have a customer thats needs 900 sqft of sod installed. hes goin to do the prep work with his old lawn and is going to rake and rototill the old yard. hes want to just to install sod. the price of the sod is 17 cents/sqft.what would you charge to install?? do you fertilizer before the install of the sod then lay the sod over the top or do you fertilizer after???