If you find more than one I would definitely take action in your house. If I'm doing a brown recluse treatment in a house I treat under all baseboards, pull all the receptacle/ light switch covers off and treat behind those. Pull everything out of the closets and treat there, under all pieces of furniture, strip the bed to the basics and treat all cracks, etc etc.
Very involved treatment...they pay well.
what do they do, spray the house? doesnt that process make them come out from hiding?