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Building or repairing a basementâs retaining wall costs is $75 to $200 per square foot. Repairing the concrete behind the bowed wall can cost more than $400 per square foot.
So whatâs the bottom line about the cost to repair a retaining wall? A simple, small wall can cost as little a $800 to $1,000, while an involved project with backfill, labor and excavation can cost upwards of $20,000.The only way to know for sure how much your repair will cost is to get a quote from a qualified contractor. simple, small wall can cost as little a $800 to $1,000, while an involved project with backfill, labor and excavation can cost upwards of $20,000. The only way to know for sure how much your repair will cost is to get a quote from a qualified contractor.