Ductwork replacement in 2026 commonly costs about $1,400 to $5,600 for many whole-home replacement projects, according to HomeGuide. Angi reports a narrower national average of about $1,250, with many verified projects between roughly $452 and $2,181. Those ranges reflect different project definitions, system sizes, materials, and scopes.
The most important question is not simply “How much does new ductwork cost?” It is what exactly is being replaced, resized, rerouted, sealed, insulated, tested, and restored. A contractor replacing two damaged branch runs is pricing a very different project from a contractor redesigning most of a home’s supply and return system.
This guide stays focused on the duct system itself: replacement signs, cost factors, materials, access, airflow, installation scope, and contractor quote comparison. If you are deciding whether to replace the furnace, air conditioner, or heat pump too, use our HVAC replacement cost guide. For equipment sizing and efficiency terminology, see our HVAC sizing and efficiency guide.
Ductwork Replacement Cost in 2026: Quick Answer
For budgeting, HomeGuide lists average residential ductwork replacement at about $1,400 to $5,600, or roughly $25 to $55 per linear foot and $270 to $500 per duct run in many crawlspace, attic, or basement projects. Its current guide lists attic replacement around $2,200 to $5,600, basement replacement around $1,800 to $3,100, and crawlspace replacement around $3,000 to $7,300.
Angi’s 2026 replacement data gives a national average near $1,250, with many projects ranging from about $452 to $2,181, while its broader new-installation guide lists $2,000 to $7,500 for installing ductwork in a new HVAC system. The difference is why homeowners should compare written scopes rather than relying on one national number.
| Planning item | Typical 2026 range | What it may represent |
|---|---|---|
| Whole-home duct replacement | $1,400–$5,600 | HomeGuide average replacement range |
| Replacement per linear foot | $25–$55 | Useful after route length and access are known |
| Replacement per duct run | $270–$500 | Useful for defined branch-run replacement |
| Attic duct replacement | $2,200–$5,600 | Access, insulation, heat, and layout affect labor |
| Basement duct replacement | $1,800–$3,100 | Often easier access than concealed or crawlspace ducts |
| Crawlspace duct replacement | $3,000–$7,300 | Tight access and crawlspace conditions can raise labor |
These are national planning figures, not a local quote. Your contractor should explain the length, number of runs, material, insulation, access conditions, removal, design changes, testing, permits, and finish repairs included in the price.
When Does Ductwork Need to Be Replaced?
Not every airflow problem means the ducts need full replacement. Some systems can be repaired, resealed, reconnected, or partially replaced. Replacement makes more sense when damage is widespread, the existing system is poorly designed, or repairing isolated areas would leave major problems behind.
- Crushed, collapsed, torn, or disconnected duct sections: Flexible ducts can sag, tear, or be damaged by storage, pests, foot traffic, or poor support.
- Corroded or deteriorated metal ducts: Rust, failed joints, or damaged sections may justify replacement instead of repeated patching.
- Severe leakage throughout the system: Multiple failed joints, boots, plenums, or inaccessible leaks can make broad replacement more practical.
- Undersized or poorly designed ducts: Ducts that cannot move the required airflow may contribute to noisy operation, comfort problems, or excessive system pressure.
- Major remodeling: New room layouts, additions, finished basements, or relocated equipment can require new routes.
- Equipment changes: A new HVAC system does not automatically require new ducts, but the existing duct system should be checked for size, leakage, return-air capacity, and compatibility.
- Contamination or material damage that cannot be reasonably corrected: The source of moisture, pests, or contamination should be solved before new ducts are installed.
Before approving a full replacement, ask the contractor to show you the problem areas. Photos, measurements, static-pressure readings, airflow data, visible damage, or documented sizing issues are more useful than a vague statement that the ducts are “old.”
Ductwork Repair vs. Replacement
Minor duct repairs often cost less than full replacement. HomeGuide’s 2026 repair data places many ductwork repairs around $200 to $1,000, depending on the repair type, material, access, and extent of damage. A loose connection, a local leak, damaged insulation, or one failed branch may not justify replacing an entire system.
- Damage is limited to one or a few accessible sections.
- The existing layout and duct sizes are otherwise appropriate.
- The system has a good return-air path and acceptable airflow.
- The duct material is still in serviceable condition.
- There is no widespread contamination, corrosion, or structural damage.
Replacement becomes more reasonable when failures are repeated or widespread, the layout is fundamentally poor, multiple runs are undersized, large sections are inaccessible, or the cost of extensive repairs approaches the cost of installing a more reliable system.
Ask for the contractor’s reasoning in writing. A useful proposal should identify which ducts can remain, which must be replaced, and why.
What Affects Ductwork Replacement Cost?
1. How Much Ductwork Is Being Replaced?
Total system length and the number of supply and return runs are major cost drivers. A partial replacement covering a few damaged branches can be much cheaper than replacing trunks, branches, returns, plenums, boots, dampers, and registers throughout the home.
2. Attic, Basement, Crawlspace, or Concealed Access
Access can change labor dramatically. Open basement ceilings are often easier to work in than tight crawlspaces or hot attics. Ducts hidden inside finished walls, soffits, chases, or ceilings may require cutting and later repairing drywall, plaster, trim, or flooring.
That restoration work is frequently priced separately, so ask whether the HVAC quote includes it.
3. Duct Material
Residential systems may use combinations of galvanized sheet metal, rigid duct board, and insulated flexible duct. Material choice should be based on the design, location, local requirements, durability, acoustics, and installer recommendations—not only the lowest material price.
Sheet metal can be durable and smooth internally, but fabrication and fitting can cost more. Flexible duct can work well when correctly sized, stretched, supported, routed, and protected, but excessive bends or sagging can restrict airflow.
4. Insulation Requirements
Ducts running through unconditioned attics, crawlspaces, garages, or other spaces may need insulation. The required insulation level and vapor control depend on location and local requirements. The quote should state whether insulation is built into the duct product or installed separately.
5. Resizing or Rerouting
Replacing old ducts “like for like” is cheaper than redesigning them, but copying a poor layout can preserve the same comfort problems. If the contractor wants to resize a trunk, add a return, relocate registers, reduce restrictive bends, or change branch sizes, ask what measurements or calculations support the change.
6. Plenums, Boots, Dampers, and Registers
The duct system is more than long tubes. Supply and return plenums, takeoffs, dampers, boots, grilles, registers, transitions, elbows, reducers, hangers, and sealants can all be part of the scope. A low quote may reuse many existing components while a higher quote replaces them.
7. Permits and Inspections
Permit requirements vary by jurisdiction. Angi’s 2026 duct-installation guide notes permit allowances of roughly $50 to $300 in some markets, but local fees can differ. Ask the contractor whether permits and inspections are included in the proposal.
8. Drywall, Ceiling, and Finish Repairs
If ducts are behind finished surfaces, opening and restoring those areas can become a significant separate cost. Determine before signing whether the HVAC contractor, a remodeling contractor, or you are responsible for patching, painting, trim, insulation, and cleanup.
Why Airflow Matters During Ductwork Replacement
Duct replacement should not be treated as a cosmetic swap. The system must deliver and return enough air for the HVAC equipment without excessive resistance or noise. Poor duct design can contribute to uneven room temperatures, weak airflow, noisy registers, long run times, and system performance problems.
Ask the contractor how the new layout will be evaluated. Depending on the project, that may include duct sizing calculations, airflow measurements, static-pressure measurements, room-by-room load information, manufacturer requirements, or balancing after installation.
This article intentionally does not try to own the broader “what size HVAC system do I need?” search intent. For that topic, use our HVAC sizing and efficiency ratings guide.
Supply Ducts and Return Ducts: Both Matter
Homeowners often focus on supply vents because they feel the heated or cooled air coming out. Return ducts are just as important because they bring air back to the equipment. A system with new supply runs but inadequate return capacity can still perform poorly.
- Supply trunks and branches
- Return trunks and branches
- Return grilles and filter location
- Supply and return plenums
- Register boots
- Dampers or balancing devices
- Transitions between equipment and ductwork
If only part of the system is being replaced, the contractor should explain how the retained sections interact with the new work.
What Should Be Included in a Ductwork Replacement Quote?
- Exact work areas: attic, basement, crawlspace, walls, floors, or specific rooms.
- Replacement quantity: approximate linear feet, number of runs, or a clearly marked plan.
- Material: sheet metal, flex, duct board, insulation level, and key product specifications.
- Supply and return scope: which parts of each system are included.
- Plenums, boots, dampers, and transitions: whether these are new or reused.
- Sealing method: how joints, seams, boots, and penetrations will be sealed.
- Support and routing: how ducts will be hung, protected, and kept from sagging or kinking.
- Testing: airflow, static pressure, balancing, leakage testing, or other closeout checks if included.
- Removal and disposal: who removes the old ducts and job debris.
- Permits: who obtains them and pays the fees.
- Restoration: drywall, ceiling, paint, flooring, insulation, or trim responsibilities.
- Warranty: workmanship warranty and any product warranty.
If two quotes differ by thousands of dollars, this checklist usually reveals why.
Typical Ductwork Replacement Process
- Inspection and diagnosis: The contractor documents damaged sections, layout concerns, access limitations, and airflow complaints.
- System planning: The replacement scope identifies which ducts stay, which are replaced, and whether sizes or routes change.
- Access preparation: Attic boards, crawlspace access, ceiling openings, stored items, or protective coverings may need to be addressed.
- Old duct removal: Failed ducts are disconnected and removed without damaging wiring, plumbing, framing, or HVAC equipment.
- New duct installation: Trunks, branches, returns, plenums, boots, dampers, fittings, supports, and insulation are installed as specified.
- Sealing and insulation: Joints are sealed and ducts in required locations are insulated.
- Testing and balancing: The contractor checks system operation and adjusts airflow where the scope includes balancing.
- Restoration and cleanup: Openings, insulation, access panels, debris, and finish work are handled according to the contract.
A smaller accessible project may be completed quickly, while a whole-home replacement involving concealed ducts, structural access, or finish restoration can take longer. HomeGuide notes many standard replacements can be completed in roughly one to two days, but that should not be treated as a guarantee for every house.
Questions to Ask an HVAC Contractor Before Replacing Ductwork
- Which exact duct sections are being replaced, and which are staying?
- Why do you recommend replacement instead of repair or sealing?
- Are any trunks, branches, or returns being resized or rerouted?
- What measurements or calculations support the proposed changes?
- What duct material and insulation level are included?
- Are supply and return ducts both included?
- Are new plenums, boots, dampers, grilles, or registers included?
- How will joints and seams be sealed?
- Will the finished system be tested for airflow, static pressure, leakage, or balance?
- Are permits, disposal, drywall repair, paint, insulation repair, and cleanup included?
- What happens if concealed damage or inaccessible sections are discovered?
- What workmanship warranty applies?
Ductwork Replacement FAQs
How much does it cost to replace ductwork in a house?
HomeGuide lists many whole-home ductwork replacement projects around $1,400 to $5,600. Angi reports a lower national average around $1,250 for its replacement-project dataset. The real cost depends on the amount of ductwork, access, materials, system design, insulation, permits, and restoration work.
How much does ductwork replacement cost per linear foot?
HomeGuide lists roughly $25 to $55 per linear foot for many residential replacement projects. Linear-foot pricing is only useful after the route, material, fittings, insulation, and access are defined.
Can I replace only part of my ductwork?
Yes. Partial replacement can make sense when damage is localized and the rest of the system is properly sized, sealed, supported, and in good condition. The contractor should explain how the new section will connect to and perform with the retained ducts.
Should ductwork be replaced when the HVAC system is replaced?
Not automatically. Existing ducts should be evaluated for size, condition, leakage, return-air capacity, and compatibility with the new equipment. If the duct system is serviceable, replacement may not be necessary.
Is flexible ductwork worse than metal ductwork?
Not inherently. Performance depends on correct sizing, routing, support, installation, insulation, and sealing. Poorly installed flex duct can sag or kink, while poorly sealed or designed metal ducts can also perform badly.
Will new ductwork fix hot and cold rooms?
It may help if the problem comes from leakage, damaged ducts, poor routing, inadequate return air, or incorrect duct sizing. Hot and cold rooms can also result from insulation, windows, solar exposure, equipment sizing, air balancing, or other building conditions, so diagnosis matters.
How long does ductwork replacement take?
Many accessible residential replacements may take roughly one to two days, but projects with difficult crawlspaces, concealed ducts, redesign, permits, or drywall restoration can take longer.
Final Ductwork Replacement Checklist
- Do I know exactly which ducts are being replaced?
- Do I understand why replacement is recommended?
- Are supply and return paths both addressed?
- Are duct sizes and route changes explained?
- Are material and insulation specifications written down?
- Are sealing, support, and testing methods defined?
- Are permits and inspections included if required?
- Are drywall, ceiling, paint, and cleanup responsibilities clear?
- Are change-order rules and warranties in writing?
When the scope is clear, ductwork quotes become much easier to compare. The goal is not simply the cheapest duct system—it is a properly installed distribution system that matches the home, the HVAC equipment, and the required airflow.
Ready to compare local HVAC project options? Visit our HVAC quote page or browse more planning resources in our HVAC Guides.
Editorial note: This article provides general planning information for U.S. homeowners. Duct design, permits, insulation requirements, testing procedures, and installation standards vary by location, equipment, and project. Request a written local scope and quote from a qualified HVAC professional.
Pricing references: Current 2026 planning ranges were cross-checked against Angi’s duct replacement cost data, Angi’s ductwork installation cost guide, and HomeGuide’s ductwork replacement cost guide. These are national planning benchmarks, not promised local prices.
