When I’m climbing around in lofts looking for wasps’ nests, I often come across cluster fly infestations as well. Both pests are drawn to lofts and roof spaces, but for different reasons.
Wasps are usually active during spring and summer. By autumn, nests are often abandoned—but old nests can still be found tucked away in corners, roof beams, or behind insulation. Occasionally, late-season queens may try to overwinter in loft spaces, which is why we still get the odd wasp call even in colder months.
Cluster flies, on the other hand, become a real issue as the temperature drops. These flies aren’t like the ones you find buzzing around bins. They don’t breed in your home or feed on waste. Instead, they gather in large numbers to hibernate in lofts, attics, and wall cavities, attracted to the warmth and shelter.
At first, they often go unnoticed. But as heating comes on or the sun warms roof tiles, they can start emerging and buzzing around light fittings, windows, or loft hatches. It’s usually around Christmas, when people go up into the loft for decorations, that the problem becomes clear.
If you’re seeing large numbers of flies, especially in upper rooms or loft spaces, there’s a good chance cluster flies are the cause. Although they’re not harmful, they can be a real nuisance and will return year after year if not properly treated.
We offer effective treatments for both wasps and cluster flies, including safe removal of old nests and targeted fogging for loft infestations. Get in touch if you’d like to book a visit or need advice on what to do next.