Wasp nest in a wall or façade
By Wespenprofis.ch · Reviewed by:Fachbewilligung Schädlingsbekämpfung VFB-S · Updated: 3 July 2026
At a glance
The nest usually sits in a crack in the masonry or in a cavity behind the façade and uses a single opening as its entrance. Do not seal that opening — the wasps will simply look for another way out and often find it inside the building. Keep your distance and have a licensed professional remove the nest through the existing opening.
Why this situation is tricky
In a wall or façade, the colony usually uses a narrow crack in the masonry, a damaged joint or the area around a roller shutter box as the single entrance to its hidden nest. From the outside, often only a small hole is visible, while the nest itself sits deep inside the wall cavity. That is exactly what makes the situation tricky: if the opening is sealed or the area is disturbed, the wasps look for a new way out — and sometimes find it inside the building, for instance through gaps around windows, sockets or vents.
What you should do straight away
- Do not seal or tape over the entry hole in the wall crack or façade.
- Keep your distance from that part of the wall and do not touch or tap on it.
- Keep windows near the entry hole closed.
- Note the position and height of the opening so you can tell the professional.
- Contact a licensed professional (/wespennest-entfernen), who will remove the nest properly through the existing opening.
Good to know
Because the nest stays hidden inside the wall, a proper assessment on site matters all the more — size, species and accessibility can only be judged to a limited extent from the outside. Depending on the situation, cold treatment through the entry hole or mechanical removal may be the right approach. After treatment, the old nest is never recolonised, so additional chemical follow-up treatment is not necessary. If the opening is in the roller shutter box itself, see our guide on a wasp nest in a roller shutter box. For an overview of how to handle any nest you come across, read our article on finding a wasp nest — what to do.
Frequently asked questions
Why can't I just seal or tape over the entry hole?
Because the wasps will then look for another way out — and often find one inside the building, for example through gaps around windows or sockets.
How do I tell whether the nest is in the wall rather than in the roof?
The entrance is usually at façade level, often at a crack in the masonry, a damaged joint or near a roller shutter box, rather than at the eaves or under roof tiles.
Is a nest in a wall more dangerous than a free-hanging nest?
Not inherently more dangerous, but harder to assess, because the nest itself stays hidden. A licensed professional judges its size and accessibility before removal.