🎯Quick Cost Summary
Flex duct material: $0.50-3.50/ft (non-insulated to R8). Rigid metal: $3-8/ft. Whole-house replacement: $2,000-6,000 installed. Single room addition: $300-1,500. Factory-direct from USFlexDuct saves 20-40% vs retail. Get a quote →
Duct Material Costs Per Foot
Material cost is the controllable variable in any duct project. The same duct run that costs $150 in flex duct material might cost $500 in rigid metal — and both deliver air to the room. Understanding the per-foot pricing for each duct type helps you make informed decisions about where to use which material.
| Duct Type | 4" | 6" | 8" | 10" | 12" |
|---|---|---|---|---|---|
| Non-insulated flex | $0.40 | $0.60 | $0.90 | $1.20 | $1.50 |
| R6 insulated flex | $1.20 | $1.50 | $2.00 | $2.50 | $3.00 |
| R8 insulated flex | $1.50 | $2.00 | $2.50 | $3.00 | $3.50 |
| Rigid galvanized (26ga) | $2.50 | $3.50 | $5.00 | $6.50 | $8.00 |
| Spiral duct | $2.00 | $3.00 | $4.50 | $6.00 | $7.50 |
| Semi-rigid aluminum | $1.50 | $2.50 | — | — | — |
| Duct board | — | $4.00 | $5.00 | $6.50 | $8.00 |
Note: These are material-only costs at typical US contractor pricing (2026). Factory-direct pricing from USFlexDuct is typically 20-40% below these figures for bulk orders. Prices vary by region, supplier, and order quantity. Fittings (elbows, tees, reducers, boots) add $5-25 per fitting.
Air Duct Replacement Cost (Whole House)
Replacing all ductwork in an existing home is one of the larger HVAC projects a homeowner can undertake. The total cost depends on house size, duct location, duct type, and local labor rates.
| Home Size | Flex Duct (Installed) | Rigid Metal (Installed) | Hybrid (Typical) |
|---|---|---|---|
| 1,000-1,500 sq ft | $1,500-2,500 | $3,500-5,000 | $2,000-3,500 |
| 1,500-2,500 sq ft | $2,000-4,000 | $4,500-7,000 | $3,000-5,000 |
| 2,500-3,500 sq ft | $3,500-5,500 | $6,000-10,000 | $4,500-7,000 |
| 3,500+ sq ft | $5,000-8,000 | $8,000-15,000 | $6,000-10,000 |
"Hybrid" is the most common and cost-effective approach: rigid metal for the main trunk line (for durability and low friction on the longest run) with flex duct for all branch connections to individual registers. This combination captures the performance advantage of rigid duct where it matters most while using the cost and installation speed advantage of flex duct everywhere else.
New Duct Installation Cost (New Construction)
Installing ductwork in new construction is significantly cheaper per foot than replacement because the framing is open, there is no demolition, and the installer has unrestricted access.
Typical new construction duct installation costs $2,000-6,000 for a 2,000 sq ft home, including trunk lines, branch runs, boots, registers, and connections to the air handler. This is usually included in the HVAC contractor's bid for the complete system (equipment + ductwork + installation), which runs $8,000-15,000 for a standard residential system.
The ductwork portion typically represents 25-40% of the total HVAC installation cost. Choosing flex duct for branch runs (the standard in most US markets) reduces the ductwork cost by 30-40% compared to an all-rigid-metal system, without compromising performance when properly installed per our installation guide.
Adding Ductwork to a Single Room
Adding a duct run to a room that is not currently served by the HVAC system — a converted garage, finished attic, basement bedroom, or home addition — is one of the most common duct projects.
| Scenario | Typical Cost | Complexity |
|---|---|---|
| Short run from accessible trunk (attic/basement) | $300-600 | Low |
| Medium run through open attic or crawl space | $500-900 | Medium |
| Run through finished walls or between floors | $800-1,500 | High |
| Long run requiring new trunk extension | $1,200-2,500 | High |
| Home addition requiring duct system extension | $1,500-4,000 | Very high |
For single-room additions, flex duct is almost always the right choice: it routes around obstacles without fittings, installs faster, and costs less. A typical 15-foot flex duct branch from trunk to register takes a skilled installer 30-60 minutes to complete, compared to 2-4 hours for a rigid metal run of the same length.
Duct Insulation Cost
Adding insulation to existing bare ductwork — or upgrading from a lower R-value to a higher one — is one of the best energy investments in any home. See our attic duct insulation guide and crawl space duct insulation guide for detailed coverage.
| Insulation Type | Material Cost / sq ft | Installed Cost / sq ft | Whole-House (Typical) |
|---|---|---|---|
| R6 fiberglass wrap | $0.60-1.00 | $1.50-2.50 | $800-1,500 |
| R8 fiberglass wrap | $0.80-1.30 | $2.00-3.50 | $1,000-2,000 |
| Closed-cell spray foam | $1.50-3.00 | $3.00-5.00 | $2,500-5,000 |
| R8 insulated flex duct (replace) | $2.00-3.50/LF | $4.00-7.00/LF | $1,500-3,000 |
The payback period for duct insulation is typically 2-5 years in climate zones 1-4 (the southern and central US), making it one of the fastest-returning energy investments available. For a detailed R-value comparison, see our R6 vs R8 duct insulation guide.
Cost Factors: What Makes Your Project Cheaper or More Expensive
Accessibility is the single biggest factor. Ductwork in an open attic or unfinished basement is cheap to install or replace because the installer can see, reach, and work on the ducts without demolition. Ductwork inside finished walls, between floors, or under a concrete slab requires opening up the building structure — drywall removal, patching, painting — which can double or triple the labor cost.
Duct type matters significantly for material cost but also for labor. Flex duct installs 2-3x faster than rigid metal because it does not require fittings at direction changes, is lighter to handle, and cuts with a utility knife instead of tin snips. The labor savings from flex duct often exceed the material savings.
Local labor rates vary by 50-100% across the US. HVAC labor in Houston, TX averages $55-85/hour; in New York City, it is $90-140/hour; in rural areas, it is $40-60/hour. The same project that costs $3,000 in Houston might cost $5,000 in Manhattan.
System complexity — number of zones, branch runs, and registers — directly determines the amount of ductwork and connections needed. A simple single-zone system with 8 registers requires roughly 150-200 linear feet of duct. A multi-zone system with 15+ registers in a 3,000 sq ft home might need 400-500 linear feet.
DIY vs Professional Installation
Flex duct installation is one of the more DIY-friendly HVAC tasks. The materials are lightweight, no welding or specialized tools are required, and the connections are straightforward (clamp + seal). A competent DIYer can install a branch run from trunk to register in 1-2 hours following our step-by-step installation guide.
DIY savings: Labor is 50-70% of the total installed cost. A project that costs $3,000 professionally installed might cost $800-1,200 in materials alone. The savings are real and significant.
When to hire a professional: System design (sizing the trunk line, calculating CFM per room, balancing the system), connection to the air handler or furnace, and any work involving gas lines or electrical connections. Duct replacement in tight crawl spaces or high attics also benefits from professional experience. Many jurisdictions require permits and inspections for ductwork modifications — check local requirements.
How to Save Money on Ductwork
Buy factory-direct. Purchasing duct material from a manufacturer like USFlexDuct rather than through a distributor or retailer saves 20-40% on material costs. For a $3,000 project, that is $600-1,200 in savings. We ship directly from our Brookshire, TX warehouse to contractors and homeowners nationwide.
Use flex duct for branch runs. The hybrid approach — rigid trunk with flex branches — delivers the best balance of performance and cost. Only use rigid metal where it genuinely matters: main trunk lines over 30 feet and kitchen exhaust (code requirement).
Seal before you insulate. Duct sealing costs $50-200 in materials (mastic sealant + foil tape) and reduces energy loss by 10-20%. This is the highest-ROI improvement you can make to an existing duct system.
Match insulation to location. R8 in the attic, R6 in the crawl space, and no insulation in conditioned spaces. Over-insulating ducts in conditioned basements wastes money; under-insulating attic ducts wastes energy. See our duct insulation guide for climate-zone-specific recommendations.
Do the easy parts yourself. Even if you hire a contractor for the system design and trunk installation, you can install the flex duct branch runs, apply insulation, and seal joints yourself. This hybrid DIY/pro approach captures most of the labor savings while ensuring the critical design work is done correctly.