Should you leave it alone?
In fall, the first hard frost kills most of the colony, and wasps do not reuse old nests. A small nest high in a tree, away from people, can often be left alone.
When DIY might be reasonable
- The nest is small (golf ball size or smaller), early in the season
- It is easy to see and reach from the ground
- Nobody nearby is allergic to stings
- It is not inside a wall, under siding or in the ground
When to call a professional
- Inside a wall or ceiling. Sealing the hole can drive wasps into the house.
- High up on the roofline, soffits or a second-storey window.
- Large nests in late summer, when colonies are biggest and most aggressive.
- Near doors, decks or play areas where stings are likely.
- Anyone with a sting allergy in the household.
- Ground nests in lawns or gardens where kids and pets play.
Safety tips if you go ahead
- Treat at dusk or after dark, when the colony is inside and less active.
- Wear long sleeves, gloves and eye protection.
- Use a product labelled for wasps and follow the label exactly.
- Have a clear escape route and never stand on a ladder under a nest.
What a professional visit includes
A technician locates the entrance (including hidden nests), treats the nest with protective equipment, removes it once activity stops if it is accessible, and seals entry points into walls and soffits.