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Wasps & hornets

Wasp nest under a chalet roof: what to do

Wasp nest under the eaves, in the loft or the timber cladding of a chalet in Chamonix: how to find it, the risks, and removal for €139.

By Mont-Blanc Nuisibles, Certibiocide-certified technicianPublished 15 October 2026
Cutaway of a chalet showing where pests hide: 1 loft, wasps, hornets, rodents; 2 bedrooms, bed bugs; 3 kitchen, cockroaches, ants, moths; 4 cellar and garage, rats and mice; 5 trees and eaves, Asian hornets12345

Why chalets attract wasps

A chalet offers everything a queen looks for in spring: dry wood to make nest paper, gaps in the cladding, wide eaves sheltered from rain and warm lofts. Wooden balconies and roller-shutter boxes are also popular.

Cutaway of a chalet showing where pests hide: 1 loft, wasps, hornets, rodents; 2 bedrooms, bed bugs; 3 kitchen, cockroaches, ants, moths; 4 cellar and garage, rats and mice; 5 trees and eaves, Asian hornets12345
In a chalet, lofts and eaves often host wasp and hornet nests.

Finding a hidden nest

  • Wasps going in and out through a gap in the cladding or under a tile.
  • Buzzing or scratching inside a wall, especially in the afternoon.
  • Wasps appearing in a room with no window open: the nest may be in the ceiling.
  • Small shavings of pale wood: wasps scrape wood to build.

Never block the entrance

A trapped colony looks for another way out, sometimes into the house. Do not spray shop-bought insecticide into the gap either: it angers the colony without reaching the nest.

How I treat a nest in a roof

I first locate the entrance and, where possible, the nest itself. I then apply a plant-based, biodegradable insecticide powder at the entrance: the wasps carry it into the heart of the nest themselves. Activity stops within a few hours; a few insects may still be around for a day or two. For small accessible nests I can also use a cold treatment, with no chemicals.

In the vast majority of cases there is no need to remove cladding. A dead nest is never reused.

How much does it cost?

Wasp or hornet nest removal
Nest locationPrice incl. VAT
Nest at 0–2 m high€109
Nest at 2–10 m high€149
Nest at 10–15 m high€199
Nest in a roof, loft, wall or under decking€139
Each extra nest, same visit+ €30

Travel and results guarantee included. Same price for wasps, European hornets and Asian hornets.

Do you let your chalet? Consider a visit in early summer before guests arrive: see my offer for holiday rentals and businesses.

Pests in your home?

Call me: I answer personally and give you a free quote. I come out within 24 to 48 hours anywhere in the Chamonix valley, 7 days a week for wasps, hornets and bed bugs.

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