Hello; I'm looking for help bidding on a grading and seeding job. I'm told that you charge by sq. ft. What's the going rate for a job like this. I'd like to give 2 quotes - 1 including the removal and disposal of existing grass, and 1 without removal of existing grass (they want me to lay topsoil right on top of the existing grass). I'll need to put up to 4" of topsoil before I spread the grass seed. They'd also like a quote without the cost of materials to see if they'd be able to do better getting the materials on their own. Any suggestions as to how I charge this one?