Open-framing new construction
Routing is accessible, but design quality still depends on equipment location, room loads, return paths, register placement, and coordination before walls close.
New supply-and-return system
Ductwork Installation Cost Calculator (2026)
Plan the cost to install ducts in a home or addition that does not have a usable distribution system. The estimate separates routing, returns, insulation, testing, and finish repair instead of relying on a price-per-foot shortcut.
Direct answer
New HVAC ductwork often costs about $5,000-$15,000 for a typical home. A small addition may cost $2,000-$5,000, while multi-level routing through finished rooms can exceed $25,000. This page covers new duct design and installation. If ducts already exist and are being removed, use the ductwork replacement calculator.
New Ductwork Cost by Project Type
| Project | Planning range | Scope boundary |
|---|---|---|
| Small addition or limited new branch system | $2,000-$5,000 | New runs and registers serving a defined area; confirm how they connect to existing equipment and returns. |
| New ducts for a typical 1,500-2,500 sq ft home | $5,000-$15,000 | Room-by-room supply and return design, trunks, branches, insulation, sealing, registers, balancing, and access. |
| Complex retrofit through finished spaces | $10,000-$25,000+ | Multi-level routing, chases, soffits, structural coordination, and finish repair can dominate the price. |
Design evidence, not template text
Five Decisions a Complete Bid Must Show
| Decision | Evidence to request | Why it changes value |
|---|---|---|
| Supply layout | Room-by-room airflow targets and register locations | A cheap trunk-and-branch layout can leave distant rooms uncomfortable. |
| Return-air path | Return locations, grille sizes, door-under-cut or transfer strategy | Too little return capacity can create noise and high static pressure. |
| Duct size | Measured load and friction-rate assumptions | Price-per-foot estimates do not prove the ducts can move required airflow. |
| Thermal and air barrier | Insulation value, vapor barrier, joint-sealing method | Uninsulated or poorly sealed ducts waste capacity in attics and crawl spaces. |
| Commissioning | Static pressure, room airflow, leakage or balancing report | A system can be complete on paper but perform poorly after startup. |
Projects That Should Not Share One Price
Older home with no usable ducts
The comparison is not only duct price. Include chases, wall or ceiling openings, finish repair, equipment sizing, electrical work, permits, and the disruption of routing between floors.
Addition tied to an existing system
Verify that the current blower and ducts have capacity for the new rooms. A few branches may look inexpensive while creating pressure or comfort problems elsewhere.
New Installation Quote Checklist
- Room-by-room airflow targets and equipment assumptions
- Supply trunks, branches, returns, registers, grilles, dampers, and filter location
- Duct material, sizes, insulation rating, vapor barrier, supports, and joint-sealing method
- Permit responsibility, access work, cleanup, and drywall or finish repair
- Static-pressure, airflow, balancing, and leakage verification after startup
Compare Alternatives on Equal Scope
If the project also needs equipment, do not mix the duct number with the equipment number. Review the HVAC installation cost guide. For homes where routing would be invasive, compare the same rooms in the mini-split zone planner. A lower total is not comparable if it omits returns, finish repair, electrical work, or commissioning.
Request Local Ductwork Quotes
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FAQ
How much does it cost to install HVAC ductwork?
A complete new duct system often costs about $5,000-$15,000 for a typical home, while small additions can cost less and complex finished-space retrofits can exceed $25,000. Layout, return-air needs, access, insulation, sealing, permits, testing, and finish repair drive the range.
Is new duct installation the same as duct replacement?
No. New installation creates a distribution system where usable ducts do not exist. Replacement removes or abandons old ducts and installs new ones, adding demolition, disposal, connection, and existing-condition risk.
Can ductwork cost be estimated per square foot?
Square footage can create a rough planning range, but it is not a bid method. Two equal-size homes may need different run lengths, returns, chases, insulation, and finish repair. Compare a room-by-room scope instead.
Should I install ducts or choose mini splits?
Compare both when a home lacks usable ducts. Ducts can provide centralized filtration and familiar distribution; mini splits can avoid invasive routing. Compare the same rooms, heating design, electrical work, controls, maintenance, and finish impact.
What should a new ductwork quote include?
Require design assumptions, material type, sizes, supplies, returns, insulation, sealing, registers, dampers, supports, permits, testing, balancing, cleanup, finish repair responsibility, and written exclusions.
Methodology
Ranges model a complete new supply-and-return system by conditioned area, routing access, layout complexity, returns, and finish repair. They are planning estimates, not contractor bids. Compare at least three proposals using the same drawings and testing requirements. Last updated September 20, 2026.