Spiral duct cost per foot typically ranges from $4-$12 per ft for plain galvanized runs, with installed project totals driven by size, gauge, insulation, and labor. This article lists realistic low-average-high pricing, common cost drivers, and practical ways to reduce the final price for U.S. commercial and residential HVAC projects.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Spiral Duct Material (per ft) | $3.50 | $6.50 | $11.50 | Assumptions: 10″-48″ diameters, 26–22 ga galvanized. |
| Installed Per Foot (labor + material) | $8 | $16 | $30 | Includes fittings, standard supports, basic insulation. |
| Insulated Spiral Duct (per ft) | $9 | $18 | $36 | Includes 1″–2″ liner or wrap. |
| Project Example (small retail 200 ft) | $1,600 | $3,200 | $6,000 | Assumptions: Midwest labor, standard access. |
Average Spiral Duct Cost Per Foot and Typical Project Totals
Installed spiral duct commonly costs $8-$30 per linear foot, with a national average near $16 per ft for mid-range material and typical labor access. Expect a 200–500 ft commercial run to cost $3,200-$8,000 installed under normal conditions.
Assumptions: standard diameters 10″–30″, 26–22 gauge galvanized, standard hanging, no complex transitions.
How Materials, Labor, Equipment, and Permits Break Down
Major quote parts include duct material, labor to fabricate and install, rigging equipment, and possible permit fees for commercial projects. Materials and labor usually make up 70%–90% of the installed price.
| Materials | Labor | Equipment | Delivery/Disposal | Overhead |
|---|---|---|---|---|
| $3.50-$11.50 per ft (galv, aluminized, stainless) | $4.50-$16 per ft () | $0.50-$3 per ft (crane, lift rental) | $0.10-$1 per ft (packing, waste) | $0.5-$2 per ft (contractor markup) |
Size, Gauge, Insulation, and Run Length That Change Quotes
Diameter, sheet gauge, insulation type, and continuous run length are the strongest price variables—each can shift per-foot pricing substantially. Larger diameters (36″–48″) and heavier gauges (20–18 ga) add $2-$6 per ft; insulation adds $4-$12 per ft depending on thickness and facing.
Numeric thresholds: runs under 50 ft often carry a minimum charge; runs above 200 ft may reduce per-foot fabrication costs by 10%–20% due to batching.
Practical Ways To Lower Spiral Duct Price On A Project
Controlling scope, choosing lighter gauge where code allows, consolidating runs, and providing clear access can cut costs without sacrificing performance. Bundling multiple runs into continuous long lengths and avoiding many small fittings reduces labor and fitting costs by up to 25%.
Other tactics: schedule off-peak installation, remove obstacles beforehand, accept standard finishes rather than specialty coatings, and get three written quotes with identical scope.
How Prices Vary Across U.S. Regions and Job Types
Regional labor and material markets affect final pricing: coastal metro areas commonly pay 10%–35% more than Midwest or rural markets. Expect the West Coast and Northeast metro rates to sit at the high end; Midwest and South often provide lower averages.
| Region | Typical Installed Per Ft | Delta vs. Midwest |
|---|---|---|
| Midwest | $12-$18 per ft | Baseline |
| South | $10-$16 per ft | -5% to -10% |
| Northeast | $14-$24 per ft | +15% to +35% |
| West Coast | $16-$30 per ft | +20% to +40% |
Typical Installation Time, Crew Size, and Labor Rates
Install duration depends on run length, height, and complexity. Small retrofit 100–300 ft jobs typically take 1–3 days; large commercial installs can take several weeks. Common crew makeup is 2–4 installers plus a foreman; expect $75-$125 per hour for qualified HVAC sheet metal labor in many markets.
Example productivity: an experienced 3-person crew may install 50–150 ft of straight spiral duct per 8-hour day depending on height and fittings.
Common Add-Ons, Prep Work, and Fees That Increase Quotes
Accessories and extras that raise price include transition pieces, dampers, countertops, vibration isolation, fire/SMACNA-rated joints, and specialty coatings. Expect transitions, boots, and branch fittings to add $20-$150 per fitting; fire collars and rated penetrations can add $50-$300 each.
| Add-On | Typical Price Range | When Applied |
|---|---|---|
| Round-to-rect transitions | $45-$250 each | Connecting to diffusers or AHU. |
| Dampers and linkages | $35-$180 each | Zone control or fire safety. |
| Insulation (wrap or lined) | $4-$12 per ft | Noise control, condensation prevention. |
| Lift/crane rental | $200-$900 per day | Large-diameter or rooftop installs. |
Three Real-World Quote Examples With Specs and Totals
Example 1: Retail tenant 200 ft 16″–20″ spiral, 26 ga, no insulation, easy access — material $1,300, labor $1,900, total $3,200. Per-foot installed: $16.
Example 2: Light industrial 400 ft, mixed 20″–36″, 22 ga, 1″ insulation — material $4,000, labor $2,800, equipment/overhead $1,200, total $8,000. Per-foot installed: $20.
Example 3: High-end office 250 ft, stainless accents, heavy gauge, numerous transitions — material $3,500, labor $3,750, extras $1,750, total $9,000. Per-foot installed: $36.