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      The BuzzSigns of a Cluster Fly Infestation in Your Property

      November 25, 2025

      Signs of a Cluster Fly Infestation in Your Property

      What Are Cluster Flies?

      Cluster flies are a common nuisance pest in the UK, particularly during the cooler months. Unlike houseflies, cluster flies don’t breed indoors or spread disease in the same way, but they do gather in large numbers inside properties, which can quickly become overwhelming.

      Tell-Tale Signs of Cluster Flies

        • Large groups of flies indoors – often found around window frames or in loft spaces.
        • Slow, sluggish movement – cluster flies are less active than houseflies and tend to move more slowly.
        • Distinctive odour – in heavy infestations, a musty smell can develop.
        • Dead flies in windows or roof voids – they gather in dark, undisturbed areas, and carcasses may attract secondary pests.

      Common Locations of Cluster Flies

      Cluster flies can be found in both homes and business, and are most often discovered:

        • In lofts and roof spaces.
        • Around upper windows and skylights.
        • Behind curtains or blinds.
        • Inside unused rooms or voids.

      What Should You Do if You Spot Cluster Flies?

      Vacuuming and sealing entry points can help reduce numbers temporarily, but cluster flies often return season after season. The most effective solution is support from a professional pest control company.

      At Vergo, our nationwide technicians can identify the infestation, provide targeted treatments, and advise on long-term proofing measures to keep your property protected.

      Need help with a fly infestation?

      Vergo is here to help. We provide effective, tailored fly control solutions and ongoing monitoring.

      For more information, get in touch and a member of our team will be happy to provide expert advice.

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