Is flashing expensive to replace?

Flashing replacement is not excessively expensive compared to full roof replacement, but cost varies significantly based on type and extent, and it is a critical investment for preventing leaks. For small flashing repairs like replacing a single vent pipe boot, cost is typically 200 to 500 dollars including labor and materials, which is relatively affordable. Replacing step flashing along a 10-foot sidewall section averages 400 to 900 dollars, as it requires removing surrounding shingles, installing new flashing interwoven with shingles, and reinstalling shingles. Valley flashing replacement for a 20-foot valley averages 500 to 1,200 dollars. Full chimney flashing replacement including step flashing and counter flashing cut into mortar joints is more labor intensive and averages 1,200 to 2,500 dollars. Material choice affects cost, as copper flashing costs 2 to 3 times more than galvanized steel or aluminum but lasts 50 to 100 years versus 15 to 25 years. When replacing an entire roof, new flashing is normally included in the total cost of 10,000 to 20,000 dollars for an average home, representing about 5 to 10 percent of total cost. While not cheap, flashing replacement is essential, as reusing old flashing to save money often leads to leaks that cause far more expensive interior damage. Properly installed flashing prevents costly repairs later.