I have been asked to build a Wall using 6 inch block. All the material will be provide by the customer. I want to know would you price the job per sq. foot or try to estimate an hourly rate and hope to be close . With out letting the customer know your hourly rate. The wall is aprox. 150 foot x 4 foot tall.. My normal rate if I was bringing in the material would be $18.00 PER SQ FT. what would be a fair going price for just labor?