Ductwork Replacement Cost Calculator
Get an instant free estimate for replacing your home's ductwork based on home size, vents, material, and accessibility.
Free Ductwork Replacement Cost Calculator
Use this calculator to calculate the cost of ductwork replacement near you for free. Enter your ZIP code for a localized estimate.
Home Details
Enter the size of your home and number of vents.
Duct Material:
Duct Location / Access:
Additional Services:
Estimates are instant and require no contact information.
Based on inputs, your Ductwork Replacement project cost is approximately:
Note that the cost above is purely an estimate.
The actual cost may be higher or lower depending on the contractor's quote.
How Much Does Ductwork Replacement Cost?
Replacing the ductwork in a whole home typically runs $5,000 to $12,000, with most homeowners around $6,000 to $10,000. Your home size and number of vents set the base, the duct material swings it widely (flexible is cheapest; rigid sheet metal can be two to three times more), and accessibility — basement vs. attic vs. crawlspace — drives a big share of the labor.
From there, the upgrades decide the rest: sealing and R-8 insulation to stop the 20-30% of air leaky ducts waste, plus old-duct removal, new registers, sanitizing, and permits. One important note — if your ducts are sound but leaky, sealing instead of replacingcan be far cheaper, so it's worth knowing which you actually need. Use the calculator above to localize your estimate, then read on for exactly what drives your quote.
Ductwork Replacement Cost by Material & Access
Typical Whole-Home Replacement by Material
| Duct Material | Relative Cost | Best For |
|---|---|---|
| Flexible (insulated flex) | $ — lowest | Branch runs, budget, most homes |
| Fiberboard | $$ — middle | Built-in insulation, quieter runs |
| Rigid sheet metal | $$$ — highest | Trunk lines, durability, best airflow |
Source: Aggregated HVAC contractor quote data across U.S. markets; labor anchored to U.S. Bureau of Labor Statistics data for Heating, A/C & Refrigeration Mechanics (SOC 49-9021). Final cost depends on home size, vent count, and access.
How Access & Add-Ons Change the Price
| Factor | Cost Impact | Notes |
|---|---|---|
| Basement access | Baseline | Open, upright work — easiest. |
| Attic access | +30% | Heat and tight, careful movement. |
| Crawlspace access | +40% | Confined, on-your-back labor. |
| Duct sealing / R-8 insulation | +~$1.50/sq ft each | Cuts the 20-30% of air leaky ducts waste. |
| Per vent / return | +~$250 each | Each connection cut in and balanced. |
| Old-duct removal / permit | ~$200 / ~$150 | Haul-away and required inspection. |
Source: Aggregated quote ranges from licensed HVAC contractors, with regional pricing applied via the calculator above.
The 6 Factors That Drive Your Quote
1. Home Size & Duct Layout
Bigger homes need more duct runs, so square footage is the foundation of the estimate. A 1,500 sq ft single-system home is a far smaller job than a 3,000 sq ft two-story with long trunk lines and multiple branches. The total linear footage of supply and return duct — not just the floor area — is what a contractor actually prices, which is why a sprawling ranch can cost as much as a compact two-story.
2. Number of Vents & Returns
Every supply register and return grille is a separate connection point that has to be cut in, ducted, and balanced. Homes with more rooms — and the returns needed for proper airflow — cost more because each run adds material and labor (commonly around $250 per connection). Adding returns that a home was missing improves comfort and system efficiency, but it also raises the count the job is priced on.
3. Duct Material
Material is a major price lever. Insulated flexible duct is the economical, common choice for branch runs and is the cheapest to install. Rigid sheet-metal duct is the premium option — durable, smooth-walled for better airflow, and longest-lasting, but more labor-intensive to fabricate and seal. Fiberboard sits in between. A full rigid-metal replacement can cost two to three times a flexible one for the same home.
4. Accessibility
Where your ducts run decides how hard the crew has to work. A basement or open mechanical room is the easiest and the baseline price. A hot, cramped attic adds roughly 30% for the heat and tight movement, and a low crawlspace is the toughest — often 40% more — because techs work on their backs in confined, dirty conditions. Two identical homes can be quoted very differently based on access alone.
5. Sealing & Insulation
New duct is the chance to fix the leaks that waste 20-30% of conditioned air in typical systems. Professional sealing — mastic at the joints or an aerosol process like Aeroseal from the inside — and upgrading to R-8 insulation cost extra per square foot but cut energy bills and improve comfort. On attic and crawlspace runs especially, proper insulation isn't optional if you want the system to perform.
6. Removal, Registers & Permits
A few finishing costs round out the quote. Tearing out and hauling away the old ductwork is a flat add-on, as is a building permit where one is required (most full duct replacements need an inspection). New registers and grilles refresh the look and replace warped or painted-shut ones, and antimicrobial sanitizing is offered where mold or odors are a concern. Individually small, together they shape the final number.
Replace, Reseal, or Repair?
Full replacement is the most expensive option — and not always the one you need. Match the fix to the ducts' actual condition.
Replace the ductwork when…
- Ducts are crushed, disconnected, badly corroded, or moldy, or contain materials you want gone.
- They're undersized or mismatched for a new, higher-capacity HVAC system.
- They're past ~25 years and already causing comfort and efficiency problems.
Seal or repair instead when…
- The ducts are structurally sound but leaky — sealing (mastic or Aeroseal) recovers most of the lost air for far less.
- Only a section is damaged or a few runs sag — targeted repair beats a whole-home tear-out.
- You mainly want better efficiency, which added insulation and sealing often deliver on their own.
Get an inspection before committing: a good contractor will tell you honestly whether sealing will do the job or replacement is truly warranted — and the calculator above lets you price the replacement either way.
How to Vet and Hire an HVAC Contractor
Ductwork is part of your HVAC system, so the install quality affects comfort and energy bills for decades — vet on competence, not just price:
- Confirm an HVAC license & insurance (liability and workers' comp) and verify the license with your state board.
- Ask about duct sizing — a proper job uses a Manual D / load calculation, not just matching the old layout.
- Insist on sealing at every joint (mastic or Aeroseal) so the new ducts don't leak from day one.
- Check reviews and ask for references on recent duct replacements, and confirm they pull the permit.
What a complete quote should spell out
- The duct material (flex/rigid/fiberboard) and whether trunk lines are metal.
- The number of supply and return runs, duct sizing method, and insulation R-value.
- Sealing method, old-duct removal, and new registers/grilles.
- Permit and inspection, cleanup, system testing/balancing, and the warranty.
Methodology & Sources
This calculator estimates from your home size (a per-square-foot rate set by duct material), plus a per-connection cost for each vent and return, then applies an accessibility multiplier(basement, attic, or crawlspace). Selected upgrades — sealing, R-8 insulation, old-duct removal, sanitizing, new registers, and permit — are added, and the result is adjusted to your ZIP code's regional price level. In short: ((Sq Ft × Material Rate) + Vents) × Access + Add-ons, × Regional Factor.
Data sources:
- Air Conditioning Contractors of America (ACCA) — Manual D duct design
- ENERGY STAR — duct sealing & efficiency
- U.S. Bureau of Labor Statistics — HVAC Mechanics & Installers (SOC 49-9021)
For a full explanation of how every calculator on this site is built and localized, see our methodology page.
About the Reviewer
Licensed Mechanical (HVAC) Contractor
Mechanical contractor specializing in residential HVAC system sizing, replacement, and indoor air quality.
View full profile & credentials →Frequently Asked Questions
Replacing the ductwork in a whole home typically runs $5,000-$12,000, with most homeowners landing around $6,000-$10,000. The figure is driven by your home's size and number of vents, the duct material (flexible is cheapest, rigid sheet metal the priciest), and how accessible the ducts are — attic and crawlspace work costs more than a basement. Sealing, insulation, old-duct removal, and permits add to the total. Partial replacement or repair costs much less.
For a 2,000 sq ft home with about 10 vents, expect roughly $6,000-$11,000 for a full flexible-duct replacement, depending heavily on access. Basement ducts are at the lower end; a difficult crawlspace or hot attic pushes toward the top, and rigid sheet-metal duct can run significantly higher. Adding duct sealing, R-8 insulation, and new registers raises it further. Use the calculator above with your exact square footage, vent count, material, and access for a localized estimate.
Not always, but it's the ideal time to consider it. If your ducts are old, leaky, undersized, or were sized for a different system, pairing a new high-efficiency furnace or AC with bad ductwork wastes much of the upgrade. Many contractors check duct sizing (a Manual D calculation) when installing new equipment. If the ducts are in good shape and properly sized, you can keep them; if they're failing or mismatched, replacing them together avoids paying twice for access.
Flexible duct (insulated flex) is cheaper, faster to install, and fine for most branch runs, but it can sag or kink if poorly installed, restricting airflow. Rigid sheet-metal duct costs more — often two to three times as much for a full home — but has smooth walls for better airflow, lasts the longest, and resists pests and damage. Many quality installs use a hybrid: rigid metal for main trunk lines and flex for the final runs to registers. Choose based on budget and how long you'll stay.
Because the labor is harder and slower. In a basement or open mechanical room, techs stand upright with room to work, so it's the baseline price. An attic is hot, cramped, and requires moving carefully across joists — adding around 30%. A crawlspace is the toughest: workers lie on their backs in a low, dirty, sometimes damp space, which adds roughly 40% or more. The duct material may cost the same, but access drives a big share of the labor.
It depends on their condition. If the ducts are structurally sound but leaky, professional sealing (mastic or an Aeroseal-type process) plus added insulation is far cheaper than replacement and can recover much of the lost efficiency. Replace when ducts are crushed, disconnected, badly corroded, moldy, undersized for the system, or contain old materials you want gone. A good contractor will inspect and tell you honestly whether sealing will do or full replacement is warranted.
Common red flags: rooms that never heat or cool evenly, weak airflow from some vents, rising energy bills, excessive dust, musty or moldy odors, visible duct damage or disconnected sections, and pest droppings inside the ducts. Age matters too — ductwork generally lasts 20-30 years, and older flex or fiberboard can deteriorate. If you have multiple signs, get an inspection; sometimes sealing fixes it, and sometimes the ducts are past their service life.
Quality ductwork typically lasts 20-30 years, though sheet metal can last longer and poorly installed or damaged flex duct fails sooner. Over time, joints loosen and leak, insulation degrades, and flex duct can sag, tear, or get crushed. If your ducts are approaching or past 25 years — especially if you're already seeing comfort or efficiency problems, or replacing your HVAC system — it's a sensible time to evaluate whether to reseal or replace.
Usually yes, especially for ducts running through unconditioned attics or crawlspaces. Uninsulated or poorly insulated ducts lose heating and cooling to those spaces, making your system work harder. Upgrading to R-8 insulation is a modest per-square-foot add-on that reduces energy loss and improves comfort, and it pays back over time in lower bills. If you're already replacing ducts in an attic or crawlspace, doing the insulation at the same time is the efficient choice.
Often, yes. Most jurisdictions require a permit (and an inspection) for a full ductwork replacement, since it's part of the HVAC system and affects safety and efficiency. A licensed HVAC contractor will typically handle the permit and schedule the inspection as part of the job — it's usually a small flat fee. Skipping required permits can cause problems at resale and may void equipment warranties, so confirm permitting is included in your quote.