Cluster flies in Surrey are a common nuisance each autumn, when these insects gather in large numbers to hibernate in lofts, attics, and around window frames. While they do not spread disease in the same way as houseflies, they are unsightly, can stain walls, and often reappear in spring. This guide explains why cluster flies invade homes, how to prevent them, and when to call in professional pest control.
What Are Cluster Flies?
Cluster flies are slightly larger than houseflies and move more slowly. They are often found in groups, clinging to warm surfaces such as windows, roof beams, and sunny walls. In autumn, they look for quiet, sheltered spaces to overwinter, which is why lofts and roof voids are common hiding places.
Why They Appear in Autumn
Cluster flies are strongly seasonal. As the weather cools, they leave fields and gardens and move indoors to survive the winter. Surrey homes surrounded by fields, parks, or large gardens are particularly vulnerable. Once inside, cluster flies can gather in the hundreds, creating a frustrating problem for homeowners.
Signs of Cluster Flies in Your Home
- Groups of sluggish flies gathering around windows or loft spaces
- Buzzing noises in roof voids or attic areas
- Dark marks or staining left on walls and ceilings
- Repeated fly activity in the same spots each autumn
How to Prevent Cluster Flies
Prevention is the most effective approach. Consider these steps to make your home less inviting:
- Seal gaps and cracks around roof tiles, vents, soffits, and eaves.
- Install fine mesh on air vents and loft openings to allow airflow but block entry.
- Vacuum and clean regularly in unused rooms and loft spaces to spot early activity.
- Check windows and frames for small openings and repair damaged seals.
Safe Removal of Cluster Flies
Vacuuming can help control small numbers, but infestations usually return. Insect sprays or foggers may work temporarily, but they are not always effective and should be handled with care. Professional treatments target hidden harbourage areas and prevent repeat infestations across seasons.
When to Call Pest Control
If you are finding cluster flies every autumn, it is likely they have established regular overwintering sites in your property. Professional pest technicians use targeted treatments that reach the cracks and voids where flies hide. Go2 Pest Control provides expert flying insect control across Surrey and can stop infestations from recurring year after year.
Protect Your Surrey Home This Autumn
Cluster flies may be harmless, but their presence can quickly become overwhelming. By sealing entry points, improving maintenance, and booking a local inspection, you can enjoy an insect-free home this autumn. To arrange an inspection or treatment, visit our contact page today.