoring and Catching
Flat sticky traps (also called glue boards) won’t stop an infestation on their own, but they’re useful for catching wandering spiders and figuring out where the problem is worst. Brown recluse spiders in particular are readily caught on sticky traps because they roam at night rather than sitting in webs.
Place traps flat against walls with the open ends running parallel to the baseboard, since spiders and insects prefer to travel along edges in dark areas. Good locations include along garage walls, behind furniture, in storage rooms, and inside closets. Space them 5 to 10 feet apart in areas where you suspect activity. Check them weekly. The traps will show you which rooms have the heaviest traffic, helping you target your other remedies more effectively.
Prevention That Actually Reduces Spiders
Spiders go where the food is. Every home remedy works better when you also reduce the insect populations that draw spiders indoors in the first place.
Outdoor lighting is one of the biggest attractors. Bright porch lights pull in flying insects, and spiders set up webs nearby to feast. Switching to yellow sodium vapor bulbs or motion-sensor lights cuts down on the insect buffet significantly. Indoors, drawing blinds or curtains at night reduces the amount of light that spills outside and attracts bugs toward your windows.
Sealing entry points is the single most impactful physical change you can make. Inspect the gaps around windows, doors, pipes, and your home’s foundation, then seal cracks with caulk or weatherstripping. Check window and door screens for tears. If you have a fireplace, a chimney cap prevents spiders and other creatures from entering through the flue. Store firewood well away from your home’s foundation, since woodpiles are prime spider habitat.
Clutter gives spiders undisturbed places to hide and breed. Attics, basements, garages, and storage rooms are the most common problem areas. Keeping these spaces organized and vacuuming them regularly removes both spiders and their egg sacs. Indoor plants can also contribute to the problem by attracting the small insects spiders eat. If you keep plants indoors, inspect them for pests, avoid overwatering (which creates the moist conditions insects love), and keep them away from entry points like doors and windows.
Finally, basic housekeeping makes a difference: store all food, including pet food, in airtight containers, clean up spills immediately, and take out trash regularly. Fewer crumbs mean fewer ants and flies, which means fewer spiders following their food source into your home.
When Home Remedies Aren’t Enough
Most house spiders are harmless and even beneficial, eating mosquitoes, flies, and other pests. But a few species pose real health risks: black widows, brown recluses, yellow sac spiders, and hobo spiders all have bites that require medical attention. If you’re finding these species on sticky traps, seeing them regularly, or discovering them in clothing, bedding, or shoes, home remedies alone are unlikely to solve the problem.
To check for a serious infestation, use a flashlight to inspect corners, edges, light fixtures, window frames, and the undersides of cabinets and furniture. Outdoors, check along the foundation, inside electrical boxes, and in irrigation valve covers. Wear gloves during these inspections. If you’re consistently finding venomous spiders or large numbers of any species despite using the remedies above, professional pest control can treat wall voids, attic spaces, and other areas that are difficult to reach with DIY methods.