after few phone calls he will go down to what professionals in the area are charging, just after few calls from customers saying it is expensive
unless there is already good customer database with customers willing to pay it.
do not go low as the lowest ones, get the same as others pro and you will get a lot of jobs, try with your customers first, if they go for high prices keep it. Charging resonable prices you are easy doing 250-400 (thats only two full houses or even one with upholstery) for 8h, some here will say thats nothing, most of them will keep their mount shout not to say what they charge. Your area your research.