What it costs: Retaining wall installation typically runs $3,500–$11,000, with prices driven by height, length, materials, and site conditions. Material matters: Timber is cheapest but less durable, ...

Dear James: I’m planning a veggie garden on my sloping lot so I need a retaining wall. I have used timbers before, but blocks might hold up better. Which method do you prefer? -- Steve W. Dear Steve: ...