In July and August, a wasp nest reaches its peak size: several thousand individuals for the common wasp. It's also when colonies become most defensive. A few pointers before you reach for the insecticide spray or call the fire brigade.
Identifying the nest: wasp, hornet or bee
In Belgium, two species dominate: the common wasp (Vespula vulgaris) and the German wasp (Vespula germanica). Their nest is made of chewed wood fibre, a grey cardboard-like texture, often hidden: under a roof, in a shutter box, a garden shed, a wall cavity or directly in the ground.
The European hornet (Vespa crabro) is larger (up to 3.5 cm) but less aggressive than people think. The Asian hornet (Vespa velutina), recognisable by its yellow leg tips and dark body, is an invasive species that should be reported: it's covered in our dedicated article.
Bees aren't treated: a honeybee swarm is relocated by a beekeeper, free of charge in most cases. If the insects are stout, hairy and brown, contact a local beekeeper before anything else.
Watch the flight path: steady back-and-forth traffic to one fixed point (a hole in the facade, a roof edge, the ground) locates the nest entrance, even when the nest itself is out of sight.
The colony's cycle: why July–September is critical
A queen founds the nest alone in April. By June, the colony numbers a few hundred workers. By late August, it can exceed 5,000 individuals for the common wasp. The further the season goes, the more populated the nest and the more aggressively the colony defends its entrance.
In October-November, the colony dies naturally: only future queens survive, scattered in hibernation. A nest is never reused the following year. A nest found late in the season, inactive and away from foot traffic, can sometimes be left in place until winter.
The problem: between July and September, an active nest near a door, terrace, bedroom window or a spot children pass through poses a real risk of multiple stings. That's the window where removal is justified.
Why not to destroy the nest yourself
Wasps release an alarm pheromone when the nest is attacked: it triggers a collective defence. A failed attempt with a supermarket insecticide spray typically results in dozens of stings, on you and sometimes on the neighbours too.
Nests are rarely cleanly accessible: under an eave 6 metres up, in a wall cavity, in the ground. Working at height, at night, under stress, with a spray can at arm's length: it's the classic recipe for a fall from a ladder.
In 1 to 3% of the population, a sting can trigger a severe allergic reaction (anaphylactic shock). Several deaths are recorded every year in Europe. If you're allergic, or don't know whether you are, stay away from the nest.
The only reasonable DIY case: a newly founded nest in April-May, golf-ball sized, with only the queen present, reachable without a ladder. Past June, professional intervention is required.
Fire brigade or a specialist company?
In Belgium, wasp nest removal by the fire brigade is chargeable in most rescue zones, and the rate varies by zone. More importantly, these interventions are non-priority: in peak season, the wait can reach several days, or longer during call surges.
A specialist company responds faster, handles difficult configurations (a nest in a wall cavity, under a roof, in the ground) with professional equipment and products, and comes back if the colony isn't fully dealt with. Antinox includes a written guarantee: if activity resumes at the same nest, the repeat visit is free.
At Antinox, wasp treatment falls under insect control: price set during the on-site assessment based on accessibility and the nest's configuration. Get a quote in 2 minutes, fast response. Reachable 24/7.
After treatment, and how to avoid the next nest
After an insecticide powder injection, activity drops within hours and stops within 24 to 48h. Never seal a treated nest's entrance right away: wasps returning from foraging need to pass through the treated area for the whole colony to be reached.
The following spring, inspect risk areas starting in April: shutter boxes, garden sheds, under eaves, vents. A newly founded nest can be removed in minutes; the same nest in August requires a full intervention.
Cut down on attractants in summer: keep bins closed, pick up fallen fruit, cover sugary drinks on the terrace. Wasps hovering around a table don't necessarily come from a nest at your place: beyond a few persistent individuals, look for the flight path.
Frequently asked questions
Can I just leave the nest alone?
Yes, if the nest is away from foot traffic (the far end of the garden, an isolated tree) and no one in the household is allergic. The colony dies naturally in October-November and the nest will never be reused. However, an active nest near a door, terrace or window between July and September should be treated.
How much does wasp nest removal cost in Belgium?
At Antinox, the price is set during the on-site assessment: it depends on accessibility (height, wall cavity, ground) and the number of nests. The fire brigade also charges for the intervention in most rescue zones, often with long waits in summer.
What time of day is best to treat a nest?
Ideally early morning or evening, when most workers are in the nest: treatment then reaches the whole colony at once. During the day, some wasps are out flying and return to the treated nest over the following hours.
Do wasps come back to the same spot the following year?
Not to the same nest: it's never reused. But a favourable spot (a shutter box, a sheltered eave) can attract a new queen in spring. Sealing access points after the season and inspecting from April onward prevents a repeat.