Cluster Flies control in Canada
Fall invaders that pile up in attics and sunny windows.
How to identify it
Slightly larger than house flies, sluggish, with golden hairs; appear in large groups indoors.
Signs of an infestation
- Dozens of slow flies at sunny upstairs windows
- Dead flies collecting in attics and light fixtures
Is it dangerous?
Not a health risk, but large numbers are difficult to live with.
Can I handle this myself?
DIY is not recommended
Vacuuming helps only temporarily once they are inside a wall or attic.
When to call a professional
Call a professional for a preventive exterior treatment in late summer.
Any pesticide used in Canada must be registered here and applied exactly as its label directs. We don't publish application instructions.
Typical professional treatment
Exterior residual treatment before entry, attic void treatment and sealing.
Visits: 1 treatment, ideally in late August or September
How to keep them from coming back
- Seal soffit, attic vent and window gaps
- Treat the exterior before fall
- Screen attic vents
What cluster flies treatment costs
Typical treatment in your area
$200–$480
1 treatment, ideally in late August or September
Severe infestations, multi-unit buildings or multi-visit protocols can cost more. Estimates are illustrative sample data.
Get an exact local quote