About 5000 square feet, I would recommend spraying out existing vegetation, mid march, with roundup, wait 2 weeks, Harley rake it with the ASV RC30, and seed with improved tall fescue, fertilize, with starter fert, no later than 1st week of April. (MD area) Price $1300 It would behoove you to have a soil test taken, now, to see if you need to lime. Lime can be done earlier, and would add $ to the final price.
