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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.
Wall Demolition Cost. The cost to demolish a house wall depends on the size of wall. Generally, contractors charge $5-$10 per square foot to demolish a house wall. The cost to demolish a house wall is $1-$3 per square foot when the homeowners do the work themselves. The average house wall is 400 square feet. The cost to demolish a house wall that is 400 square feet is $2000-$4000 when done by a contractor and $400-$1200 when done by the homeowner.