$30-50K to add a full floor. Only renovation that creates square footage.
Basement finishing creates new square footage for $30-$75 per square foot, adding $20-$50 per square foot in home value—a cost efficiency that outperforms the average addition's $100-$200 per square foot. A 1,000 sq ft finish can yield a bedroom, bathroom, and rec room for $30,000-$50,000. However, avoiding waterproofing risks mold; proper measures like interior drainage, sump pump, vapor barrier, and dehumidifier ensure a usable floor at a fraction of the cost of a traditional addition.

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