residential clay court in semi-rural Texas!
Good thread here on tennis court construction...my two cents could be half a book I think on this. I started a clay court tennis project about 1 1/2 yrs ago doing practically all the the work myself (with some help from my kids and not much else.)
To contract out, I think some the figures mentioned here are accurate but it could vary alot since much depends upon the existing levelness, base structure, amount of root removal, and natural drainage on the site you have. I think you're looking at $20k - 25K minimum if you contract it and use "local clay" and the site is almost perfect. It goes up from there if you need lots of dirt work and you think you want Har-Tru (green clay) shipped from Virginia. Then you're probably looking at $30K plus I would suspect. If you want concrete hard-court...yes lower maintenance (but less novelty & harder on joints?)...I think you could easily go $30K - 35K given the cost of a good concrete slab.
Mine?...I think I'm keeping close to $12K. This is probably rock-bottom and I would think doable only by doing most of it yourself, having a solid, good-drainage site, and using only local clay. This is complete with irrigation and eight 1500 watt 220 volt halogen lights on 20 foot post set-ups. It's taking quite awhile but has been very satifisfying. Do not plan on anything this cheap unless you have your own tractor with implements which I have and are willing to do almost endless hours of root removal and leveling (since this area has big trees nearby and had heavy brush/trees). The state-of-the art metal halide lights were too pricey but if you're playing more than one or two nights a week with them it might be worth it since the operating costs are much lower than halogen. My project is also extreme on the side of saving money since I have actually used a 75 foot pine tree that fell on the property as my posts...25 posts with an angled-corner court to support poly fence netting on steel cables top and bottom (ten feet tall on ends and corners and almost 5 feet on sides). To cut posts, used an inexpensive "beam machine" attachment to an 18" Stihl chain saw to make rough-cut posts about 5" x 5". To treat posts I used many gallons of a copper napthenate product made by Jasco. I checked out and is safe to use. All in all, alot of work making your own posts, treating them, and installing...maybe not worth it if I had to do over but that part is done now. Other advantage I have in terms of a clay court is a 3 acre pond nearby which I am setting up irrigation with a 1 1/2 HP sprinkler pump. The final steps to trench, and hook up irrigation and electrical is mainly all that's left for me. Wiring for this project alone ran at least $1000 for 9 250' rolls of 10/2 wire, 1 roll of 12/2 for the pump, & a bunch of conduit. Concrete foundations for the tennis net posts alone took 32 bags of 80 lb. ready-mix...got to support that heavy tension on the net! Each fence post used anywhere from 2 to 4 bags depending if a taller or shorter one. As far as the clay, I must have had about 15 loads of heavier clay (maybe 250 tons) plus 4 loads of red sandy-clay for a one-inch plus top surface. It is probably a crap-shoot on the using local clay, but I think I got very lucky on that. "Local clay" can be cheap but again you've got to do some research which is not easy since low-tech "dirt pits" aren't always in the phone book or on the internet.
I'll wrap it up...I'm excited to hit balls. Have been hitting some but will be great of course to get the lines in and the fence netting up. I'd like to hear other experiences anyone has had...I'd be glad to share more on this if you're interested. Unless you really like construction projects and already have some tools (& maybe a tractor), not something most would want to take on. Of course, someone could be their own general contractor and contract out parts to keep down costs.