13/10/2026
Pest of the month for October
October Pest of the Month: Cluster Flies
Finding flies in your loft or gathering around upstairs windows? Our October Pest of the Month is the cluster fly.
For homeowners and businesses in Somerset, Dorset and Devon, knowing which fly you are dealing with is the first step towards choosing the right response. Smyth Pest Control offers local advice and pest control with over 25 years of experience.
Why do cluster flies appear in autumn?
Cluster flies spend much of the warmer year outdoors. As temperatures fall, adults seek sheltered places to overwinter, including roof spaces and upper rooms. They may become active again during mild weather or in spring.
Signs of cluster flies in your property
Look for groups of sluggish flies at upstairs windows, around frames or in the loft. The common cluster fly has fine golden hairs behind its head and a grey abdomen. Several fly species can occur indoors, so identification matters.
Do cluster flies mean my home is dirty?
Their presence does not, by itself, indicate poor hygiene. Common cluster flies develop outdoors, with larvae associated with earthworms. Adults enter buildings for shelter.
What can you do about cluster flies?
Small numbers can often be removed with a vacuum cleaner from safely accessible areas. Check window seals and suitable gaps for repairs; proofing can help but may not exclude every fly. Avoid entering an unsafe loft or attempting work at height.
Cluster fly treatment in Somerset, Dorset and Devon
If fly numbers are making rooms difficult to use, or the problem keeps returning, contact Smyth Pest Control. Tell Warren where the flies are appearing, how many you have seen and whether the loft can be safely accessed. A clear photo can help with the initial discussion.
The appropriate response depends on the identification, building and extent of activity. Contact us to discuss an inspection, suitable control options and practical advice for your property. We help with domestic pest control and commercial pest control across our local service areas.
Tell us if bats may be present
Before any loft treatment, let us know about bats or signs of a possible roost. Do not use insecticides or sticky fly traps where bats are known or suspected; seek specialist advice first.
Can cluster flies come back next year?
Yes. A building may provide suitable shelter again the following autumn. Treatment of the current flies does not guarantee against future arrivals, so recurring problems may need seasonal management.
Ask Warren about your cluster fly problem
Looking for cluster fly control in Chard or the surrounding Somerset, Dorset and Devon area? Contact Smyth Pest Control for straightforward advice and to request a quote. Mention where you are seeing the flies so we can discuss the next steps
Cluster flies in your loft or around windows? Discover autumn signs, prevention tips and local help from Smyth Pest Control in Somerset, Dorset and Devon.
