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.

Model reviewed August 2026

Does ductwork replacement cost cost more in Illinois?

+9% versus the national baseline

Installed prices in Illinois run about 9% above the national baseline. Permit fees are about 10% higher than the national average. Homeowner permits allowed in most jurisdictions, restricted in Chicago.

Chicago runs its own building code and licensed-trade requirements distinct from the rest of Illinois, so city and suburban pricing diverge substantially.

Compare with the national average ductwork replacement cost calculator.

Conditioned area(sq ft)

Cost per square foot($)

Supply runs

Cost per run($)

Access

Permit fee($)

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.

Covered markets in Illinois

City-level cost and permit pages with local building department links.

Chicago, IL Aurora, IL Naperville, IL Joliet, IL Rockford, IL Springfield, IL Elgin, IL Peoria, IL Champaign, IL Evanston, IL

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

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.