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Quote to replace current retaining wall

We have a 3 M long and 1.2 M high retaining wall that has started to collapse. I was looking for a quote on how much it would cost to replace the retaining wall and if possible push it further back towards the fence line. It would be appreciated if we could be provided with a time frame for how long this could take, as well an possible sketches. We can provide pictures aswell. Kind regards, Cohan