Illinois pricing
Air Duct Replacement Cost Calculator — Illinois
Estimate duct replacement cost from your home's size, run count and how hard the attic or crawlspace is to work in. Every figure below is already adjusted for Illinois labor and material pricing.
Verified August 2026
Does ductwork replacement cost cost more in Illinois?
+9% versus the national baseline
Estimated total cost
$7,734 – $10,984
- Cost per square foot
- $4
- Cost per supply run
- $879
Estimates only. Local pricing, site conditions and code requirements change the real number.
What changes the number in Illinois
| Local cost indexAbove the national baseline | 1.09x national |
|---|---|
| Permit fee index | 1.10x national |
| Code basisAdopted locally | Local adoption of the IRC; statewide plumbing and energy codes apply |
| Owner-builder posture | Homeowner permits allowed in most jurisdictions, restricted in Chicago |
| Largest markets | Chicago, Aurora, Naperville, Rockford |
The formula
Cost = (sq ft x rate) + (runs x per-run cost) x access multiplier + permit
Duct replacement is priced mostly by labor hours. Tight crawlspaces and low attics can add 30–50% over an open, walkable space.
Frequently asked questions
How much does it cost to replace ductwork?
Whole-home duct replacement usually runs $3,500 to $12,000 in 2026, or roughly $2 to $4 per conditioned square foot.
Should I replace ducts with the HVAC system?
If ducts are over 20 years old, undersized or badly leaking, doing both at once saves labor and protects the new system's efficiency rating.
Sources
Sources & verification
Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.