How much does a loft fly treatment cost in Essex?

Most domestic ULV fogging treatments fall between £120 and £220 depending on loft size and access. Larger barn conversions or thatched properties cost more because of additional sealing work.

Will they come back next year?

Often, yes — the aggregation pheromone soaks into timber and can attract new flies for several seasons. Annual or biennial treatment is normal for the worst-hit properties, with numbers reducing each year.

Are cluster flies the same as bluebottles?

No. Bluebottles are metallic blue, fast-flying, and breed on decaying meat or dead animals indoors — they're a sign of a hidden carcass and need a very different response. Cluster flies are slow, dark and seasonal.

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Cluster Flies in the Loft: An Essex Autumn Survival Guide

Every September and October we get the same call across Essex: dozens — sometimes hundreds — of slow, sluggish flies appearing at upstairs windows, especially in the loft or top-floor bedrooms. They're not bluebottles, they're not house flies, and shop-bought spray barely dents them.

What you've got is cluster flies, and there's a very specific reason they keep choosing your house year after year.