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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.
The range for this repair can be in the $2,000 range or in the $10-15,000 range. It all depends on concrete block walls, poured walls and how severe an issue. For instance â a 20ft wall repaired with carbon fiber straps would cost $2,400-3,000 while the same wall repaired with tiebacks would cost $$3,600-4,000.