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Roach spray usually starts working almost immediately on contact—within seconds to a few minutes. However, if it's a residual spray designed to keep killing over time, it can take hours or even days to fully affect roaches that come into contact with treated surfaces. For larger infestations, it may take at least a week to see a noticeable drop in activity, since not all roaches are exposed at once.

Bed bugs typically will not go away on their own. If there are no humans or animals around, they will need to leave to find a host for feeding. But otherwise, bed bugs can live for several months to a year, and the adult females can lay hundreds more eggs in their lifetime. An infestation is only likely to get worse without hiring an exterminator.

Roaches may not be quite as common on the top floors of a home, but they can easily climb up there if they want to. Second stories are less likely to have food sources and somewhat less likely to have moisture issues, so most roaches are attracted to bottom levels first. However, humid attics and similar spots can help roaches thrive.

Professionals employ protective measures such as covering or temporarily relocating plants, minimizing chemical usage, and carefully planning construction routes to avoid damage. These precautions preserve the integrity and appearance of the landscaping during projects.