The answer to 'frequency of retaining wall installation' is that retaining walls typically need to be installed every 15-25 years, depending on the materials, climate, and usage. Retaining walls are important structures that hold back soil and prevent erosion, but they can deteriorate over time due to weathering, ground shifting, and other factors.
Homeowners should inspect their retaining walls regularly and consider replacing them if they show signs of significant cracking, leaning, or other structural issues. Professional landscaping contractors can assess the condition of a retaining wall and provide recommendations for repair or replacement as needed.