Whether you can legally do your own plumbing in Arizona depends on the nature and complexity of the work. Here’s a breakdown: Permitted DIY Plumbing: Minor repairs: You can handle certain minor repairs without a permit or professional help, such as: Replacing leaky faucets or showerheads Repairing or unclogging simple drains Installing some appliances like dishwashers or washing machines (following manufacturer instructions) Replacing toilet flush levers or flappers Restricted DIY Plumbing: Major repairs or alterations: Anything beyond minor repairs typically requires a permit and should be done by a licensed plumber, including: Installing or replacing pipes Repairing leaks in walls or ceilings Moving or adding plumbing fixtures Working on water heaters or gas lines Installing new sewer lines Reasons to Hire a Licensed Plumber: Safety: Plumbing involves water and gas lines, which can be dangerous if not handled properly. A licensed plumber has the knowledge and experience to do the job safely and adhere to building codes. Permits: Many plumbing jobs require permits, and only licensed plumbers can obtain them. Code compliance: Licensed plumbers understand and follow local building codes, ensuring your plumbing work is up to standard. Preventative maintenance: A licensed plumber can identify potential problems and recommend preventative measures to avoid future plumbing issues. Warranty: Some repairs may only be covered by warranty if performed by a licensed plumber. Resources: Arizona Registrar of Contractors: https://roc.az.gov/ City of Phoenix Permit Requirements: https://www.phoenix.gov/pddsite/Documents/TRT/dsd_trt_pdf_00618.pdf In conclusion, while some minor plumbing repairs are permissible DIY projects in Arizona, anything beyond that should be handled by a licensed professional for safety, legality, and long-term peace of mind.