Full duct replacement in an average home runs $3,000–$7,000. Larger homes, hard-to-reach attics, or upgrades to sealed/insulated ducts push higher. Ductwork is the #1 hidden cost in 'cheap' system quotes.
What drives the price
Home square footage and layout
Attic/crawlspace accessibility
Flex vs rigid metal duct
Sealing and insulation level
Red flags in a quote
System quote that ignores ducts entirely
'Your ducts are fine' with no inspection
No mention of sealing or R-value
Price per vent that seems too neat
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Typical US ranges; your market varies. Always get 2–3 competing quotes.