The Complete Guide to Job Costing for Contractors
Job costing is the backbone of a profitable contracting business. Without it, you're essentially guessing whether each project is making or losing money. This guide breaks down everything you need to know.
What Is Job Costing?
Job costing is the process of tracking all costs associated with a specific project — labor, materials, equipment, subcontractors, and overhead — so you can measure actual profitability against your original estimate.
Why It Matters
Many contractors price jobs based on gut feeling or rough percentages. The problem? Small miscalculations compound across dozens of projects per year, quietly eroding your profits. Accurate job costing reveals:
The Three Pillars of Job Costing
1. Direct Labor Costs
Track every hour your crew spends on a specific job. Include wages, benefits, workers' comp, and payroll taxes. A $25/hour worker actually costs you $35-$40/hour when you factor in burden.
2. Material Costs
Log every material purchase against the correct job. This includes delivery fees, waste factors, and returns. Pro tip: negotiate volume discounts with suppliers and track savings per job.
3. Overhead Allocation
Your trucks, insurance, office rent, and software don't bill to a single job — but they need to be accounted for. Most contractors allocate overhead as a percentage of direct costs or revenue.
Getting Started
Start simple. Track labor hours and material costs per job for 90 days. You'll quickly see patterns that inform better pricing decisions. Then layer in overhead allocation and subcontractor tracking.
The Technology Advantage
Modern job costing software like BidBuild Finance automates much of this process. Time tracking integrates with payroll, purchase orders link to job budgets, and dashboards show real-time profitability at a glance.
Accurate job costing isn't just about knowing your numbers — it's about making confident decisions that grow your business sustainably.