Ductwork Replacement Cost: Complete Guide

2026 Ductwork Replacement Costs

Replacing home ductwork in 2026 costs $5,000 to $12,000 for a typical 2,000 sq ft home, with most homeowners paying $6,500–$8,500. Partial replacements and targeted repairs run $1,500 to $5,000, while large homes, complex layouts, or attic work push totals past $13,000. Pricing is usually quoted per square foot of conditioned space — $3.50–$7.00 per sq ft for full replacement — or per supply run, at $150–$350 per run including labor.

What's Included in the Price

• Materials: Sheet metal or flex duct at $0.50–$1.50 per sq ft, plus fittings, tape, mastic, and hangers. Flex duct is cheaper; rigid sheet metal lasts longer and flows better.
• Labor: 60–70% of the total. Attic and crawlspace work is cheapest; replacing ducts in finished walls or under slabs adds 30–100%.
• Equipment interface: The new trunk must match your furnace/AC airflow (Manual D design) — $200–$500 in design work is common.
• Insulation: Wrapping supply ducts in unconditioned spaces adds $500–$1,500.

Repair vs. Partial vs. Full Replacement

If only a few runs are damaged (chewed by pests, crushed, disconnected), spot repair costs $150–$500 per run. If your ducts leak badly but are structurally sound, professional sealing with mastic and metal tape runs $1,500–$4,000 and can cut energy losses 20–30% — often the best value in the whole HVAC world. Full replacement makes sense when ducts are crushed, undersized, contaminated beyond cleaning, or when you're already doing a major remodel. Signs you need it: rooms that never heat or cool evenly, whistling sounds, visible sagging flex duct, rodent damage, or a blower that runs constantly without satisfying the thermostat.

Regional Price Differences

Duct labor tracks regional HVAC rates: Northeast and West Coast projects run $7–$10 per sq ft of floor area, while the South and Midwest are closer to $4–$6. Homes in hot climates also face higher stakes — leaky ducts in an attic can waste 20–30% of cooling energy, which is why southern energy audits frequently flag duct sealing as the top upgrade. In the Northeast, ducts are often in basements and crawlspaces, where replacement is easier and cheaper than attic work in the South.

Hidden Costs

• Demo and disposal: $300–$800 for removing old ducts.
• Drywall repair: Accessing ducts inside walls or floors means cutting and patching drywall — $500–$2,500 depending on extent.
• Permits and inspections: $50–$400.
• Air sealing: While ducts are open, sealing the attic floor or rim joists adds $500–$1,500 but multiplies the energy savings.
• Upgrading registers and grilles: $50–$150 each if yours are dated or undersized.

How to Save Money

Bundle duct replacement with an HVAC system replacement — contractors discount combined jobs by 10–20%, and doing them separately means paying for setup twice. Ask for a duct leakage test before and after (a blower-door-style duct test costs $300–$500); it proves the work and qualifies you for utility rebates in many states. Choose flex duct with mastic-sealed joints over the cheapest tape jobs, and keep runs short and straight — every bend adds resistance and operating cost. Claim utility duct-sealing rebates where available ($200–$1,000).

DIY vs. Contractor

DIY ductwork is feasible for accessible attics and crawlspaces if you're handy: flex duct runs cost $50–$100 in materials each, and sealing existing ducts with mastic is a solid weekend project ($100–$200 in materials). What's not DIY: design (Manual D sizing), ducts inside finished walls, and anything requiring a permit in your jurisdiction. Contractor quality varies widely — get three bids and ask each for references and proof of a leakage-test result, since "replacement" quotes can hide undersized or unsealed work.

Bottom Line

Budget $5,000–$12,000 for full ductwork replacement in 2026, but test and seal before you replace — $1,500–$4,000 in professional sealing often captures most of the savings. Always bundle duct work with equipment replacement when possible and demand a post-install leakage test.

Flex Duct vs. Sheet Metal

Flex duct costs about $0.50–$1.00 per sq ft of material and installs fast, but it must be supported every 4–6 ft and kept straight — sagging flex can cut airflow by 30% or more. Rigid sheet metal ($1.00–$1.50 per sq ft) costs more and takes longer, but it flows better, lasts decades, and cleans up well. Most quality jobs use metal trunks with flex branches; ask each contractor to specify the mix they are quoting and why, and be suspicious of all-flex quotes on long trunk runs.