Roof repair costs average between $380 and $1,680 and will help eliminate the underlying problem. If the leak is large or has existed without detection for a long time, you may pay as much as $7,000 for professional remediation. If the attic is easy to access, expect a lower quote for mold remediation. The attic is a common growth area because of the potential for roof leaks onto insulation and sheetrock that can cultivate ideal conditions for mold. Remediating mold spores in your attic typically ranges between $1,000 and $4,000. Find hiring guides, material costs, expert advice, how-to's and more.