Wasps entering the loft. Wasps disappearing under roof tiles. Wasps flying in and out of a hedge. Wasps appearing through a bedroom ceiling. Wasps taking over a barbecue or gathering around outdoor seating, bins and drinks.
Or a brown damp-looking ring on a ceiling, and you are not sure what it is.
One of the biggest misconceptions is that every wasp in the garden means there is a nest in that hedge. Another is that all wasps behave the same way. Neither is true.
Tell us what you have noticed. We will explain the most sensible next step. Prices are plus VAT.
What have you noticed?
Common signs include:
- Wasps entering a loft, roof tiles, soffits or a wall cavity
- Wasps repeatedly flying into a hedge or a hole in the ground
- A visible paper nest
- Wasps appearing indoors
- Wasps gathering around bins, drinks and outdoor dining areas
- A brown circular damp-looking stain on a ceiling
Many people only notice a nest once worker numbers have increased. By the time the activity becomes obvious, the colony may have been developing for many weeks.
Why is it happening?
The wasps that usually cause problems around homes and businesses are social wasps. They live together in a colony and build a paper nest. This is different from the many solitary wasp species that people rarely notice.
Only new queens survive the winter. In spring, a queen emerges and starts a small nest. She raises the first workers herself. Once they emerge, the workers expand and defend the nest, collect food and feed the developing larvae while the queen concentrates on laying eggs.
A nest may be very small early in the year. By late summer, a mature colony may contain many thousands of workers. The colony then produces males and new queens. After mating, the new queens leave to overwinter and the old queen, workers and males die. The old nest is not reused.
Later in the season there are fewer larvae providing sugary secretions to the workers. The workers then search elsewhere for sugar, which is why they become much more noticeable around soft drinks, fruit, bins, picnics, barbecues and outdoor seating in August and September.
Do you have a nest, or only foraging wasps?
A nest and a feeding site are not the same thing. A direct flight line, with wasps repeatedly entering and leaving the same opening, often indicates a nest. Wasps spread across a hedge, tree or flower bed may only be feeding on nectar, sap or honeydew. They can travel some distance from the nest to find food.
Where social wasps nest
Depending on the species and the site, nests may be found in:
- Lofts, roof voids, soffits and wall cavities
- Hedges, shrubs and tree cavities
- Holes in the ground, banks and embankments
- Old mouse or rodent burrows
Some nests are clearly visible. Others remain hidden and can only be located by watching where the workers enter and leave.
Species we commonly encounter include the common wasp, German wasp, red wasp, Norwegian wasp, tree wasp and the native European hornet. Customers do not need to identify the species before contacting us.
The yellow-legged hornet is a separate concern and has an official reporting route. If you think you may have found one, use the separate yellow-legged hornet guide and the official reporting route. Send us a clear photograph if you are unsure.
Brown marks on a ceiling
A large late-season nest in a loft can occasionally rest against plasterboard. Warmth and moisture from the nest may then create a brown, damp-looking circular mark on the ceiling below. If wasp activity is also present, disturb the area as little as possible until it has been assessed.
How Guardian approaches a wasp problem
The first question is whether there is a nest to treat or whether the wasps are visiting the area to feed. The answer determines the most sensible approach.
Nest treatment
Where a social wasp nest or its access point can be identified, treatment is directed at the colony or the route being used. The aim is to control the nest, not simply the individual wasps visible outside.
Foraging wasps
Not every wasp problem involves a nest that can be found on the property. Foraging activity may be reduced through suitable wasp traps, better waste handling and reducing the food or drink residues attracting them. This can be particularly useful around café seating, picnic areas, beer gardens, leisure venues and other outdoor eating areas.
Wasps inside commercial premises
Guardian can supply and service suitable insect light traps and electric fly killers for commercial premises. The right equipment and position depend on the building, the activity and any food safety or audit requirements. Equipment does not replace good waste management, exclusion and investigation of the source.
What happens when we visit?
We assess:
- Whether a nest is present or the wasps are foraging
- The nest or access point, where it can be identified
- Accessibility and the risk to occupants, customers and staff
- The most appropriate treatment or management option
Where a nest has been identified and it is safe and appropriate to do so, treatment is normally carried out during the same visit. We explain what has been found, what has been done, any precautions you need to follow and what to expect afterwards.
Domestic customers and one-off jobs receive an electronic report. Planned commercial contracts normally receive electronic visit reports together with the agreed site records or pest management folder.
Wasps may remain active for up to 48 hours after treatment. Follow the technician’s advice and avoid disturbing the treated area while the treatment is working.
Will one visit be enough?
Often, yes. Many wasp nest treatments require one visit, although activity may continue for up to 48 hours after treatment.
Exceptionally large nests, difficult access or unusual nesting locations may require additional assessment or work. We will explain realistic expectations during the visit.
We do not normally remove the old nest. Once the colony is inactive, the nest is not reused and can usually be left where it is.
We do not guarantee that wasps will never return to the property. A new queen may choose another suitable location in a future year.
Commercial considerations
Wasps can create customer complaints, sting risks and disruption at food premises, hospitality sites, schools, care settings, leisure venues and workplaces.
The right approach depends on whether there is a nest on site, where people are being affected, what is attracting the wasps and any food safety, audit or access requirements. The work may involve nest treatment, foraging wasp management, suitable trapping, insect light traps or practical site recommendations.
Commercial work can normally be discussed over the phone before a visit is arranged. Prices are plus VAT.
Frequently asked questions
Will wasps reuse an old nest?
No. An old social wasp nest is not reused, although a new queen may build another nest nearby in a future year.
Why are wasps worse in August and September?
As the colony begins to wind down, fewer larvae are present to provide sugary secretions to the workers. The workers then search for other sugar sources and become more noticeable around food, fruit and drinks.
Why are wasps going into the ground?
Some social wasps nest underground and may use old rodent burrows or other existing cavities.
Why are wasps all over my hedge?
They may be feeding on nectar, sap or honeydew rather than nesting there. A regular flight line into one point is a stronger sign of a nest.
Do I definitely have a nest?
Not necessarily. Foraging wasps can travel some distance from their colony. Tell us whether they repeatedly enter one opening or are spread across a wider area.
Why is there a brown ring on my ceiling?
In some cases, a large loft nest resting against plasterboard can create a brown damp-looking mark. Do not disturb the area if wasps are also active nearby.
How long will wasps remain active after treatment?
Some activity may continue for up to 48 hours after treatment. Follow the technician’s advice and avoid disturbing the treated area during that time.
Will you remove the nest?
No. We do not normally remove wasp nests. Once the colony is inactive, the old nest is not reused and is usually left where it is.
What if they are honey bees rather than wasps?
Send us a clear photograph or short video if you are unsure. Guardian does not destroy honey bees. We will help you identify the activity and explain the appropriate next step.
Should I treat a wasp nest myself?
We advise caution. A disturbed nest can produce a strong defensive response, and stings can be serious for some people. Do not take risks with height, poor access or a nest close to occupied areas.
Are hornets wasps?
Yes. The native European hornet is a social wasp. The yellow-legged hornet is a separate invasive species with an official reporting route. Send us a clear photograph if you are unsure which insect you have found.
Tell us what you have noticed
Tell us:
- Where you are seeing the wasps
- Whether they repeatedly enter a specific opening
- Whether the activity is indoors or outdoors
- How long it has been happening
Clear photographs and short videos are often useful. We will explain the most sensible next step.
