How much does attic ventilation cost as part of a roof job?
Short answer. On a roof replacement, attic ventilation usually adds a modest amount, because the ridge cap is coming off anyway and vents are installed as the crew shingles; the estimate typically lists ridge vent by the linear foot and other vents by the piece. As a separate retrofit, the same work costs more because of access, patching, and minimum charges.
How ventilation appears on an estimate
- Ridge vent: priced per linear foot, often including slot cutting, with cap shingles listed separately.
- Remove and replace box vents or turbines: priced per vent, sometimes in metal or plastic options.
- Power fans: removal, replacement, or detach and reset, with any electrical work noted.
- Intake: edge intake vents for homes without soffit venting, priced by the foot.
- Patching: decking and shingles where old vents are removed and not replaced.
Why it is cheaper during a replacement
The crew already has the roof open, safety equipment set up, and materials on site. There are no rewoven patches to blend into old shingles, because everything is new. That is why most roofers recommend fixing ventilation at replacement time rather than as a stand-alone project.
Insurance and code
If a storm damaged your vents along with the shingles, the vents are normally part of the roof scope in a covered claim. If your local building department requires ventilation upgrades on a reroof, the extra cost may fall under ordinance or law coverage, depending on your policy; see how code upgrade coverage works.
What to ask your roofer
- How did you calculate the vent area for my attic?
- Which exhaust type are you using, and are you closing the others?
- Is there enough intake, and if not, how will you add it?
See roof replacement cost in Georgia and roof ventilation basics.