🪰 Autumn and winter, with flies reappearing on warm spring days

Cluster Fly Loft Fumigation in London

Hundreds of slow, buzzing flies in the loft or around upstairs windows? Our loft fumigation clears overwintering cluster flies quickly and safely.

Call 020 3369 9469 Prices from £240

Book cluster fly loft fumigation

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020 3369 9469

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★ Offer£50 off a second treatment on the same visitClaim

BPCA-qualified, fully insured technicians
Over 20 years' experience
Discreet, unmarked vans
Family & pet-safe treatments
Fixed prices – no hidden extras

About cluster flies in London homes

Cluster flies are larger and slower than house flies. In autumn they gather in their hundreds or thousands in lofts, roof voids and wall cavities to spend the winter, often returning to the same homes year after year. On warm days they wake up and drift into bedrooms and around upstairs windows.

Signs of cluster flies

Large numbers of sluggish flies in the loft or roof space
Flies gathering around upstairs windows, light fittings and ceilings on sunny days
Piles of dead flies on window sills and loft floors
Buzzing in the loft or behind ceilings in autumn and winter

How we treat cluster flies

Inspection of the loft and roof space to find where the flies are clustering
Professional fumigation of the loft space to reach flies hidden in gaps and insulation
Advice on keeping the loft hatch closed and when it's safe to go back in
Tips on reducing gaps around eaves and vents to limit next year's flies

Cluster Fly Loft Fumigation prices

Your home:

Flat

£240

House

£280

Loft fumigation treatment. No VAT to add. Fixed price confirmed before we start, with no hidden extras.

🎉 £50 off a second pest treatment on the same visit

Need two different pests treated? When both treatments are carried out on the same visit, you save £50 on the second one.

Quote code TWOPESTS when you book.

Cluster Fly Loft Fumigation: 5 frequently asked questions

Why do cluster flies keep coming back every year?

Cluster flies are drawn to the same buildings each autumn, especially homes with sunny, south-facing walls. Treating the loft each autumn keeps numbers down.

Are cluster flies harmful?

They don't bite and they don't breed indoors, but large numbers are a real nuisance and dead flies can attract other insects.

Do I need to leave the house during loft fumigation?

You don't usually need to leave the house, but the loft must stay closed for a few hours after treatment. We'll tell you exactly when it's safe to go back up.

When is the best time to treat cluster flies?

Autumn, when the flies are gathering in the loft, or a mild winter day when they're active. Treating then clears them before they spread into the house.

Can I just vacuum them up?

Vacuuming removes the flies you can see, but most hide in gaps in the loft and roof. Fumigation reaches them where they're clustering.

Dangers of cluster flies: 5 reasons to get them treated

Large numbers of flies drift into bedrooms and living areas on warm days.
Dead flies in lofts and window sills attract other pests, such as carpet beetles.
They leave dark spots and marks on windows, walls and ceilings.
Large clusters can give off an unpleasant, sickly smell.
They return to the same homes year after year.

5 interesting facts about cluster flies

Cluster fly larvae live as parasites inside earthworms.
Cluster flies are slightly bigger and slower than house flies.
They have golden hairs on their bodies.
Cluster flies don't breed indoors. They only shelter in homes for the winter.
They often gather in the same buildings every year, possibly drawn by scent left by earlier clusters.

Cluster Fly Loft Fumigation near you

We provide cluster fly loft fumigation in every London borough. Choose yours for local information:

Need cluster fly loft fumigation?

Call now for same-day or next-day visits. Fixed prices from £240.

Call 020 3369 9469 WhatsApp us Request a callback