Job Costing for Construction

What Is Job Costing?

Job costing is an accounting method that tracks all costs—labor, materials, subcontractors, equipment, and overhead—to individual projects. Instead of lumping expenses together, every dollar is assigned to a specific job so you can see the true profitability of each project.

For construction companies, job costing is not a nice-to-have—it's the difference between knowing your margins and guessing at them.

Why Contractors Need Job Costing

• Bid accuracy: Historical job costs tell you what projects actually cost—not what you hoped they would.
• Margin protection: Spot cost overruns early, before they eat your profit.
• Better estimates: Use real data from past jobs to build more competitive and accurate bids.
• Bonding capacity: Surety companies want to see project-level profitability, not just top-line revenue.
• Tax strategy: Knowing your costs per job helps your CPA optimize deductions and depreciation.

Job Cost Categories

Every construction job typically includes these cost buckets:

How to Set Up Job Costing

1. Create a chart of accounts structured for construction (separate income and COGS accounts by job type).
2. Set up each project as a "job" or "class" in your accounting software.
3. Code every transaction—every bill, check, payroll entry, and credit card charge—to the correct job and cost category.
4. Track change orders as separate budget line items within each job.
5. Review job cost reports monthly with your project managers to compare estimated vs. actual costs.

Software Options

The right software depends on your company size and complexity:

• QuickBooks Online / Desktop: Best for small to mid-size contractors. Use classes or jobs for project tracking.
• Sage 100 Contractor: Built specifically for construction. Handles complex job costing, AIA billing, and payroll.
• Procore: Project management platform that integrates with accounting software for field-to-office cost tracking.
• Foundation Software: Full construction accounting suite with built-in job costing and reporting.

Job Costing vs. Process Costing

Process costing averages costs across large batches of identical products—it's used in manufacturing. Job costing assigns costs to unique projects—it's the standard for construction because every job is different.

If your accounting system treats all your revenue and expenses as one big pool, you're effectively using process costing—and you have no idea which jobs are profitable.

Scaffold sets up and maintains job costing systems specifically for construction companies. We configure your chart of accounts, code every transaction to the right job and cost category, and deliver monthly job profitability reports so you always know your margins. Whether you're on QuickBooks, Sage, or Procore—we make it work.