As TD noted, it would be a very bad idea to build a new green over a main line. You will have some type of trenching equipment on site for the drain lines anyhow and pipe is cheap, so the cost of moving the line shouldn't be that much of an addition to what you'll spend to build the green. You'll probably be adding a new greens irrigation loop anyhow, so really your already spending the money for new irrigation. Moving the main shouldn't add more then a few grand at the very most, unless you've got something really unusual. We recently rebuilt 3 greens. They averaged 5,500 sq ft, CA method construction, total cost with new irrigation >$50,000. Fortunately we found an excellent sand at a very good price (I believe it's the same sand used at the new TX Tech. course). The same work in AZ or CA would have probably been 30% to 50% higher because of the cost of sand in those areas. Of course we did most of the work in house, but we did hire an experienced shaper and an architect. I'm glad to share more info if your interested. DM