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Concrete Retaining Wall Prices. Concrete retaining wall prices start around $30 per square foot including materials and installation and can go as high as $45 to $50 per square foot depending on how much prep work is involved in building the forms.Walls higher than four feet typically require a different type of form which will raise the cost.oncrete Retaining Wall Prices. Concrete retaining wall prices start around $30 per square foot including materials and installation and can go as high as $45 to $50 per square foot depending on how much prep work is involved in building the forms.
1 Do-it-yourself materials cost about $10-$15 a square face foot. 2  ThisOldHouse.com provides a video showing how to build a block wall, calling the project challenging and estimating it will take two people 8-10 hours for a low wall 10-16 feet long. Materials and installation for a stone retaining wall start around $25-$40 a square face foot and go up depending on materials, site conditions, and other factors.