What pest causes sudden cluster of flies upstairs?

Cluster flies are the most common cause in UK homes. Seasonal, mostly autumn. A loft fogging is usually the answer.

When should I call a pest controller?

As soon as you see a second piece of evidence — for example a sighting plus damage, or activity in more than one room. UK-vetted operators on the network can usually attend the same or next day.

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◉ Symptom check

Sudden cluster of flies upstairs

Lots of slow flies appearing in upstairs rooms in autumn — cluster flies.

Most likely

Cluster flies

Severity

2/5

Seasonal, mostly autumn. A loft fogging is usually the answer.

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