Realistic whole-home, linear-foot and home-size planning ranges—plus the tests that show whether you need replacement, repair or sealing.
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Estimate a planning range from conditioned floor area, the share being replaced, accessibility, material and restoration work.
Instant result · no email requiredA measured duct design, fitting count, insulation level, code requirements, hazardous-material procedures and air-balancing scope supersede this floor-area estimate.
Plan on about $3,000–$10,000 for complete ductwork replacement in many US homes. A compact single-story house with accessible attic or basement runs can land below that range. A large or multi-story home, tight crawlspace, custom sheet metal, zoning, new return paths, remediation or extensive finish repairs can exceed $10,000.
For early takeoffs, $12–$25 per linear foot installed is a usable—but incomplete—planning band. A duct system is not priced like pipe alone: plenums, boots, takeoffs, dampers, hangers, insulation, sealing, demolition, access and testing are concentrated costs that do not scale evenly with length.
| Replacement scope | Editorial 2026 planning range | Typical situation |
|---|---|---|
| Targeted branch replacement | $500–$2,000 | One damaged, crushed or disconnected area |
| Small accessible home | $2,000–$5,000 | Short runs, open attic or basement access |
| Typical whole-home replacement | $3,000–$10,000 | Supplies, returns, insulation and sealing |
| Large or difficult-access home | $8,000–$15,000+ | Multiple floors, crawlspace or finish repair |
| Duct replacement with new HVAC | $12,000–$25,000+ | Designed distribution plus matched equipment |
The last row includes HVAC equipment. Keep the duct scope separate when comparing it with our new AC installation prices.
Square footage helps establish a budget, but it does not reveal the number of branches, equipment location or access. A 2,000-square-foot ranch with an open attic can cost less than a 1,400-square-foot two-story home whose ducts cross finished ceilings.
| Conditioned floor area | Early whole-home budget | Do not assume |
|---|---|---|
| Up to about 1,200 sq ft | $2,000–$6,000 | That every run is accessible |
| About 1,200–1,800 sq ft | $3,000–$8,000 | That one central return is adequate |
| About 1,800–2,500 sq ft | $4,000–$10,000 | That existing sizes can be copied |
| About 2,500–3,500 sq ft | $6,000–$15,000+ | That one system serves every zone well |
A practical first budget is $4,000–$10,000, but do not accept a price based on floor area alone. The contractor should inspect the whole route, calculate room-by-room airflow, identify every supply and return, specify material and insulation, and state which walls or ceilings must be opened and restored.
Access. Open basements and stand-up attics are faster than low crawlspaces, truss-packed roofs and finished chases. Access may determine more of the labor bill than material.
Material. Flexible duct is economical and useful when correctly sized, supported and kept reasonably straight. Rigid round or rectangular metal costs more to fabricate and install but can offer durable, low-resistance runs. Fiberglass duct board is another regional option. The design matters more than a blanket claim that one material is always best.
Insulation and climate zone. Ducts outside the conditioned envelope need insulation appropriate to local code and condensation risk. Damaged vapor barriers in humid climates can create wet insulation and ceiling stains even when the metal or liner remains intact.
Supply and return design. Copying a poor layout preserves its comfort problems. Added returns, transfer paths, larger trunks, balancing dampers and revised boots cost money because they solve airflow—not because they are “extras.”
Demolition and finish repair. Clarify whether wall and ceiling openings, drywall, paint, flooring protection, cleanup and disposal are included. An HVAC quote may exclude all finish work.
Hazardous materials and contamination. Older insulation or duct materials may require asbestos testing before disturbance. Flood, sewage, mold or pest damage can require specialist remediation outside an HVAC contractor's scope.
Seal and repair when the system is fundamentally well-sized and intact but leaks at joints, boots or accessible connections. Professional sealing, mechanical fastening, mastic, insulation repair and balancing may recover performance without demolition.
Replace sections when a limited area is crushed, torn, wet or disconnected, or when one branch is clearly undersized. A targeted scope should include new connections, support and testing so the new section does not simply move the bottleneck.
Replace the system when deterioration is widespread, flexible duct has collapsed or lost its liner, metal is badly corroded, contamination cannot be cleaned safely, sizes are fundamentally wrong, or the layout cannot provide required airflow.
ENERGY STAR says typical homes lose around 20–30% of the air moving through duct systems because of leaks, holes and poor connections. That figure supports inspection and testing; it does not prove every home needs complete replacement.
Level the bids before comparing totals. A $4,000 quote that reuses plenums, returns and grilles is not cheaper than a $7,000 quote that redesigns and replaces them—it is a different project. If the ducts are being replaced with the equipment, also compare AC sizing and heat-pump installation cost.
Leakage and repair context: ENERGY STAR duct sealing guidance. Public price benchmarks were checked against current national cost pages, including Homewyse ductwork installation estimates, then expressed as broad editorial planning bands. A measured local design and quote supersedes every national range.
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A full residential ductwork replacement commonly budgets at about $3,000–$10,000. A small accessible system may be lower, while a large home, difficult crawlspace or attic, new returns, zoning, asbestos abatement or extensive drywall work can push the project to $10,000–$15,000 or more. These are editorial planning bands, not property-specific quotes.
A useful early planning range is roughly $12–$25 per linear foot installed, with simple exposed runs near the bottom and insulated, fabricated or difficult-access runs higher. Linear-foot pricing alone can mislead because plenums, boots, dampers, returns, demolition, sealing, insulation and balancing are not evenly distributed through a system.
Many 2,000-square-foot houses fall around $4,000–$10,000 for a complete replacement, but floor area is only a starting point. Two-story layouts, slab construction, tight crawlspaces, long branch runs, the number of supplies and returns, local labor and repairs to walls or ceilings can move the result substantially.
Replacement can be worthwhile when ducts are crushed, badly undersized, contaminated by flood or pests, internally deteriorated, inaccessible for durable sealing or causing severe comfort and static-pressure problems. Leaky but structurally sound ducts may need professional sealing and targeted repairs instead. Require measurements and a scope that explains why replacement beats repair.
Age alone is not a diagnosis. Metal ducts can last for decades if dry, supported, sealed and properly sized; flexible duct may sag, tear or lose insulation sooner. Have the contractor inspect accessible runs, test leakage and static pressure, and check insulation, connections and airflow before deciding.
It can when the existing system loses substantial conditioned air or draws hot, humid or polluted air from an attic, garage or crawlspace. ENERGY STAR says a typical home can lose about 20–30% of the air moving through its ducts from leaks, holes and poor connections. Actual savings depend on where the ducts are, how bad the leakage is and how the new system is designed and commissioned.
A straightforward accessible replacement often takes two to four days. Large homes, occupied commercial spaces, asbestos procedures, custom sheet metal, drywall access and air-balancing corrections can extend the work. Ask whether the estimate includes demolition, patching, cleanup, testing and return-to-service timing.