Replacing air ducts in a house typically costs $2,500-$7,500, with an average near $4,500 for a typical single-family home. The final price depends on duct length and accessibility, material, labor rates, and whether old ducts or damaged insulation must be removed.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Whole-house duct replacement | $2,500 | $4,500 | $7,500 | Typical 1,500-2,000 sq ft home |
| Ductwork per square foot of home | $1.50 | $3.00 | $5.00 | Price varies with layout and access |
| Flexible duct per linear foot | $10 | $18 | $30 | Installed, including ordinary labor |
| Sheet-metal duct per linear foot | $20 | $35 | $55 | Installed; fittings may cost extra |
Typical House Duct Replacement Prices by Home Size
For a straightforward replacement using standard flexible duct, a 1,000-1,200 sq ft home may cost $1,800-$4,000. A 1,500-2,000 sq ft house commonly falls between $3,000 and $6,500, while a 2,500-3,000 sq ft home can reach $5,000-$10,000 when it needs more branches or difficult attic and crawl-space work.
A practical planning range is $2-$4 per square foot of home for an accessible, typical installation. That is a budgeting shortcut, not a measured duct-area rate; unusual layouts and premium materials can exceed it. Assumptions: standard residential system, ordinary access, no major framing changes, and regional labor near the U.S. middle.
What Duct Materials and Labor Add to the Quote
Contractor estimates may combine materials and labor into one installed price. Asking for an itemized quote helps show whether removal, insulation, fittings, sealing, and disposal are included. These ranges are common planning figures, not fixed national rates.
| Quote item | Typical price | What it covers | Price can rise when |
|---|---|---|---|
| Flexible duct | $10-$30 per linear ft | Duct, connections, installation | Runs are long or access is tight |
| Sheet-metal duct | $20-$55 per linear ft | Metal sections and installation | Custom fittings or fabrication are needed |
| Labor | $75-$125 per worker-hour | Removal, fitting, sealing | Work requires extra crew time |
| Old duct removal | $300-$1,500 per job | Take-down and disposal | Ducts are contaminated or hard to reach |
| Sealing and insulation | $300-$1,200 per job | Sealing joints and insulating runs | Code or climate needs call for more insulation |
Labor and removal can account for a substantial share of the total. For example, 24-40 worker-hours at $75-$125 per hour equals $1,800-$5,000 in labor before materials and disposal.
How Duct Length, System Size, and Access Change the Price
More duct runs and longer branches require additional material, hangers, fittings, and sealing. A home with 150-250 linear feet of accessible duct may stay near the lower range; a layout exceeding 300 feet can push costs upward, especially if it serves multiple floors or has many registers.
Access often matters as much as home size. Replacing ducts in an open basement is generally less labor-intensive than work in a low crawl space or a finished ceiling. A system serving a 2,000 sq ft home may cost more than one serving a larger home if the duct route is cramped, damaged, or difficult to reach. Duct sizing should match the HVAC system and room airflow needs rather than simply copying the old layout.
When Attic or Crawl-Space Labor Takes Longer
A basic accessible job may take a two- or three-person crew one to three days. Tight crawl spaces, multiple floors, duct rerouting, or ceiling access can extend the work to three to five days and raise labor charges. Contractors may price the job by project rather than disclose individual hourly rates.
Ask how many crew days are included and what conditions trigger extra charges. A written estimate should specify the duct runs being replaced, sealing method, insulation level, and any patching excluded from the bid. Drywall repair and repainting are often separate trades and may add several hundred dollars or more.
Regional Duct Replacement Rates from Rural to Urban Areas
Labor and contractor availability can shift installed quotes by roughly 10%-25% compared with national middle-of-market pricing. Large metropolitan areas and high-cost coastal markets may land 10%-25% above the ranges shown, while some rural markets may be 5%-15% below them. Remote locations can cost more if crews travel far or materials require special delivery.
Compare local quotes using the same scope, not just the bottom-line total. Differences in insulation, duct material, access assumptions, disposal, and warranty can explain a large price gap. Regional ranges are broad estimates; local bids are more useful for a final budget.
Removal, Insulation, and Repairs That Raise the Total
Old duct removal may be included, charged separately, or omitted when new ducts can use the existing routes. Mold remediation, pest damage, wet insulation, or asbestos-containing materials require specialized assessment and can add substantial expense. Asbestos work should be handled by qualified professionals rather than treated as ordinary duct disposal.
Confirm whether the quote includes old-duct disposal and insulation upgrades. Replacing a return-air plenum, adding access panels, repairing supports, or sealing leaks in connected sections can each change the total. Permits and inspections depend on local rules and the project scope; ask the contractor whether they are required and included.
Three House Layouts and Their Likely Installed Quotes
A 1,200 sq ft ranch with 160 linear feet of flexible duct and open attic access may total $2,400-$4,200, including routine removal and sealing. A 1,900 sq ft two-story home with 240 feet of duct and moderate crawl-space access may run $4,000-$7,000. A 2,700 sq ft home needing 330 feet of sheet-metal duct, custom fittings, and difficult access may cost $8,000-$13,000.
These examples show how scope and material can outweigh square footage alone. The estimates assume ordinary residential work and no major HVAC replacement, extensive framing, or hazardous-material remediation. Local labor and taxes may change the totals.
Ways to Control the Duct Replacement Budget
Request at least three written estimates based on the same duct map, material, insulation, removal, and sealing scope. Ask whether partial replacement is appropriate if only a few runs are damaged, but have an HVAC professional check airflow and system sizing before keeping old sections. Replacing everything is not automatically necessary when the remaining ducts are sound.
Control the scope before choosing a lower grade of duct. Clear stored items near attic or crawl-space access, schedule non-emergency work when contractors are less booked, and avoid add-ons that do not address a documented problem. Compare warranties and workmanship details alongside price, and get any change orders approved in writing before work begins.