Mississippi pricing

Air Duct Replacement Cost Calculator — Mississippi

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 Mississippi labor and material pricing.

Verified August 2026

Does ductwork replacement cost cost more in Mississippi?

-15% versus the national baseline

The six coastal counties carry wind-borne debris and elevation rules; much of the interior has minimal residential permitting, which is the biggest single cost split in the state. Permit fees here run about -20% off the national average, and Homeowner permits widely allowed

Conditioned area(sq ft)

Cost per square foot($)

Supply runs

Cost per run($)

Access

Permit fee($)

Estimated total cost

$6,031 – $8,565

Cost per square foot: $3
Cost per supply run: $685

Estimates only. Local pricing, site conditions and code requirements change the real number.

What changes the number in Mississippi

Local cost indexBelow the national baseline	0.85x national
Permit fee index	0.80x national
Code basisAdopted locally	Local adoption of the IRC; coastal counties enforce wind requirements
Owner-builder posture	Homeowner permits widely allowed
Largest markets	Jackson, Gulfport, Hattiesburg

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

Mississippi State Fire Marshal

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.