How much does roof flashing repair cost?
Short answer. Small flashing repairs, like resealing counterflashing or refastening a loose piece, are usually modest jobs in the low hundreds of dollars, while replacing step flashing along a wall or reflashing a chimney costs more because shingles, and sometimes siding or mortar joints, have to be opened and rebuilt. The biggest cost drivers are which flashing it is, the roof's pitch and height, and any rotted wood found underneath.
From simplest to most involved
- Resealing exposed nails or a counterflashing joint.
- Replacing a pipe boot.
- Adding a kickout flashing at a roof to wall corner, which means opening the siding.
- Replacing step flashing along a sidewall, which means removing shingles and usually a course of siding.
- Reflashing a chimney with a new apron, steps, counterflashing and back pan, and sometimes building a cricket.
- Reflashing a skylight, sometimes with a new unit.
What pushes the price up
- Steep or two-story roofs that need more safety setup and time.
- Siding that is hard to remove without breaking, such as older fiber cement or stucco.
- Rotted sheathing or framing behind flashing that leaked for a long time.
- Copper or custom-bent metal instead of standard galvanized or aluminum.
- Masonry work, such as cutting new reglets or repointing joints.
When to fold it into a replacement
If the shingles are near the end of their life, paying to remove and rebuild them around new flashing now, and again in a few years, costs more than doing both at once. All flashing should be replaced during a reroof anyway, so ask for a replacement price before approving a big flashing job on an old roof.
See roof flashing explained and roof replacement cost in Georgia.