Stink Bug Control
Brown marmorated stink bugs (BMSB) are an invasive species that first appeared in Pennsylvania in the late 1990s and have since spread to most US states. They don't bite, don't sting, and don't damage structures — but every fall they swarm into homes by the hundreds or thousands looking for overwintering harborage, then emerge gradually through the winter and spring, crawling along walls and windowsills. Squashing them releases the cilantro-like defensive odor they're named for. Eastern and Midwestern states with cold winters see the worst invasions.
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Signs you have a stink bugs problem
- Shield-shaped brown bugs on south- and west-facing exterior walls in October
- Bugs clustering around window screens, attic vents and gable louvers in fall
- Slow-moving bugs appearing indoors on warm winter days, especially near windows
- A distinctive cilantro or coriander smell when crushed
- Bug activity inside light fixtures, behind window blinds or in attic spaces during winter
- Mass emergence in spring as bugs leave overwintering sites and try to get back outdoors
Why stink bugs are a serious problem
- Significant nuisance — large invasions disrupt daily life and stain walls and curtains when crushed
- Allergic reactions — some people develop mild allergic reactions to stink bug defensive secretions
- Agricultural damage — stink bugs are a major pest of tree fruit, vegetables and field crops
- Long-lasting odor — crushed bugs leave a smell that can persist for hours
- Mass emergence — properties not treated in fall can have a second wave inside in March/April
Why DIY stink bugs treatment usually fails
Once stink bugs are inside the walls of a home, indoor pesticide spraying is essentially useless and often counterproductive — dead bugs in wall voids attract carpet beetles and other secondary pests. Effective stink bug control is preventive: an exterior residual application in late September before the bugs aggregate, combined with sealing every gap around windows, vents, soffits and utility penetrations. DIY exterior sprays usually miss the timing window and don't cover the high reaches where bugs land first.
The reality: Most homeowners who try DIY end up calling a pro anyway, after spending $50–$200 on hardware-store products and several weeks of failed attempts. The math almost always favors calling a licensed contractor up front.
What a professional stink bugs treatment looks like
Licensed contractors time the exterior treatment to the local fall aggregation cycle (typically late September to mid-October), use a labeled residual product like a pyrethroid that holds on siding for several weeks, and treat soffits, gable vents and attic louvers — the entry points stink bugs use most. A pre-fall sealing inspection is often included.
What it costs
Pricing varies by infestation severity, property size, and location, but most homeowners can expect quotes in the range described in the FAQ below. The contractor will give you an exact, no-obligation quote during the initial call.
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Frequently Asked Questions
Are stink bugs dangerous to people or pets?
No. Stink bugs don't bite, sting or transmit disease. They are purely a nuisance pest, though heavy invasions can be very disruptive.
Why are stink bugs in my house in winter?
They entered in the fall to overwinter and have been hiding in wall voids, attics or attic insulation. They re-emerge on warm winter days or in the spring when temperatures rise.
Can I just vacuum them up?
Yes — vacuuming is the recommended way to remove indoor stink bugs because it doesn't release the defensive odor. Empty the vacuum canister or bag outside immediately or seal it in a plastic bag, because they'll keep producing the smell inside the vacuum.
How much does stink bug treatment cost?
Most fall stink bug exterior treatments run $200–$400 for a single-family home. Larger homes or homes in heavy invasion zones (the Mid-Atlantic, especially) often run higher.
When is the best time to treat for stink bugs?
Late September through mid-October — before the bugs aggregate on exterior walls but after summer heat has subsided enough for residuals to hold. Spring treatments are largely ineffective because the bugs are already inside the structure.