How Much Does Ductwork Replacement Cost?
$1,500 to $10,000 is the typical range for ductwork replacement, with the national average around $6,500 for a complete whole-house replacement. Partial ductwork replacement costs $1,500 to $5,000, while a full replacement with a redesigned layout runs $8,000 to $15,000 or more.
Homeowners researching how much ductwork replacement costs should know that most homes lose 25 to 40% of conditioned air through duct leaks, according to the U.S. Department of Energy. Replacing old ductwork with properly sealed new ducts can reduce heating and cooling costs by 20 to 30%, often paying for itself within 5 to 8 years. If you are also upgrading your HVAC system, a heat pump ($4,000 to $12,000 installed) pairs well with new ductwork for maximum efficiency gains. Labor accounts for roughly 50 to 70% of total cost, with HVAC technicians charging $50 to $100 per hour. Ductwork problems are commonly flagged during a home inspection ($300 to $500), so if you are buying a home and the inspector notes leaky or deteriorated ducts, factor replacement into your budget.
Ductwork Replacement Cost by Home Size
Homes under 1,500 square feet pay $3,000 to $7,000 for a full ductwork replacement, while homes over 3,500 square feet can expect to pay $10,000 to $18,000 or more.
| Home Size | Cost Range | Avg. Linear Feet of Duct |
|---|---|---|
| Small home (under 1,500 sq ft) | $3,000 - $7,000 | 100 - 200 ft |
| Medium home (1,500 - 2,500 sq ft) | $5,000 - $10,000 | 200 - 350 ft |
| Large home (2,500 - 3,500 sq ft) | $7,000 - $13,000 | 300 - 500 ft |
| Very large home (3,500+ sq ft) | $10,000 - $18,000+ | 450 - 700+ ft |
These ranges assume average labor costs. Homes in high cost-of-living metros should budget 20 to 35% above these figures.
Ductwork Cost by Material
Sheet metal ductwork costs $3 to $8 per linear foot for materials, making it the most expensive option but also the longest lasting. Flex duct is the budget-friendly choice at $1 to $3 per linear foot.
| Duct Material | Cost per Linear Foot | Lifespan | Best For |
|---|---|---|---|
| Flexible duct (flex duct) | $1 - $3 | 15 - 25 years | Attic runs, budget projects, short branch lines |
| Sheet metal (galvanized steel) | $3 - $8 | 30+ years | Main trunk lines, long runs, high-airflow systems |
| Fiberboard | $2 - $4 | 15 - 20 years | Dry climates where built-in insulation is valued |
The cost of ductwork replacement depends heavily on material choice. Most contractors recommend a hybrid approach: sheet metal for the main trunk lines and flex duct for the branch runs to individual rooms. This lands the total material bill between $1,500 and $4,000 for an average home.
Factors That Affect Ductwork Replacement Cost
$1,500 to $10,000 is the typical range, and several key factors determine where your project falls within it.
Home Size and Layout
A two-story home costs $1,500 to $3,000 more than a single-story home of the same square footage because vertical runs require additional fittings and harder installation. Complex layouts with multiple zones cost more due to longer runs and more connections.
Accessibility
Ductwork in easy-to-reach locations costs 25 to 40% less than ducts inside walls or between floors. Crawl space installations add $500 to $1,500 due to tight clearances, and cutting into drywall adds $300 to $1,000 in patching costs.
Duct Insulation
Insulating new ductwork adds $1 to $3 per linear foot, or $800 to $2,500 for a whole house. Insulation is required by code for ducts in unconditioned spaces like attics and crawl spaces. Skipping it can waste 10 to 25% of your heating and cooling energy.
Zoning Systems
Adding HVAC zoning costs $2,000 to $5,000 on top of the base price. Zoning uses motorized dampers and separate thermostats to direct air to specific areas, saving 15 to 30% on energy in multi-story homes.
Design vs. Like-for-Like Replacement
A duct system redesign adds $1,500 to $4,000 compared to a like-for-like swap. How much it costs to replace ductwork goes up with a redesign, but a redesign is worthwhile if the original ductwork was poorly sized, if you have added a home addition, or if you are switching to a heat pump that requires different duct sizing.
Removal and Permits
Removing old ductwork costs $500 to $2,000, and most contractors include removal in their quotes. Permit fees range from $100 to $500. Older homes may have asbestos-wrapped duct insulation requiring licensed abatement at $1,500 to $3,000.
Signs You Need New Ductwork
$1,500 to $10,000 for ductwork replacement is the typical range, and catching problems early can prevent more costly HVAC damage. Watch for these warning signs.
- Ductwork is 20 or more years old
- Uneven heating or cooling between rooms
- Energy bills have been rising despite regular HVAC maintenance
- Excessive dust in living spaces, even with clean filters
- Visible damage such as crushed, disconnected, or hanging ducts
- Musty or moldy smell when the HVAC system runs (consider a mold remediation assessment if you notice persistent odors)
- Rattling, popping, or whistling sounds from the duct system
- Rooms that are always too hot or too cold regardless of thermostat settings
Ductwork Replacement vs. Duct Sealing
Professional duct sealing costs $1,000 to $2,500 and works well when ducts are structurally sound but leaky at joints. Aeroseal treatment ($1,500 to $3,000) coats the inside of the duct system and can reduce leakage by up to 90%. Sealing is not a substitute for replacement when ducts are crushed, corroded, or contaminated with mold.
How to Save Money on Ductwork Replacement
$250 to $2,500 in potential savings is achievable with the right approach. These tips can help reduce your total cost.
- Get at least three written quotes. Ductwork pricing varies significantly between contractors. Ask each to itemize labor, materials, insulation, and removal costs separately so you can compare accurately.
- Bundle with HVAC replacement. If you are also replacing your furnace or heat pump, many contractors offer a 10 to 15% discount on ductwork done at the same time.
- Use flex duct where appropriate. Flex duct in accessible attic runs costs 50 to 70% less than sheet metal and performs well when installed without kinks. Reserve sheet metal for trunk lines.
- Schedule in spring or fall. HVAC contractors are busiest in summer and winter. Off-season scheduling often means shorter wait times and better pricing.
- Get an energy audit first. Some utilities offer free or subsidized audits that include duct testing. This may allow a targeted partial replacement ($2,000 to $5,000) instead of a full overhaul.
- Check for rebates. Some utilities and state programs offer rebates of $200 to $1,000 for ductwork improvements as part of energy efficiency incentives.
Sealing duct leaks yourself? HVAC foil tape and mastic sealant can fix minor leaks and improve efficiency before a full replacement.
Shop on AmazonFrequently Asked Questions
How much does it cost to replace ductwork?
Replacing ductwork costs $1,500 to $5,000 for a partial replacement and $5,000 to $10,000 for a complete whole-house replacement. The national average is around $6,500. Costs depend on home size, duct material, accessibility, and layout complexity. Homes with hard-to-reach ductwork inside walls can push costs toward the higher end.
How long does ductwork last?
HVAC ductwork typically lasts 20 to 25 years. Sheet metal ducts can last 30 years or longer with proper maintenance, while flex duct deteriorates faster in hot attics. After 20 years, joints begin to separate, insulation degrades, and air leaks become significant enough to affect energy bills and comfort.
Is it worth it to replace ductwork?
Replacing old, leaky ductwork can reduce energy bills by 20 to 30% because the average home loses 25 to 40% of conditioned air through duct leaks. New ductwork also improves indoor air quality by eliminating accumulated dust, mold spores, and debris. The investment typically pays for itself in 5 to 8 years through energy savings.
What is the cheapest ductwork material?
Flexible duct is the cheapest at $1 to $3 per linear foot. It works well for short branch runs in accessible areas like attics. Sheet metal costs $3 to $8 per linear foot but lasts longer and handles higher airflow. Most contractors recommend flex duct for branches and sheet metal for the main trunk lines.
How long does ductwork replacement take?
A full replacement takes 2 to 4 days for a two-person HVAC crew in an average-sized home. Partial replacements can often be completed in a single day. Homes with ducts between finished floors or inside closed walls may take up to a week due to the additional drywall work required.