Ductwork Cost Estimator (Material + Labor)

Estimate HVAC ductwork installation costs from linear feet takeoffs, accessory fittings assemblies, insulation wrap, and shop labor hours. Live material and labor splits with bidding severity badges.

Ductwork Cost Estimator Inputs

Project Materials Selection

Duct Material Composition Class

Total Takeoff Straight Run Length (ft)

Fittings & Accessory Components

Active Fittings / Turning Vanes Count (qty)

Blended Cost Per Fitting (Optional) ($)

Exterior Insulation Wrap Cost Per Foot (Optional) ($/ft)

Labor Crew Calibration

Fully Burdened Hourly Shop Labor Rate ($/hr)

Live Results

Total Project Cost

$1,640.00

Calculated Average

$16.40 / linear ft

Material & Fittings Total$990.00

Labor Allocation$650.00 (Approx. 10.0 Total Shop Hours)

Elevated System Pricing — Unit rate registers between $15-$25/ft. Standard residential replacement boundaries are slightly elevated. Verify rigging access parameters to protect margins.

Sheet Metal duct at $7.50/ft material plus 0.1 shop hours per linear foot. Unit-rate severity thresholds: green ≤ $15/ft, yellow $15–$25/ft, red > $25/ft.

How to Use This Ductwork Cost Estimator

Select duct material and straight run length. Choose flex duct ($3.00/ft), sheet metal ($7.50/ft), or ductboard ($5.50/ft) from the material composition dropdown. Enter total takeoff straight run length in feet — the default 100 ft models a typical residential trunk-and-branch replacement scope.
Enter fittings and accessory costs. Set the active fittings or turning vanes count for elbows, transitions, and takeoffs. Optionally override the blended cost per fitting (default $15.00) and exterior insulation wrap cost per foot (default $1.50) to match your supplier pricing.
Set shop labor rate. Enter your fully burdened hourly shop labor rate. Default is $65.00/hr. Labor hours per foot vary by material: flex 0.05 hr/ft, metal 0.10 hr/ft, ductboard 0.08 hr/ft.
Review total project cost and unit rate. The Live Results panel shows total project cost, calculated average cost per linear foot, material & fittings total, and labor allocation with approximate shop hours. All values update instantly as inputs change.
Evaluate bidding severity badge. A RED badge flags high-density unit pricing above $25/linear ft. YELLOW indicates elevated pricing between $15–$25/ft. GREEN confirms competitive nominal production run parameters at or below $15/ft.

Formulas & Example

The ductwork cost engine combines linear footage material lookups, separate accessory fittings assemblies, and labor installation speeds into a single project bid estimate.

Base Material Cost = materialCost[ductType] × linearLengthFeet
Fittings Cost Total = fittingsCount × (fittingsCostPerUnit || $15.00)
Insulation Cost Total = linearLengthFeet × (insulationCostPerFoot || $1.50)
Material Total = Base Material + Fittings + Insulation

Labor Total Hours = laborHoursPerFoot[ductType] × linearLengthFeet
Labor Cost Total = Labor Total Hours × hourlyLaborRate
Final Total Estimate = Material Total + Labor Cost Total
Cost Per Linear Foot = Final Total ÷ linearLengthFeet

Material cost per foot:  flex $3.00 | metal $7.50 | ductboard $5.50
Labor hours per foot:    flex 0.05  | metal 0.10  | ductboard 0.08

Severity thresholds (cost per linear foot):
  GREEN:  ≤ $15.00/ft
  YELLOW: > $15.00 and ≤ $25.00/ft
  RED:    > $25.00/ft

Worked Example

Sheet metal duct, 100 ft straight run, 6 fittings at $15.00 each, $1.50/ft insulation, $65.00/hr labor:

Base Material = $7.50 × 100 = $750.00
Fittings = 6 × $15.00 = $90.00
Insulation = 100 × $1.50 = $150.00
Material Total = $990.00

Labor Hours = 0.10 × 100 = 10.0 hr
Labor Cost = 10.0 × $65.00 = $650.00
Final Total = $990.00 + $650.00 = $1,640.00
Cost Per Linear Foot = $1,640.00 ÷ 100 = $16.40/ft → YELLOW badge

At default inputs with sheet metal, the elevated yellow badge applies because unit rate falls between $15 and $25 per linear foot. Switching to flex duct or reducing fittings count can bring the project into green competitive bidding territory.

Frequently Asked Questions

How is ductwork material cost calculated?▾

Base material cost equals the selected duct type's cost per foot multiplied by straight run length. Flex duct is $3.00/ft, sheet metal is $7.50/ft, and ductboard is $5.50/ft. Fittings cost (count × blended cost per fitting, default $15.00) and insulation wrap (length × cost per foot, default $1.50) are added separately to produce the material & fittings total.

How are labor hours estimated for duct installation?▾

Labor hours per foot depend on duct material: flex 0.05 hr/ft, sheet metal 0.10 hr/ft, ductboard 0.08 hr/ft. Total shop hours equal labor hours per foot × straight run length. Labor cost is total hours × your fully burdened hourly rate.

What do the RED, YELLOW, and GREEN pricing badges mean?▾

Badges evaluate calculated average cost per linear foot. RED (>$25/ft) signals high-density assembly premium — often driven by high fitting counts or rigid metal labor. YELLOW ($15–$25/ft) indicates elevated pricing that may need rigging access verification. GREEN (≤$15/ft) confirms competitive nominal production run parameters.

Should fittings be counted separately from straight run length?▾

Yes. Straight run length covers linear trunk and branch footage only. Fittings — elbows, transitions, takeoffs, and turning vanes — are priced as discrete accessory assemblies at a blended per-unit cost. This separation mirrors standard sheet metal takeoff and fabrication estimating practice.

Can I override default fitting and insulation costs?▾

Yes. The blended cost per fitting and exterior insulation wrap cost per foot are optional override fields. Leave them at defaults ($15.00 and $1.50) for regional baseline estimates, or enter your supplier quotes for project-specific accuracy.

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