Ductwork Replacement Cost Calculator
Get an instant free estimate for replacing your home's air duct system.
How is Ductwork Replacement Cost Calculated?
Total cost is driven by the Linear Footage of the system, the number of Vents/Returns, and the Accessibility of the workspace. Working in a tight crawlspace takes significantly longer than an open basement, increasing labor rates. Material choice (Flex vs. Rigid) also plays a major role in the final price.
Calculate Your Estimate
Project Location
Choose which state the project is located.
Home Details
Enter the size of your home and number of vents.
Duct Material:
Duct Location / Access:
Additional Services:
Key Factors Influencing Ductwork Rates
Material Type
Flexible Ductwork (Flex): The industry standard for residential attics. It is cost-effective and easy to route around obstacles but requires careful installation to prevent kinks.
Rigid Sheet Metal: The premium option. It offers superior airflow and durability but requires custom fabrication and takes much longer to install.
Installation Difficulty
Attics: High heat and cramped spaces make attic work difficult.
Crawlspaces: The most expensive location due to tight clearances, potential pests, and moisture, hindering crew movement.
Average Cost by Home Size
| Home Size | Flex Duct Estimate | Rigid Duct Estimate |
|---|---|---|
| 1,000 - 1,500 sq ft | $2,500 – $4,000 | $5,000 – $8,000 |
| 1,500 - 2,500 sq ft | $3,500 – $6,000 | $7,000 – $12,000 |
| 2,500 - 3,500 sq ft | $5,000 – $8,500 | $10,000 – $16,000 |
| 3,500+ sq ft | $7,000+ | $14,000+ |
Additional Service Fees
| Service | Estimated Cost | Use Case |
|---|---|---|
| Old Duct Disposal | $150 – $300 | Removing silica/fiberglass dust |
| Asbestos Abatement | $1,000 – $3,000 | Required for pre-1980s homes |
| Permit Fee | $100 – $300 | City compliance & inspection |
| Vent Boot Replacement | $40 – $80 each | Connects duct to the room register |
How to Estimate Ductwork Replacement Cost Manually
If you want to verify a quote or do a rough calculation yourself, follow these steps:
Step 1: Estimate Linear Footage
Measure the main trunk line and branch lines. If measuring is difficult, estimate 0.5 linear feet for every square foot of your home (e.g., 2,000 sq ft home ≈ 1,000 ft of duct).
Step 2: Check Your Vents
Count all supply registers and cold air returns. Each connection requires a "boot" and sealing, which costs about $250 per vent in labor and materials.
Step 3: Factor in Accessibility
Attics: +30% labor. Crawlspaces: +40% labor (due to tight clearance and difficulty moving materials).
Step 4: Apply Standard Rates
(Linear_Ft × $12) + (Vents × $250) + Disposal_Fee = Total
Example: 2,000 sq ft home with 10 vents in an attic. (1,000 ft × $4 Flex) + (10 × $250) + 30% Attic Fee = ~$8,450.
Frequently Asked Questions
How much does it cost to replace ductwork in a 2,000 sq ft house?
For a typical 2,000 sq ft home, expect to pay between $3,500 and $6,500 for flexible ductwork. Rigid metal ductwork projects can range from $7,000 to $12,000 due to higher material and labor costs.
Is it worth replacing ductwork?
Yes, if the ducts are over 15 years old, leaky, or damaged. New, sealed ductwork can improve HVAC efficiency by up to 20%, lower utility bills, and significantly reduce dust and allergens in the home.
Should I choose flexible or rigid metal ducts?
Flexible ducts are cheaper and easier to install, making them popular for residential attics. Rigid metal ducts are smoother (better airflow), easier to clean, and last longer (50+ years), but cost 2-3x more.
How do I know if my ducts need replacing?
Signs include inconsistent room temperatures, high energy bills, visible kinks or crushed sections, rust (on metal ducts), or persistent moldy smells. If ducts are over 20 years old, they likely have significant leaks.
Does homeowners insurance cover duct replacement?
Typically, no. Duct replacement is considered maintenance. However, if the damage was caused by a covered peril (like a fire or a tree falling on the house), insurance may cover the cost.
How long does the replacement take?
A full whole-home replacement usually takes 1 to 3 days. Crews must remove old materials, hang new straps, install plenums and trunks, and seal all connections.
What is the difference between sealing and replacing?
Sealing (e.g., Aeroseal) fixes leaks in existing connection points. Replacement involves removing the entire system. Sealing is a good option if ductwork is in good condition but leaky; replacement is necessary if ducts are crushed, rusted, or insulated with old materials.
Does the cost include asbestos removal?
No. If your old ducts have asbestos tape or insulation (common in homes built before 1980), you will need a specialized abatement team. This can add $1,000 to $3,000 to the project cost.
Do I need a permit?
Yes, most municipalities require a mechanical permit for ductwork replacement to ensure the system is sized correctly (Manual J/D calculations) and meets energy codes (leakage testing).
Will new ducts be quieter?
Likely yes. Old ducts often rattle or clear 'popping' noises due to pressure imbalances. Properly sized and strapped modern ducts are designed to minimize airflow noise and vibration.