Ductwork replacement cost commonly ranges from $1,400 to $5,600, according to HomeGuide’s published national estimates. The same guide lists approximately $25 to $55 per linear foot for replacement work.
Your actual price depends on which ducts need replacement, their location, access and the proposed design. A project involving selected accessible runs differs from replacing concealed supply and return ducts throughout a home.
Before accepting a replacement quote, ask the contractor to identify the problem and explain whether repair, sealing or partial replacement could address it.
Ductwork Replacement Cost at a Glance
| Scope | Published price reference |
|---|---|
| Ductwork replacement | $1,400–$5,600 |
| Replacement per linear foot | $25–$55 |
| Replacement per duct run | $270–$500 |
| New duct installation in a home without ducts | $2,400–$6,600 |
These references come from HomeGuide’s ductwork guide, reviewed in October 2026. They are alternative ways of describing projects, not separate charges to add together.
Ask what a “duct run” includes and how linear footage is measured. Confirm whether the price covers supply ducts, return ducts, removal, insulation and finishing.
A quoted national range does not establish a maximum price for your property.
Does Your Home Need Duct Replacement?
Start with an assessment rather than assuming that uncomfortable rooms require new ducts.
ENERGY STAR recommends that contractors inspect the whole duct system, evaluate supply and return balance, and address damaged, disconnected or crushed ducts.
Ask the contractor to document the findings and distinguish between:
- A connection requiring repair.
- A section needing replacement.
- Leakage requiring sealing.
- Insulation needing improvement.
- A layout or sizing problem requiring redesign.
Request photographs where access is difficult.
The proposed work should explain which findings it addresses. Avoid accepting “old ductwork” as the only explanation for a complete replacement.
Repair, Partial Replacement or Full Replacement?
Repair and Sealing
Ask whether existing serviceable ducts can remain.
Request a written repair scope identifying the affected connections, sealing work, insulation repairs and checks afterward.
Partial Replacement
A partial proposal should identify every section being replaced and the ducts remaining in place.
Ask how new sections will connect to existing ducts and how the contractor will evaluate the completed system.
Complete Replacement
For complete replacement, request a layout showing the proposed supply and return arrangement.
The quote should specify materials, dimensions, insulation and connections. Confirm whether existing registers, boots, plenums and other components will remain or be replaced.
Do not assume “replace all ductwork” includes every associated component.
What Changes Ductwork Replacement Cost?
Location and Access
Ask the contractor to describe where the ducts run and how workers will reach them.
Attic, crawl-space and concealed-wall work can create different access requirements. Confirm whether cutting and restoring walls or ceilings is included.
If ducts are in a crawl space, ask whether conditions there need attention before installation. Our crawl space encapsulation cost guide provides budgeting context if a separate moisture-control project is recommended.
Length and Number of Runs
Request the measured footage and a list of the runs covered.
A quote for several branch ducts should not be compared directly with one that includes main ducts and return-air work.
Ask both contractors to identify the same scope before comparing totals.
Materials and Insulation
Request the proposed duct material and exact insulation specification.
Ask how the selected product will be installed, supported and connected. Product selection and installation should suit the proposed layout.
ENERGY STAR recommends insulating ducts in unconditioned areas. Confirm the applicable requirements for your project rather than assuming that every location needs the same specification.
Changes to the Layout
If the contractor recommends larger ducts, additional returns or different routes, ask what assessment supports the change.
Request an explanation of the intended improvement and how it will be checked after installation.
Removal and Finish Repairs
Ask whether the price includes:
- Removing and disposing of old ducts.
- Replacing associated fittings and connections.
- Sealing and insulating the new work.
- Access openings and surface restoration.
- Permit requirements, where applicable.
- Cleanup and completion checks.
Keep excluded work visible in the estimate.
Five Duct and Insulation Suppliers to Research
Ductwork is often assembled or fabricated by the contractor. Homeowners should therefore compare the complete design and installation, alongside product names.
These companies provide relevant duct or insulation products. They are research references, not a ranking of installers.
| Company | Product category to investigate |
|---|---|
| ATCO Rubber Products | Flexible duct systems |
| Thermaflex | Residential flexible ducts |
| Owens Corning | HVAC duct insulation products |
| Johns Manville | HVAC insulation products |
| Knauf Insulation | Insulation products appropriate to the specified duct application |
Ask the contractor to identify the exact products being supplied and provide relevant installation information.
The companies do not all supply the same components. Confirm that the proposed product is appropriate for the intended application.
Compare the Complete Quote
This example is fictional and demonstrates the calculation. It is not a local price estimate.
Assume both contractors propose the same replacement scope and material specification.
| Item | Contractor A | Contractor B |
|---|---|---|
| Duct replacement | $3,200 | $4,000 |
| Old-duct removal and disposal | $250 | Included |
| Specified insulation work | $400 | Included |
| Defined completion testing | $200 | Included |
| Comparable total | $4,050 | $4,000 |
Contractor A initially appears $800 cheaper. After adding the listed work, Contractor B is $50 cheaper.
Next compare exclusions, warranties and the checks each contractor will perform. If the proposed replacement scope differs, resolve that difference before selecting a contractor.
Use our contractor-hiring guide when checking references and written agreements.
Questions to Ask Before Signing
- What findings support replacement?
- Could repair or partial replacement solve the problem?
- Which supply and return ducts are included?
- What footage, materials and insulation are specified?
- Which existing components will remain?
- What access and surface repairs are included?
- How will the ducts be supported and connected?
- What permits or inspections apply?
- What airflow or leakage checks will you perform?
- What workmanship warranty applies?
Ask for the answers in writing.
If the project also includes new heating or cooling equipment, request separate prices. Our air conditioner replacement cost guide can help you assess that additional scope.
Check the Work at Completion
Ask the contractor to explain the completed work and provide photographs of inaccessible areas.
- Confirm the agreed sections were replaced.
- Review the installed materials and insulation.
- Check that included connections and sealing are complete.
- Confirm access openings and finish repairs were addressed.
- Request the agreed testing results.
- Ask how airflow was evaluated.
- Discuss any remaining room-comfort problems.
- Collect warranty and inspection documents.
Where gas or oil-burning appliances are present, ask the contractor about applicable combustion-safety checks after duct improvements. ENERGY STAR includes this consideration in its contractor guidance.
Record unfinished items and agree on their resolution under your contract.
Your Next Step as a Homeowner
List the rooms with comfort problems and describe when those problems occur.
Arrange a duct-system assessment, then request two or three itemized proposals for comparable work.
Compare the replacement boundaries, insulation, access repairs and completion checks before comparing prices. A clear scope makes the final cost easier to understand and reduces uncertainty during installation.
Frequently Asked Questions
How much does ductwork replacement cost?
HomeGuide’s published national reference is approximately $1,400–$5,600. Location, access, materials and the extent of replacement affect local quotes.
Must ducts be replaced when an air conditioner is replaced?
Ask the contractor to assess their condition and suitability for the proposed equipment. Request a separate explanation and price for any recommended duct work.
Can only damaged sections be replaced?
Ask whether partial replacement is appropriate and how the new sections will connect to the remaining system.
Does duct cleaning replace the need for repairs?
Ask the contractor to distinguish cleaning from repairing physical damage, disconnected sections or design problems. Require a scope addressing the findings.
Will replacement guarantee lower bills?
Actual results depend on existing conditions, installation, equipment, weather and use. Ask for the assumptions supporting any projected savings.
Editorial Note
This guide uses published national price references and official product information reviewed in October 2026. Actual costs depend on property conditions and installation scope. The quote comparison is fictional, and supplier inclusion is not an endorsement. Obtain written estimates before committing.
Sources and Supplier References
HomeGuide — Ductwork Replacement Cost
ENERGY STAR — Professional Duct Improvement Projects
Thermaflex — Residential Flexible Ducts
Owens Corning — HVAC Insulation
Johns Manville — HVAC Insulation
Knauf Insulation — Product Information