This easy-to-use Irrigation Installation Contract Template! This template is the ideal design to promote and get the word out about your services.• All license expiration dates will be verified at the TCEQ website. What is required in a contract for landscape irrigation services? A written contract is required for all irrigation system installations. Make changes to your irrigation system, get a cash rebate, and get the garden or landscape you want without the high water bills. San Antonio Ordinance Chapter 10 Section 108(a) requires design professionals prepare the construction documents for the following: •.