New air ducts cost about $2,000-$8,000 for many U.S. homes, with a typical project near $4,500. Home size, number of duct runs, material, access, and whether old ducts must be removed drive the final estimate.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| New duct system | $2,000 | $4,500 | $8,000 | Typical residential installation |
| Per home square foot | $2 | $4 | $7 | Broad planning range; layout and access matter |
| Per duct run | $150 | $350 | $700 | Supply or return run, including installation |
| Large or difficult project | $7,000 | $10,000 | $15,000+ | Extensive remodeling, multiple floors, or difficult access |
Assumptions: U.S. contractor pricing, standard residential materials, ordinary access, and no major HVAC equipment replacement.
What a New Residential Duct System Usually Costs
A straightforward installation in a 1,200- to 1,800-square-foot, single-story home commonly falls between $2,500 and $6,000. A larger two-story house, a layout with many rooms, or a project requiring ducts inside finished walls can reach $6,000-$12,000 or more. The average estimate of about $4,500 assumes a conventional forced-air system and moderate labor.
Some contractors quote by home area, while others price each run, trunk line, or labor task. A rough planning rate is $2-$7 per square foot of conditioned area, but it is not a substitute for a duct layout and load calculation. Compare estimates only when they cover the same number of runs, materials, insulation, and removal work.
How Sheet Metal, Flex Duct, and Labor Shape the Quote
Material choice changes both the purchase price and the labor needed to install and support the system. Sheet metal is durable but may require more fabrication; insulated flexible duct can cost less in accessible attic or crawlspace runs. The table shows typical project allowances, not fixed national rates.
| Quote component | Low | Average | High |
|---|---|---|---|
| Duct material and fittings | $500 | $1,500 | $3,000 |
| Installation labor | $1,000 | $2,400 | $5,000 |
| Equipment and sealing supplies | $150 | $450 | $900 |
| Permits or inspection | $0 | $150 | $500 |
| Old duct removal and disposal | $250 | $700 | $1,500 |
Typical labor charges work out to roughly $75-$150 per hour, though bids usually price the whole job. Ask whether the quote includes duct sealing, insulation, balancing, and cleanup; these may be separate charges.
Material, labor, and access costs overlap, so line-item quotes make comparisons more meaningful.
Why Home Size, Duct Runs, and Access Change the Price
A 1,000-square-foot home with 6-8 supply runs generally needs less material and labor than a 2,500-square-foot home with 14-20 runs. Larger homes may also need multiple trunk lines or zoning changes. A contractor should size ducts for the HVAC equipment and room airflow, rather than simply copying an undersized existing layout.
Access is a major price driver. Open framing during construction can reduce labor compared with routing ducts through finished ceilings or narrow crawlspaces. Adding a second floor, extending a trunk line more than 20-30 feet, or relocating returns can add hundreds to several thousand dollars. Request a revised scope when the number of runs or the route changes.
Material specifications matter, too. Insulated flexible duct is often used for shorter branch runs; rigid sheet-metal trunks may suit longer central routes. Local codes may require specific insulation levels, supports, sealing, or fire stopping, particularly in unconditioned spaces.
How Long Duct Installation Takes and What Labor Covers
A crew of two or three HVAC workers may finish an accessible, straightforward home in 1-3 days. A multi-story retrofit with demolition, difficult routing, and drywall coordination may take 4-7 working days, excluding repairs by other trades. Labor is often higher when the house must remain occupied or installation is broken into several visits.
Labor generally covers measuring, cutting or fabricating duct, hanging and supporting runs, connecting to the air handler and registers, sealing joints, and testing airflow. Ask whether drywall patching, painting, electrical work, and HVAC balancing are included. Clarifying trade boundaries helps prevent surprise charges after the duct crew leaves.
When Old Duct Removal Adds to the Installation Bill
Removing old ducts can add about $250-$1,500, depending on quantity, location, and disposal requirements. Accessible attic ducts are usually less costly to remove than ducts concealed in walls or ceilings. Contaminated material, cramped crawlspaces, or repairs needed after demolition can raise the bill further.
Other possible add-ons include new registers at $15-$80 each, return grilles at $30-$150, and duct sealing or balancing at roughly $200-$800 for a typical home. These services are not automatically necessary in every installation. Have the contractor identify which add-ons are required for airflow, code compliance, or the agreed scope.
How U.S. Location and Home Layout Affect Duct Prices
Labor and permit rates vary by market. As a broad comparison, dense, high-cost metropolitan areas may run 15%-30% above national midrange estimates, while some rural markets may be 5%-15% lower. These differences are not guaranteed; limited contractor availability or long travel distances can make rural work more expensive.
Climate also affects specifications. Homes with ducts in hot attics, cold crawlspaces, or other unconditioned areas may need more insulation and careful air sealing. Local code and inspection rules differ, so verify permit responsibility with the contractor and building department. Compare local bids against the same written duct plan, not an online national average alone.
Which Scope Choices Can Reduce New Duct Costs
Keep the project focused on the ductwork that needs replacement or addition. If existing ducts are sound, correctly sized, and accessible, a contractor may be able to retain some sections rather than replace the entire network. A professional inspection can identify leakage, damaged insulation, poor routing, or undersized runs before a full replacement is priced.
Get at least three written estimates with quantities, material types, insulation, labor, permits, disposal, and testing listed. Scheduling during a contractor’s less-busy period may improve availability, though discounts are not assured. If remodeling is planned, installing ducts while framing is open can avoid later cutting and patching.
A lower bid may omit balancing, sealing, or removal, so compare the complete scope and warranty. Avoid paying for extra zones, premium materials, or new registers unless the design or comfort problem justifies them. The most reliable savings come from controlling the layout and comparing complete, equivalent quotes.