How do you calculate labor cost per unit for an attachment lot?

Multiply direct labor hours by your loaded labor and burden rate, apply the labor scope percentage, then add fixed setup, training, and support labor. With 34 hours at $86, 100% scope, plus $520 fixed, the total is $3,444 of labor for the lot.

What is the difference between variable and fixed labor here?

Variable labor scales with hours worked on the lot — here $2,924 from 34 hours at $86. Fixed labor ($520) is setup, weld-procedure training, and support that you pay once per job no matter the quantity.

Why is my per-hour basis higher than my loaded rate?

The $101.29 per-hour basis is the total labor of $3,444 spread over 34 hours, so it includes the fixed $520. Your raw loaded rate is $86; the gap is the fixed labor diluted across the hours booked.

Should I include shop burden in the loaded rate?

Yes. The rate should carry direct wages plus employer taxes, benefits, supervision, consumables, and an allocation of shop overhead. A bare hourly wage will understate true labor cost by 40 to 80 percent on most fabrication floors.

What labor scope should I enter?

Use 100% when the hours cover the full attachment build. Drop below 100% only when some labor is captured elsewhere — for example if final paint or hydraulic hookup is billed on a separate line and you don't want to double-count it.

How can I lower labor cost per unit on attachments?

Spread fixed setup over larger lots, build weld and fit-up fixtures to cut variable hours, and standardize cut files so training time drops. Reducing the 34 hours or the $520 fixed both pull the $101.29 per-hour basis down.

Construction Machinery & Attachments calculator

Labor per Unit Calculator

Labor per Unit tells an attachment fabricator what it truly costs in human time to build, fit, and finish a lot of buckets, grapples, couplers, or thumbs. It combines the variable labor hours at your loaded shop rate with the fixed setup, weld-procedure training, and support labor that every job carries whether you build one unit or fifty. Estimators and shop managers in construction machinery use it to defend quotes, compare a fabrication cell against an outsourced supplier, and catch lots where setup time is quietly eating the margin. Because attachment work is heavy on fit-up, weld, and gusset labor rather than raw machine time, getting the loaded rate and fixed labor right is what separates a profitable bid from a loss.

What this calculator does

Estimate labor cost per construction attachment or machine assembly unit.
checking labor cost basis for quotes and production plans
It computes total attachment labor cost by multiplying labor hours by the loaded burden rate, applying the included scope, then adding fixed setup, training, and support labor.

Formula used

Variable attachment labor cost = direct labor hours for the attachment lot × loaded labor and shop burden rate × labor scope included
Total attachment labor cost = variable attachment labor cost + fixed setup, training, and support labor

Inputs explained

Direct labor hours booked to the attachment lot:
Loaded labor and shop burden rate:
Labor scope included in this cost:
Fixed setup, training, and support labor:

How to use the result

Use it when quoting an attachment lot, deciding make-versus-buy on a fabrication cell, or auditing why a finished job came in over the estimated labor budget.
It only models labor — steel, hardware, paint, hydraulics, and outside processing like machining or galvanizing must be costed separately and added to reach a full unit cost.

Current U.S. benchmarks

U.S. housing starts run at 1,177k per year (Census, May 2026), down 8.7% from a year earlier, the demand driver for building products.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).
The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate labor cost per unit for an attachment lot? Multiply direct labor hours by your loaded labor and burden rate, apply the labor scope percentage, then add fixed setup, training, and support labor. With 34 hours at $86, 100% scope, plus $520 fixed, the total is $3,444 of labor for the lot.
What is the difference between variable and fixed labor here? Variable labor scales with hours worked on the lot — here $2,924 from 34 hours at $86. Fixed labor ($520) is setup, weld-procedure training, and support that you pay once per job no matter the quantity.
Why is my per-hour basis higher than my loaded rate? The $101.29 per-hour basis is the total labor of $3,444 spread over 34 hours, so it includes the fixed $520. Your raw loaded rate is $86; the gap is the fixed labor diluted across the hours booked.
Should I include shop burden in the loaded rate? Yes. The rate should carry direct wages plus employer taxes, benefits, supervision, consumables, and an allocation of shop overhead. A bare hourly wage will understate true labor cost by 40 to 80 percent on most fabrication floors.
What labor scope should I enter? Use 100% when the hours cover the full attachment build. Drop below 100% only when some labor is captured elsewhere — for example if final paint or hydraulic hookup is billed on a separate line and you don't want to double-count it.

Last reviewed 2026-05-12.