If the home plans to have more than five residents, a fire sprinkler system is required. Uniform Standard Specifications and Details for Public Works Construction—2021 Revision to the 2020 Edition.Guarantees: The contractor should guarantee construction for one year from date of completion. 3. Salt River Project has delivered low-cost, reliable power and water to Arizona for over 100 years. MWD is the only privately financed reclamation project of its kind. MWD provides water and power to service an area of approximately 60 square miles. Established in 1931, the Registrar of Contractors (AZ ROC) licenses and regulates over 45000 residential and commercial contractors.