Found a Wasp Nest in Your Loft in the Lea Valley? Here's What to Do
Lofts are warm, dry and quiet, which is exactly what a queen wasp looks for in spring. Understanding why helps you spot a nest early and respond calmly.
A queen looking for a home
In early April, depending on the weather and how mild the spring is, a queen wasp emerges and starts to look for a place to build. She is searching for shelter, and a loft ticks the boxes. It is dry, it is out of the wind and it is rarely disturbed. Gaps in the eaves, a loose tile or a poorly fitting vent give her a way in.
Lofts are not the only place. Nests also appear in walls, chimneys, trees, bushes and holes in the ground. But a roof void has the advantage, from a wasp’s point of view, of being left alone for months at a time.
Houses of every age and size have lofts, and so the pattern is not limited to a particular type of property. Terraces, semis, bungalows, converted barns and detached houses can all offer a way in. The question is not what sort of house you live in, but whether there is a small gap somewhere and a quiet space beyond it.
What makes a loft appealing
It helps to think about the loft as a wasp would. A few features come up again and again.
- Warmth: the heat that builds beneath a roof in summer suits a growing colony.
- Shelter: a nest is protected from rain and wind.
- Quiet: nobody goes up there for weeks at a time.
- Access: small gaps at the roof edge are enough for a queen and, later, a stream of workers.
- Materials: wood in the roof structure can supply what wasps use for building.
The point is that no household is at fault. A clean, well-kept house can have a nest in the loft as easily as a neglected one. The queen is looking for a gap, and any building has some.
A loft that is well used, with a boarded floor and regular visits, may be less attractive than one that is left alone. But even a loft you visit twice a year can be chosen. A queen does not know how often anyone goes up there, and she builds in the spring, long before most people look.
How a nest develops
Over the spring a queen builds a small nest and rears the first workers. After that the colony grows quickly. By August it peaks, and a nest can hold as many as 2,000 wasps. The earlier you catch it, the smaller it is, but even a small nest will keep growing if left.
This is why a wasp or two near the roof edge in May deserves attention. In a loft, you will not see the nest itself, so the evidence is indirect: wasps going in and out of a gap, a constant hum from above, or wasps appearing indoors.
In practice most householders notice a nest in late summer, when the colony is at its largest and the traffic at the entrance is hard to miss. By then the nest is a good size, though the price remains the same. The fixed price does not depend on size, and it is not higher for a large nest than a small one. Only difficult access can change it.
What to look for from outside and inside
From outside, watch the roof edge on a dry, warm day from a safe distance. A steady procession of wasps heading to the same gap suggests a nest in the roof space. From inside, listen at the top of the stairs and in rooms below sloping ceilings. A low humming, or wasps at a window, are further clues.
Do not go to the loft to check. Opening the hatch puts you close to the colony. The signs from outside and inside are enough to justify a call.
From the garden, the best time to watch is a warm, dry spell, when the wasps are most active. Choose a spot a few metres from the house with a clear view of the eaves and the corners of the roof. Stay a minute or two, then move away. If wasps start to follow you, go indoors.
What not to do
Understanding the motive for the nest should not tempt you to act on it yourself.
- Do not block the gap that wasps are using.
- Do not spray or pour anything into the hole.
- Do not poke at the ceiling or the hatch.
- Do not try to smoke them out.
- Do not leave windows open near the nest.
Each of these makes wasps more likely to turn up indoors or sting. Leave the nest alone and keep your distance.
There is also an indoor mistake worth avoiding: leaving the loft light on, or a window open on the landing, in the hope that wasps will head towards it and away from you. It is more likely to bring them into the house. Keep windows near the roof void closed, and keep the hatch shut.
Getting it treated
Your local technician covers the Lea Valley and surrounding villages, and the treatment is a fixed £70 per nest, with £30 extra for an additional nest on the same property. There is no call-out charge, and the price is confirmed on the phone before the visit. If special access equipment is needed to reach the nest, the price might be more, and no work is carried out without your agreement.
The technician is fully insured and qualified, and both homes and businesses are covered. Same-day service is offered, so ring early, and tell the business about any allergy in the household.
Bookings are taken by phone on 07852 111 437, or through the booking form and contact page on the website. Afterwards, a look at the roof edge in April each year may help you catch a new nest while it is small.
After the visit, ask the technician if there is anything about the roof edge or the eaves that has made the loft easy for wasps to enter. It may be a gap, or it may be just how the building is built. If it is something you can have repaired, do it outside the wasp season, or ask a roofer once the nest has been treated.
Wasps on your property in Lea Valley?
Fixed price £70 per nest, no call-out charge, same-day service available.