What Is Job Costing?

Job costing is tracking all expenses for a specific job so you can measure profit.

This includes:

  • Materials

  • Labor

  • Overhead

Without this, you’re guessing.

Step 1: Track Material Costs

Record everything used on the job:

  • Lumber, drywall, flooring

  • Fasteners, adhesives

  • Waste and extra materials

Even small costs add up.

Step 2: Track Labor Accurately

Don’t guess hours—track them.

  • Time spent on-site

  • Prep and cleanup time

  • Travel (if applicable)

Labor is usually your biggest cost.

Step 3: Include Overhead

This is where most contractors lose profit.

Include:

  • Fuel

  • Tools and maintenance

  • Insurance

  • Admin time

Simple rule: add 10–20% of job costs if you’re not tracking precisely.

Step 4: Compare Estimated vs Actual Costs

This is the most important step.

After the job:

  • Compare your quote vs actual costs

  • Identify where you underpriced

This is how you improve over time.

Step 5: Calculate Your Profit

Use this formula:

Profit = Total Price – Total Costs

If you’re not consistently hitting your target margin, your pricing needs work.

Common Job Costing Mistakes

  • ❌ Not tracking small expenses

  • ❌ Ignoring overhead

  • ❌ Guessing labor time

  • ❌ Never reviewing completed jobs

These lead to hidden losses.

How to Make Job Costing Easy

Spreadsheets work—but they get messy fast.

A better system lets you:

  • Store material and labor costs

  • Track jobs in real time

  • See profit instantly

  • Improve pricing on future jobs

Bottom Line

If you want to maximize profit, you need to track your numbers.

Simple job costing helps you:

  • Price more accurately

  • Avoid losses

  • Grow your business

No tracking = no control.