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Attic duct replacement cost calculator
Attic ductwork replacement cost depends on home size, attic temperature and clearance, the number of supply and return runs, insulation value, access platforms, and whether old ducts can be removed without opening finished ceilings.
Direct answer
$4,000-$13,000+
A partial attic duct replacement can start near $1,800-$5,500, while a full-home redesign commonly reaches $4,000-$13,000 or more. Low-clearance attics, multiple returns, damaged insulation, and difficult removal push the quote higher.
| Scope | Planning range | What the quote should explain |
|---|---|---|
| One or two damaged attic runs | $1,800-$4,500 | Affected footage, matching duct size, insulation, hangers, sealing, removal, and airflow check. |
| Partial attic duct replacement | $3,000-$7,500 | Several branches or one trunk/return section, insulation, access labor, sealing, and balancing. |
| Full attic duct replacement | $4,000-$13,000+ | Room-by-room layout, supplies, returns, plenums, insulation, registers, removal, testing, and permit assumptions. |
| Cost factor | Lower-cost condition | Higher-cost condition |
|---|---|---|
| Attic clearance | Walkable or open work area | Low clearance, steep roofline, or restricted work zones |
| Temperature and scheduling | Cool-season access | Peak-summer work or limited safe work hours |
| Duct layout | Short, direct runs with adequate returns | Long runs, zoning, multiple plenums, or return redesign |
| Insulation and removal | Clean access and reusable surrounding insulation | Buried ducts, damaged insulation, difficult disposal, or ceiling protection |
A broad planning range is about $4,000-$13,000 or more for full attic duct replacement, with partial work often around $1,800-$7,500. Home size, clearance, layout, return-air changes, insulation, and removal conditions determine the actual bid.
It can be. Restricted clearance, high temperatures, buried ducts, complex returns, and the need to protect ceilings or insulation can add labor compared with accessible basement or utility-room ducts.
Repair can fit an isolated loose joint, tear, or short damaged branch. Widespread leakage, crushed runs, missing insulation, poor sizing, or a flawed return layout may justify partial or full replacement after airflow testing.
It should identify material, size, footage, supplies, returns, insulation, hangers, sealing, old-duct removal, access assumptions, balancing, leakage or airflow testing, exclusions, permits, and warranty.
Clear HVAC Costs models duct replacement from home size, partial or full scope, installation location, access difficulty, return-air work, and insulation. Results are U.S. homeowner planning ranges, not bids. Compare at least three written contractor quotes. Last updated September 7, 2026.