I am installing a new lawn at a house that was built last year. The front yard has been finishd, but the backyard was never done. I need to till the soil to get rid of the weeds that grew in last summer, and put in about 40 yards of topsoil because the ground is mostly clay and sand. The topsoil will cost approx. $650 delivered. I will be seeding the lawn. The area is about 18,000 square feet and I estimate approximatly 12 hours to complete the job with two men working. I don't expect a specific price, just a ballpark. Thank you very much, Alec.