Wallace Pest Control

Cluster Fly Removal

Cluster Fly Treatment Accrington

Accrington's Leading Cluster Fly Control Experts

Cluster flies might not pose a direct threat to your health, but when they invade in large numbers, they can quickly become an overwhelming and unpleasant nuisance. These slow-moving flies tend to gather in lofts, roof spaces, window frames, and wall voids—especially in rural or semi-rural areas. Come autumn, they begin to gather in huge numbers, often reappearing year after year if left untreated.
Cluster Fly closeup

Contact Wallace Pest Control

If you require urgent assistance with a cluster fly infestation, please use the form below or call us at 07496 680879. Our experienced and friendly team is ready to provide advice and deliver an effective solution.

    Treatment of Cluster Fly Infestations

    Our typical treatment for cluster flies involves the use of space treatments (fogging or ULV) to reach the insects wherever they may be hiding, such as in roof voids, lofts, and cavity walls. These treatments knock down the active adult flies quickly and effectively.

    In addition, residual insecticides may be applied to areas such as window frames, sills, and eaves where flies tend to gather on warm days. For properties with recurring issues, we can also recommend preventative measures before the flies begin to hibernate—usually between late summer and early autumn.

    Cluster fly control may require multiple visits depending on the severity of the infestation and how accessible the harbourage areas are.

    Cluster Fly on Grain

    Causes of Cluster Fly Infestations

    Cluster flies enter properties in late summer and autumn in search of a warm, dry place to hibernate. Once they find a suitable site - often your attic, loft, or cavity walls - they settle in and form large groups, sometimes in the thousands.

    Come spring, they begin to emerge, often causing alarm as they appear suddenly around windows and light fittings. In some cases, they’ll even become active on warmer winter days if the sun warms up your loft space. Unlike houseflies, cluster flies don't breed indoors or feed on waste.

    Instead, their larvae are parasitic to earthworms, meaning properties in more rural or open areas are more likely to experience recurring infestations.

    They often return to the same property year after year, guided by scent trails left by previous generations.

    Have You Got Cluster Flies?

    Signs of a cluster fly problem include:

    • Large numbers of slow-moving flies gathering at windows, especially on upper floors
    • Flies emerging from loft hatches, ceiling light fittings or air vents
    • A sickly, musty smell in lofts or attics
    • Dead or dying flies around windowsills or in roof spaces

    Activity peaking in early spring and autumn

    While one or two flies may go unnoticed, cluster fly infestations often involve hundreds - sometimes thousands - of insects emerging over several weeks.

    Once they’ve established your home as a suitable overwintering site, they’ll likely return every year unless professionally treated.

    Professional treatment is the most effective way to deal with a cluster fly infestation. DIY sprays rarely reach the hidden areas where these flies hibernate, and vacuuming alone only provides temporary relief.

    Wallace Pest Control provides fast, discreet, and reliable cluster fly treatments across Accrington and surrounding areas.

    Call us now on 0749 6680879 if you’re experiencing a cluster fly problem—we’re here to help, quickly and professionally.