Homeowners commonly pay for metal duct or flex duct based on run length, building layout, and installation complexity. This article explains the price implications, with clear low, average, and high ranges for each option and the main cost drivers behind them.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Metal Duct Installed (per linear ft) | $8 | $15 | $25 | Includes standard galvanized sheet metal and sealing |
| Flex Duct Installed (per linear ft) | $3 | $7 | $12 | Includes flexible poly-ethylene core with outer layer |
| Labor for Duct Layout (per hour) | $60 | $85 | $120 | Higher in complex homes or tight spaces |
| Fittings and Returns (per unit) | $10 | $25 | $60 | Depends on number of branches |
| Insulation (per linear ft) | $0.50 | $1.50 | $3 | Thermal/acoustical insulation adds cost |
Assumptions: Midwest or mixed regional labor rates, standard 2×4 or 2×6 framing, normal attic or crawlspace access, no major mold or electrical work.
Typical Cost Ranges For Metal Duct And Flex Duct
Prices depend on run length, system layout, and duct type. Metal duct generally costs more upfront but can offer better durability, while flex duct provides lower initial cost and faster installation.
Metal duct installations commonly fall in the $12-$25 per linear foot range, with total project prices for a typical 20- to 40-foot run often around $240-$1,000 for smaller homes or $2,000-$6,000 for full-home runs. Flex duct installations commonly fall in the $4-$9 per linear foot range, with 20- to 40-foot runs typically $80-$360, and full-home runs ranging from $1,000-$3,000 depending on access and insulation needs.
Ducting Quote Breakdown: Materials Labor and Accessories
Understanding the major cost components helps compare quotes. A formal duct quote usually lists Materials, Labor, Accessories, and sometimes Permits. For metal, materials include galvanized panels, seams, and tape; for flex, materials cover the flexible core, jacket, and foil tape.
| Component | Metal Duct | Flex Duct | Typical Range | Notes |
|---|---|---|---|---|
| Materials | $6-$18/ft | $4-$9/ft | Per linear foot | Standard gauge metal vs. insulated flex core |
| Labor | $60-$100/hr | $50-$90/hr | Hourly | Complex runs raise hours |
| Fittings & Accessories | $10-$60 each | $8-$40 each | Per unit | Elbows, takeoffs, dampers |
| Insulation | $0.50-$3/ft | $0.50-$2/ft | Per linear foot | R-value depends on climate |
| Permits & Inspections | $0-$200 | $0-$200 | Per project | Varies by jurisdiction |
Key Variables That Drive Metal vs Flex Duct Pricing
Run length and system type are the two largest drivers. Longer runs raise per-foot costs for both options, and full-home layouts with many branches increase fittings and labor. A rectangular metal system in an unfinished attic may cost less per foot than a curved, spiral metal path through finished walls.
How House Size and Room Count Change the Quote
Projects with more rooms or higher ceiling heights add cost. In larger homes with 2,000+ square feet, total duct footage can push metal duct into the higher per-foot bands, while flex duct may remain modest per foot but multiply across more zones.
Regional Differences That Move the Price Needle
Prices vary by region and labor market. Coastal markets often see higher hourly rates than inland areas. In the Southeast or Midwest, expect mid-range pricing closer to the average bands; in the West and Northeast, prices can trend toward the high end depending on access and code requirements.
Material and System Type: When Metal Wins on Long Runs
Metal duct can be more cost-efficient over long straight runs. For large homes with long, unobstructed runs, metal reduces the risk of sagging joints and maintains airflow, potentially lowering ongoing maintenance costs though initial install is higher.
Labor Efficiency and Crew Size For a Home Project
Labor hours scale with crew size and access. A two-person crew can install flex duct faster in a simple attic, while metal duct may require more fittings and sealing steps, extending labor time in complex spaces.
Cost-Reduction Moves Without Sacrificing Airflow
Options to trim price without compromising function. Consider consolidating runs, using flex for short, branched sections, choosing standard insulation, and coordinating duct work with other trades to minimize access openings. Bundling services or scheduling in a slower season can lower quotes.
Three Real-World Quote Scenarios (Illustrative)
Concrete examples help buyers compare offers. Scenario A uses metal duct for a single-story, 1,200 sq ft home with 30 ft of total run. Scenario B uses flex duct throughout in a 1,800 sq ft two-story. Scenario C mixes metal for main runs and flex for branches in a 2,400 sq ft home.
- Scenario A: Metal duct, 30 ft total, simple attic access — Materials $180-$540, Labor $1,800-$3,000, Total $2,100-$3,540
- Scenario B: Flex duct, 45 ft total, multiple rooms — Materials $180-$405, Labor $900-$1,800, Total $1,300-$2,205
- Scenario C: Hybrid, 90 ft total, mixed access — Materials $540-$1,350, Labor $2,700-$4,500, Total $3,240-$7,125
Lifetime Costs: Durability And Maintenance Considerations
Metal duct tends to last longer with fewer punctures and leaks. Flex duct is cheaper upfront but may require more frequent inspection and potential re-sealing, especially in humid climates or long runs where the flexible core can sag or separate. Budget for a mid-life check and possible resealing in regions with temperature swings.
