Repairing a damaged roof valley typically costs between $300 and $1,200, depending on the severity of the problem and the specific materials involved. Minor valley repairs—such as clearing severe debris blockages, sealing small cracks in an open metal valley, or replacing a few damaged shingles along the edges—generally fall on the lower end, around $300 to $600. However, if the leak has caused rotting in the underlying plywood decking or requires tearing out and completely replacing the metal valley liner, underlayment, and surrounding shingles, the total cost frequently ranges from $800 to $1,500 or higher. Because valleys handle a disproportionate amount of water runoff compared to the rest of the roof, investing in high-quality materials like copper or heavy-duty galvanized steel during repairs ensures long-term protection and prevents recurring leaks.
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