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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.
1 Hiring someone to repair and seal your basement interior can run $250-$1,000 or more; if the project also includes outside excavation plus installing a waterproof barrier and footer drains, the total cost starts around $5,000-$10,000, but can run $11,000-$15,000 or more. If you don't have rain gutters on your home, install them. 2  If you have gutters, extend the downspouts. 3  Simple above-ground extensions of 3-25 feet are $10-$50 each.