Autumn sealing and exterior treatment
The best-value service. It combines roofline repair with a perimeter application in the weeks when insects are gathering. It reduces the number that get in and set up the winter population.
Serving Hennepin County
Cluster Fly and Stink Bug Control in Minneapolis
Attic and wall-void insects that wake on warm winter days: brown marmorated stink bugs, cluster flies and their autumn entry.
- Phones answered 24/7
- Autumn sealing before the hard freeze
- Price confirmed before treatment
Get a fast quote
Fastest: call (855) 974-4733. Or send this and we call you back.
Cluster Flies & Stink Bugs
Cluster Fly and Stink Bug Control: what it covers
Quick answer
Brown marmorated stink bugs and cluster flies spend the winter in attics and wall voids, then crawl toward windows on warm days. In Minneapolis the fix is sealing the roofline and walls in autumn, not spraying rooms in January. Minneapolis Pest Control connects you with a local technician and confirms the price first.
Open the attic hatch on a mild February afternoon and you may hear it: a low, droning buzz from the dark corner under the roof. Slow, fat flies or shield-shaped brown bugs have woken inside the insulation, and they are crawling toward the light.
These are the quieter members of the autumn invasion. University of Minnesota Extension describes brown marmorated stink bugs as the newest on its list of home invaders, alongside boxelder bugs and Asian lady beetles. Cluster flies behave in a similar way, and also end up in attics and walls over winter. Our page on boxelder bugs and lady beetles covers the first two. This page handles the other two, and the strategy that works for both. Minneapolis Pest Control passes your call to an independent local company; phones are answered 24/7.
- Service area
- Minneapolis & Hennepin County
- Availability
- Phones answered 24/7
- Phone
- (855) 974-4733
Warning signs
Signs you need cluster fly and stink bug control
Do not use foggers or aerosol sprays in an attic or wall void, and do not climb into a tight attic without a light and a helper. Chemical mist can drift into living areas, and attics have weak joists and exposed wiring.
- Shield-shaped, mottled brown bugs on a window, curtain or the inside of a screen
- Slow, sluggish flies bumping into upstairs windows on a sunny winter day
- A droning sound from an attic, soffit or inside a wall on a warm afternoon
- Piles of dead flies on windowsills in rooms under the roof
- Bugs clustered on a sunny outside wall or around a window frame in autumn
- A sharp, unpleasant odor when a stink bug is crushed or vacuumed
- Dark specks of waste on the wall beside a light fixture or a window
- Insects appearing from a recessed light or an access panel
Our process
How our cluster fly and stink bug control visit works
Sort out which insect it is
Stink bugs and cluster flies need different sealing and have different habits. The technician identifies the species from the insects and from where they appear.
Inspect the roofline and attic
Gaps at soffits, ridge vents, fascia, chimneys and attic louvers are checked. These are the places the insects use to reach the dry, sheltered space under the roof.
Close the openings
Screens, caulk and flashing are repaired where the technician finds an opening. Windows and door frames are checked as well, because adults also enter there.
Treat the exterior where it counts
If insects are gathering on walls in autumn, a residual product may be applied around openings and sunny surfaces. The technician explains timing, because applications after insects are inside do little.
Advise on the indoor wake-ups
A vacuum is the practical tool for the winter. The technician explains what to expect, where the insects will come from and when to call back.
Cost
How much does cluster fly and stink bug control cost in Minneapolis?
No Minneapolis price for this service was found in published sources, so none is shown. The quote depends on the following.
| Job | Typical range | What it includes |
|---|---|---|
| Roofline complexity | Scales with the house | Multi-gabled roofs, dormers and tall chimneys take longer than a simple ranch roof |
| Access to the attic | Depends on access | A walk-up attic is simple; a tight crawl hatch with limited headroom takes more time |
| Number of openings | Set by condition | Old soffits and worn screens are common finds |
| Exterior treatment | Optional | Applied only when insects are gathering and timing is right |
| Roofing or carpentry repair | Referred out | Rotted fascia or failed flashing may need a contractor |
These are cost drivers, not prices. Your exact price is confirmed on site before any work starts.
Why are the stink bugs and flies in my attic?
They seek dry, sheltered gaps to wait out the cold. Attics and wall voids are warm in the sun and sheltered from wind and snow. University of Minnesota Extension notes that autumn invaders get under shingles and into wall voids and attics in numbers.
From the insect's point of view, a house is a cliff face with cracks in it. The upper part of the house holds warmth after dark and is mostly undisturbed.
Cluster flies tend to gather in the same upper spaces and are drawn to the same sunny walls. The pattern is more about the building than about your housekeeping.
Is a stink bug dangerous or will it damage the house?
No. They do not bite, sting or damage wood. The nuisance is the odor they release when disturbed and the numbers that can build in an attic. Extension includes the species with the common home invaders, which are mostly a matter of persistence.
The smell is a defense. Crushing one on a curtain or wall leaves a lingering odor, so vacuum or scoop them into a container instead.
If you grow fruit or vegetables, stink bugs can be a garden pest in summer. That is a separate issue from the overwintering insects in your house.
What should I do on a warm day in January?
Vacuum the visible insects with a hose attachment and empty the bag outside. Do not spray the room. Extension notes that warm spells wake some overwintered insects indoors and that those insects die within days without food, so a vacuum is enough.
The warm-day wake-up is a short event. It looks worse than it is, and it ends when the weather turns cold again.
If the insects keep appearing in one room, note the room and the position of the window or fixture. It tells the technician where the entry is.
When should I schedule the seal-up?
Late summer through early autumn is best, before the insects gather on warm walls. After they have gone indoors, treatment is limited to vacuuming and light sealing. Spring is the second best window, since exits can be closed once insects have left.
Plan for a visit when the first cold nights arrive. That is when the roofline and window frames matter most.
A walk around the house in August with binoculars can reveal gaps at the soffit or ridge before you need to call.
How is this different from the boxelder bug and lady beetle problem?
Boxelder bugs and lady beetles gather on outside walls in autumn and mostly wake on warm days. Stink bugs and cluster flies share that overwintering habit but favor the upper parts of the house, so the work is in the roofline and attic, not at the foundation or the basement.
A basement sealing job aims at ground-level gaps for rodents. An attic-side job aims at gaps overhead, where ladders, flashing and roof pitch change what can be done safely.
Because the species overlap, one autumn visit often covers more than one of them. Ask the technician to list which insects the plan is aimed at, and which it is not.
Options
Types and options for cluster fly and stink bug control
Attic and wall-void inspection
For homes that already see insects every winter. The technician finds the colony or aggregation in the attic or wall and recommends sealing. Treating inside a void is done with care and only when the technician judges it appropriate.
Spring exit sealing
At the thaw the insects leave. A visit then closes the exit points, which are often the same as the entries. It prepares the house before the next autumn.
Hennepin County
Why cluster fly and stink bug control is different in Twin Cities Metro
Minnesota winters are long enough that the insects wake up in the walls more than once. A warm afternoon in the middle of the winter is followed by a hard freeze, and insects that wandered toward a window can end up dead in the light fixtures.
The older housing in the city often has attic spaces with original soffits and louvers and many generations of repairs. Those transitions are where insects find a way in.
Brick and stone buildings with south and west faces hold the afternoon sun. Garages and porches attached to the main house can give insects another route, and an unheated porch can fill with insects in a day.
Heating bills push many Twin Cities households to add attic insulation, which makes a deeper, warmer layer for insects to settle in. If you have added insulation recently, ask the technician to check that the soffit vents are still open and screened, because blocked vents can lead to damp and make a shelter more attractive.
One call and it gets handled.
Most cluster fly and stink bug control calls are scheduled the same day when a technician is free, and you approve the price before any work starts.
Where we work
Cluster Fly and Stink Bug Control across Hennepin County
- Cluster Flies & Stink Bugs in Minneapolis
- Cluster Flies & Stink Bugs in Saint Paul
- Cluster Flies & Stink Bugs in Mendota
- Cluster Flies & Stink Bugs in Hopkins
- Cluster Flies & Stink Bugs in Navarre
- Cluster Flies & Stink Bugs in Minnetonka
- Cluster Flies & Stink Bugs in Loretto
- Cluster Flies & Stink Bugs in Osseo
- Cluster Flies & Stink Bugs in South Saint Paul
- Cluster Flies & Stink Bugs in Eden Prairie
- Cluster Flies & Stink Bugs in Circle Pines
- Cluster Flies & Stink Bugs in Wayzata
- Cluster Flies & Stink Bugs in Inver Grove Heights
- Cluster Flies & Stink Bugs in Champlin
- Cluster Flies & Stink Bugs in Newport
- Cluster Flies & Stink Bugs in Maple Plain
- Cluster Flies & Stink Bugs in Chanhassen
- Cluster Flies & Stink Bugs in Crystal Bay
- Cluster Flies & Stink Bugs in Savage
- Cluster Flies & Stink Bugs in Long Lake
Not sure if you're covered? Check your ZIP code.
Related
Related services
Boxelder Bug and Asian Lady Beetle Control
Boxelder bugs and Asian lady beetles gather on sunny walls in fall, get inside and wake on warm winter days.
General Pest Control
Seasonal pest control for Twin Cities homes, timed to the October move indoors and the April thaw instead of spread evenly.
Basement and Foundation Sealing
Sealing rim joists, sill plates, window wells and utility gaps in Twin Cities basements before the ground freezes.
Guides
Read before you book
Boxelder Bugs and Asian Lady Beetles on Your Minnesota Home
Boxelder bugs and Asian lady beetles gather on sunny walls each autumn looking for a place to spend the winter.
FAQ
Cluster Fly and Stink Bug Control FAQs
Do cluster flies and stink bugs infest food?
No. They do not breed in the house or contaminate stored food. They are overwintering insects that came to the building for shelter. Seal the gaps, vacuum the ones you see and keep the attic access closed.
Why do I see flies in an upstairs room only?
Overwintering flies and bugs gather under the roof and head toward light and warmth when they wake. Upstairs rooms are closest to the attic. They find the way down through light fixtures, vents and gaps around pipes.
Will pest control stop them in the winter?
Spraying inside is rarely useful. Extension notes that the insects die without food after a warm-day wake-up. The effective steps are sealing in autumn and vacuuming in winter. A technician can advise which one applies to your house.
Is the brown marmorated stink bug new to Minnesota?
Extension lists it as the newest of the home invaders, after boxelder bugs and Asian lady beetles. A technician can identify which species you have from a specimen, which helps decide what to do.
Should I vacuum or squash stink bugs?
Vacuum or sweep them into a container. Squashing releases a smell that lingers. Empty the bag outside straight away, because the odor can come from the vacuum as well. A soapy jar of water also works for a few.
Can I fix the roofline myself?
Small jobs such as replacing a screen or caulking a seam are within reach if you can work safely at height. Roof work is dangerous in winter and wet weather. A technician or roofer can handle the high repairs. For work above the first floor, many homeowners prefer to hire it out.