partner, why are you dancing all over the place with weather reports and climate considerations reguarding sprinklers instead of just looking at the states web site. i live three hours away from you and i am required to have a lic. you cannot tell me that you are going to install an irrigation system of any size for less than $500. i didn't notice in your tag you having a trencher(rent or hand dig costs money) if you spend $200 on parts i'm sure your labor costs as an above board "contractor" will exceed $300. i did a retrofit a few weeks ago and the heads alone were $250, total materials $800 with three men, three days not counting three or four trips to the job for tests and a check up visit a week later( makes people feel special, and good customers are). i have a gut feeling that you don't choose to get a lic. as long as you can get away with dingbatting. if i have to have a lic. i don't see why you don't.