How much does it cost to fix flashing on a roof?

The cost to fix flashing on a roof varies widely depending on the type of flashing, location, extent of damage, and roof accessibility, but typical price ranges help set expectations. For minor flashing repairs such as resealing a small gap around a vent pipe or applying roofing cement to a loose section, cost may be 150 to 400 dollars for a service call and labor. Replacing a vent pipe boot, which is a very common leak source, typically costs 200 to 500 dollars. Repairing or replacing step flashing along a sidewall or chimney can cost 500 to 1,500 dollars depending on length and whether shingles must be removed and reinstalled to integrate new flashing properly. Valley flashing replacement on a 20-foot valley may cost 400 to 1,000 dollars. Full chimney flashing replacement including both step flashing and counter flashing cut into mortar joints is more labor intensive and typically costs 1,000 to 2,500 dollars. Costs are higher for steep roofs, multi-story homes, and complex roofs with many penetrations, as safety equipment and additional labor are required. Copper flashing costs 2 to 3 times more than galvanized steel but lasts much longer. If you are replacing the entire roof, flashing replacement is usually included in the total cost of 10,000 to 20,000 dollars for an average home. Always get written estimates from licensed roofers and ensure new flashing is included.