While I haven't had any experience with new installs here in Texas, I do have some general advice based on a system I had put in when back in CA:Originally Posted by miataspeedracer
1) Decide if you want a perfect install, a cheap install, or something in between. I got 4 estimates for my house and they varied greatly. You can get a really cheap job done (as I did) by one of the guys that leave yard care ads on your door, but you get what you pay for. I ended up replacing and re-adjusting a few heads on my own, and they used pretty cheap heads and valves. If I had spent about twice the money, I would have gotten a licensed contractor that spoke english, used higher quality parts, and properly adjusted the system before walking off with my money. If you plan on selling the house a year from now, get a cheap install. If you are going to live there forever, or it is for a rental property that you will need to maintain for years, have it done right.
2) Have the different sprinkler companies (Toro, Rain Bird, etc) create plans for you. You fill out a layout of the yard and give them your water pressure info and they will make full plans and parts list for you. It only costs around $20, and you can use the plans and parts lists to compare to what the installer tells you that he will do.