The costs related to hiring a cockroach exterminator in Washington depends on the severity of the infestation, finding the root cause of the infestation, the tools, equipment, and chemical solutions that will be used plus the labor. Most homeowners are reported to spend around $150 to $600 for a professional cockroach exterminator in Washington. The price varies depending on the size of the house or property that needs to be exterminated. Technically, the larger your property is, the more expensive it can get. You also need to take into consideration the kind of cockroach that is infesting your home. A professional Washington cockroach exterminator may use different techniques and pest solutions depending on the kind of roach found in your home. This is important because each species has their own survival instinct and can withstand extermination techniques if the wrong one was applied.