Charges will vary by location within the country, as well as location of the graffiti. Some general numbers to work with: A mobilization charge of $30 - $70 to get your truck and man to the job sight. Costs per square foot are then calculated for ground level work - anywhere from $1.00 to $3.00 depending on geographic location and market conditions. If the tag is difficult to get to, hard to get equipment to or considered high work, the cost psf can rise substantially. As a general rule of thumb -- the chemical costs should be about 10% of the total job cost.