HVAC Cost Guide
Ductwork Replacement Cost
Ductwork moves conditioned air through the home. New HVAC equipment cannot perform well if ducts are undersized, disconnected, crushed, leaky, dirty, or poorly insulated.
Cost planning ranges
Ductwork cost varies widely because access is everything. Open basements and attics are easier than finished ceilings, tight crawlspaces, or multi-story homes. These figures are planning ranges, not contractor quotes. Final pricing depends on the home, materials, labor, access, permits, and the written scope.
For broader planning, compare the HVAC hub and calculator, AC replacement cost guide, furnace replacement cost guide, heat pump replacement cost guide, HVAC sizing guide, and HVAC financing guide.
Duct sealing or repair
$300-$1,500+
Localized leaks, disconnected runs, or minor airflow corrections.
Partial duct replacement
$1,500-$5,000+
Replacing problem runs, returns, plenums, or damaged sections.
Whole-home ductwork
$5,000-$15,000+
Typical planning range for many homes with accessible ducts.
Complex duct redesign
$12,000-$25,000+
Finished spaces, zoning, major return changes, or difficult access can raise cost.
What affects the price?
Good estimates explain the scope and assumptions, not just the total. Use these factors to compare written quotes more clearly.
Home size, number of levels, and room layout
Attic, basement, crawlspace, chase, or finished-ceiling access
Supply and return sizing, static pressure, and airflow balance
Sheet metal, flex duct, insulation, sealing, and registers
Zoning, additions, finished basements, and comfort complaints
Whether ductwork is bundled with HVAC replacement
Repair ducts or replace them?
Not every old duct system needs replacement. The decision should be based on airflow testing, visible condition, comfort issues, and equipment requirements.
Repair may fit when
Repair or sealing may be enough for a few disconnected, leaky, or poorly insulated runs.
Replacement may fit when
Replacement may be needed for undersized trunks, missing returns, collapsed ducts, contaminated ductboard, or major redesign needs.
Compare Scope Before Price
Get estimates with the same details in writing
Use this guide to organize questions, then request local estimates that spell out materials, labor, permits, warranty, and exclusions.
Ductwork estimate checklist
Keep notes from each contractor in the same format. It makes pricing, warranty, timeline, and scope differences easier to spot.
Ask what airflow problem the duct proposal solves
Confirm supply and return changes, not just visible ducts
Review insulation, sealing, register, and grille details
Ask whether walls or ceilings must be opened
Compare ductwork scope separately from equipment cost
Request startup testing or airflow verification when appropriate
HVAC Resources
Related guides and calculators
Keep the next step close, whether you are comparing costs, system choices, warranties, or local estimates.
Ductwork Replacement Cost FAQ
How much does ductwork replacement cost?
Partial ductwork may cost $1,500 to $5,000 or more, while whole-home replacement often ranges from $5,000 to $15,000 or higher. Access, home size, and redesign complexity are major cost drivers.
Do I need new ducts with a new HVAC system?
Not always. Duct repair or replacement may be needed if ducts are undersized, damaged, leaky, poorly insulated, disconnected, or causing major comfort differences.
Can duct sealing improve comfort?
Yes, if leaks are a major issue. Sealing can improve delivered airflow and reduce energy waste, but it will not fix every sizing or design problem.
Why are some rooms hotter or colder than others?
Uneven rooms can come from duct sizing, return-air problems, insulation, window exposure, equipment sizing, closed doors, or air leakage. A contractor should diagnose the cause before recommending equipment alone.
Is duct cleaning the same as duct replacement?
No. Cleaning addresses debris inside ducts. Replacement or repair addresses damaged, poorly designed, leaky, or undersized duct systems.
Next Step
Compare HVAC estimates
Return to the estimate form or use the HVAC calculator to organize the project before comparing quotes.