Redoing ductwork typically costs $2,500-$7,500 for a standard home, with complex or large projects reaching $15,000 or more. The cost to redo ductwork depends mainly on home size, duct material, how much of the system is replaced, access, and local labor rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Whole-home ductwork replacement | $2,000 | $5,500 | $15,000+ | Typical range for a house with about 1,500-2,500 sq. ft. |
| Flexible duct installation | $10 per linear ft | $18 per linear ft | $30 per linear ft | Material and installation, depending on access |
| Sheet-metal duct installation | $15 per linear ft | $25 per linear ft | $40+ per linear ft | Custom fabrication and fittings can raise the rate |
| Partial replacement | $500 | $1,800 | $4,000 | Several damaged runs or a limited zone |
Assumptions: U.S. home, standard-quality materials, no major asbestos abatement or structural reconstruction.
What a Whole-Home Duct Replacement Usually Costs
A complete redo for a typical 1,500-2,500-square-foot home often lands between $3,000 and $8,000. Smaller homes with accessible attic or basement runs may cost closer to $2,000-$4,000, while larger houses, multiple floors, or difficult routing can push the bill to $10,000-$15,000 or more.
Contractors may quote by linear foot, by duct run, or as a whole project. A rough installed allowance is $10-$30 per linear foot for flexible duct and $15-$40 or more for sheet metal. These rates can include different amounts of fittings, insulation, sealing, and labor, so the scope matters as much as the unit price.
For budgeting, $5,500 is a reasonable midpoint for a standard whole-home replacement, not a guaranteed national price. A quote should state whether it includes supply and return ducts, plenums, registers, balancing, and removal of old material.
How Duct Materials, Labor, and Removal Shape the Quote
Labor and access often account for a substantial share of the estimate. The table gives broad installed-price ranges; line items can overlap because contractors package labor and materials differently.
| Quote item | Low | Average | High |
|---|---|---|---|
| Flexible duct and fittings | $10 per linear ft | $18 per linear ft | $30 per linear ft |
| Sheet-metal duct and fittings | $15 per linear ft | $25 per linear ft | $40+ per linear ft |
| Installation labor | $75 per hour | $100 per hour | $150 per hour |
| Old duct removal and disposal | $200 | $600 | $1,500 |
| Testing, sealing, and balancing | $150 | $450 | $1,000 |
Labor commonly takes 1-3 days for a straightforward replacement, while extensive work can take longer. A crew of two working 16-32 total crew-hours at $75-$150 per hour would imply roughly $1,200-$4,800 in labor before considering how the contractor calculates crew time and overhead.
Ask for material, labor, removal, and testing to be described separately so competing bids cover comparable work.
Why House Size, Duct Length, and Access Change the Price
More conditioned floor area usually means more duct runs, branches, and registers. A 1,000-square-foot home may need a limited network, while a 3,000-square-foot home can require substantially more material and installation time. The number of floors and the distance between the air handler and rooms also affect layout and labor.
Access can change the quote sharply: open basement ceilings are typically easier to work in than cramped crawl spaces or finished ceilings that must be opened and repaired. A run longer than about 25-30 feet may need additional sizing attention to manage airflow and static pressure. Oversized or undersized ducts can cause comfort problems even if the materials are new.
Material and insulation requirements matter as well. Flexible duct is often less expensive and quicker to route, while sheet metal can cost more, especially when custom bends or transitions are needed. In unconditioned attics, code and climate requirements may call for insulated duct and careful sealing.
Home square footage alone does not determine the estimate; duct length, system design, and access are major pricing variables.
When Do Extra Duct Runs or Code Repairs Add Charges?
Replacing a few accessible runs may cost $500-$4,000, but additions can change a partial job into a larger project. Reworking a return-air path, adding branches to rooms, or replacing a damaged plenum can add several hundred to a few thousand dollars, depending on the amount of new duct and the access required.
Removal is usually a separate consideration when old ducts are dirty, crushed, contaminated, or difficult to reach. Opening and patching drywall, moving stored items, repairing insulation, or clearing a crawl space may also be excluded from the HVAC bid. If suspect asbestos-containing material is present, testing and abatement require qualified professionals and can add significant expense.
Confirm in writing whether demolition, disposal, drywall repair, and permit or inspection fees are included.
What Three Common Ductwork Quotes Might Include
A limited repair in a 1,200-square-foot home might replace 40 linear feet of flexible duct at $12-$25 per foot, plus labor and testing. A plausible total is $900-$2,000, assuming open attic access and no major changes to the layout.
A standard redo in a 1,800-square-foot, one-story home might replace 180-250 linear feet of insulated flexible duct, several plenums, and registers. With a two-person crew working about 24-40 crew-hours, a typical quote could fall around $4,000-$8,000, depending on removal and sealing.
A 3,000-square-foot, two-story home with tight chases and sheet-metal trunk lines may require custom fittings and additional labor. A quote of $9,000-$16,000 or more can be plausible, especially if access openings or duct redesign are included.
Use these examples as scope comparisons, not fixed bids; local rates and the actual duct layout can shift totals substantially.
How Regional Labor Rates Affect Ductwork Pricing
Prices often run 10%-25% above national midrange in high-cost metropolitan areas, where wages, overhead, and scheduling demand are higher. Rural markets may be 5%-15% below the midpoint, although fewer available contractors or long travel distances can erase that difference.
Climate and local codes also influence material choices and labor. Hot or cold regions may require more insulation for ducts outside conditioned space, while local requirements can affect sealing, testing, and permits. A quote should identify the required duct insulation and any inspection fees rather than assuming one standard applies everywhere.
Compare estimates from contractors serving the same area and check that each includes equivalent insulation, testing, and removal.
How to Lower a Ductwork Redo Quote Without Cutting Performance
First, ask whether the full system needs replacement. If inspection finds only a few disconnected, crushed, or leaking runs, repairing those sections may cost far less than replacing every branch. However, widespread deterioration, contamination, or poor sizing can make a larger redesign more practical.
Keep the scope focused by preserving usable routes, clearing attic or basement access before work begins, and avoiding unnecessary register relocations. Compare flexible duct with sheet metal based on layout and durability needs, not material price alone. Request at least three written estimates that specify duct length, material, insulation, removal, sealing, and airflow testing.
Scheduling during a contractor’s less-busy period may improve availability, but urgent work during extreme heating or cooling weather can limit options. Avoid choosing a bid solely because it is the lowest; omitted return ducts, inadequate insulation, or no testing can lead to added charges or poor comfort later.
The most reliable savings come from replacing only what the inspection supports and comparing bids with matching scopes.