Wasp Nest in a Cavity Wall – How Professionals Treat Hidden Nests in Cross Green
Many cavity nests begin with something as small as a missing patch of pointing, and a careful walk around the outside of the house can show where.
The patch of missing mortar
On a mild afternoon you are tidying the side passage and notice a small dark gap between two bricks, about as wide as a pencil, with a wasp walking out of it. A second follows. When you step back, you can see it is a patch of old mortar that has worn away to leave a hole at head height. It might have been there for years, unnoticed.
A spot like that is just what a spring queen needs. She can enter, explore the cavity behind and decide that it is a good place to start a colony.
The pattern is common. Over the winter, frost lifts old mortar, rain washes sand from joints and ivy roots work into cracks. None of this is visible from the garden path, and the first sign is a wasp walking out of a hole nobody knew was there.
Do not assume an old wall is the only candidate. Newer brickwork can open up at the corners of extensions, where the new meets the old, or around the edges of replacement windows.
Walking the outside of the house
A short, careful survey in daylight helps you describe the problem. Stay several metres from any busy area and do not touch the brickwork.
- Look low along the base of the walls and around air bricks
- Look at joints around windows, downpipes and gas or electric boxes
- Check the mortar beneath eaves and around chimney breasts
- Note any spot where a steady stream of wasps comes and goes
If you spot one, make a note of its position in relation to a window or door, so you can describe it by phone.
Take your time and keep checking at different heights. Wasps often use gaps well above head height, under the line of the roof, and a pair of binoculars from the lawn is far better than a ladder. Never lean a ladder against a wall where wasps are active.
Make a note of the date and time you saw activity, as wasps are most visible during the warmest part of the day, and a wall that looks quiet at nine o'clock may be busy by two in the afternoon.
Why a small gap makes a large nest
A wasp does not need a hole the size of a fist. A gap a few millimetres wide is enough for one insect, and what it finds behind is a cavity many times the size of the opening. As the season progresses the colony expands into the available space, adding layers of paper comb. The opening stays small because the workers only need to get in and out.
This is why a quiet-looking wall can still hold a large nest. The size of the hole tells you little about what is inside.
Because the cavity continues around the building, a nest that starts at one corner can extend along the wall. The technician will ask where wasps are entering and where you have heard or seen anything inside.
What the technician does at the wall
Once the active gap has been identified, it is the focus of the visit. The nest is treated through that opening, which means the technician does not need to take the wall apart. They will tell you what they are doing and how long they expect to be there, and they will also tell you what to watch for afterwards.
We cover Cross Green and the neighbouring areas, seven days a week with same-day service. The price is fixed at £90 per nest, £35 for each additional nest on the same property, with no call-out charge. We confirm the price on the phone first, work only with your agreement, and our trained technicians are fully insured. Domestic and commercial properties are both covered.
On arrival, expect a short chat, a look at the wall from a safe distance and then the treatment itself. Householders usually stay inside with the windows shut. Once it is done, the technician will explain what to watch for and advise when it is reasonable to start planning the repair.
Repointing after the wasps have gone
Weathered mortar should be repaired, but not until the wasps have stopped using the gap. Once the nest is finished, ask a builder or confident DIYer to rake out loose material and repoint the area. Even a small repair can stop a queen choosing the same place next spring.
Look over the rest of the wall while you are at it. If one joint has failed, others of a similar age might not be far behind. Tackling them in autumn or winter, when the insects are inactive, is much more comfortable than doing it in July.
Many people ask whether to use a pre-mixed product or make mortar from scratch. For a few small gaps, a ready-mixed bag from a builders' merchant is plenty. For a larger area, a bricklayer will match colour and texture so the repair does not stand out.
When to look again
Wasps begin looking for nest sites from late April, depending on how mild the spring has been. A quick walk round the house at that point, with a view to spotting gaps, costs nothing. If you notice a queen investigating a hole, a repair that day can prevent a nest altogether, as long as no wasps are inside.
If you see regular traffic at a crack at any time through the summer, treat it as a nest, keep clear and ring 0113 347 0014. You can also fill in the booking form on the contact page.
Keep a short record of where the gap was, what was done and when, so that you can check on it each spring.
Wasps on your property in Cross Green?
Fixed price £90 per nest, no call-out charge, same-day service available.