There are many different types of materials for retaining walls in Phoenix Arizona. If you have a low budget, you may want to choose natural stone, which is relatively inexpensive. Natural stone can crack or chip if it is used on a slope. The second option is concrete and steel reinforced blocks. Even reinforced block walls are more expensive than its cheaper counterpart, homeowners often choose it when they are planning a retaining wall. The extra cost may be worth it, though, especially if your goal is to build a retaining wall in Phoenix that will last for decades.