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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.
Signs and Costs of a Potential Sewer Main Problem. The average cost to repair a sewer main is $2,401, although you could spend anywhere between $1,044 and $3,785, depending on the kind of damage. Homeowners should pay keen attention to the tell-tale signs of sewer system problems or damage.