What pests are most expensive to remove?

The pests that are most expensive to remove are those that require specialized equipment, multiple visits, extensive labor, and have high resistance or hidden colonies, with termites, bed bugs, and German cockroaches ranking at the top for cost. Termites, especially subterranean termites, are the most expensive overall because a single colony can have millions of members underground, damage wood silently for years, and require trenching around foundations, drilling through slabs, installing bait monitoring systems, and annual monitoring, costing $1,000 to $3,000 for liquid barrier treatment for a typical home and $3,000 to $6,000 for severe or large homes plus $300 to $500 per year for monitoring. Bed bugs are the second most expensive due to their ability to hide in mattress seams, box springs, bed frames, and electrical outlets, survive up to a year without feeding, and resist many insecticides, requiring whole-home heat treatment raising temperatures above 120 degrees Fahrenheit plus chemical treatment and encasements, costing $1,000 to $3,000 for a full home and $300 to $900 per room, often needing two to three visits. German cockroaches are expensive because they reproduce extremely fast, with one female producing 30,000 offspring per year, hide in tiny cracks in kitchens, and need multiple baiting visits costing $150 to $400 initially plus follow-ups. Wildlife like raccoons, squirrels, and bats requiring humane trapping and attic cleanup with guano removal can cost $400 to $1,500, and extensive rodent infestations with exclusion and cleanup can also be costly.