The Job Costing Problem
Here is a scenario every contractor knows: You finish a job, cash the check, and feel pretty good about it. Then a few weeks later you look at your bank account and wonder where the money went.
The problem is not that you are a bad contractor. The problem is that you do not have real data on what your jobs actually cost — especially labor.
Why Labor Is the Hard Part
Material costs are easy to track. You get an invoice, you pay it, done. But labor? Labor is where things get fuzzy.
- How many hours did your crew actually spend on that job?
- How much piece work was logged versus how much was actually completed?
- What was your effective labor rate per unit of work?
- Did the job take longer than you estimated?
Most contractors answer these questions with gut feelings, not data. And gut feelings are how you end up working harder every year but not making more money.
What Good Job Costing Looks Like
Real job costing means tracking your actual costs against your estimated costs for every project. At a minimum, you need:
- Total labor hours per project — not per week, per project
- Total piece work production per project — squares, feet, units, whatever you measure
- Total labor cost per project — what you actually paid out
- Comparison to your estimate — are you over or under?
When you have these numbers, you can answer the most important question in your business: Is this job making me money?
How to Start Tracking Job Costs
Step 1: Link Every Time Entry to a Project
This is where most contractors fail. They track total hours per week but do not break it down by project. If you have three jobs running at the same time, you need to know how many hours went to each one.
Step 2: Track Piece Work by Project
Same principle. If your crew is logging squares, those squares need to be tied to a specific job — not just logged as a weekly total.
Step 3: Calculate Your Cost Per Unit
Once you have hours and pieces per project, divide your total labor cost by total production. That gives you your actual cost per unit — cost per square, cost per foot, cost per unit. This is the number that tells you whether your bids are making money.
Step 4: Compare Against Your Estimate
Pull your original estimate. Compare your estimated labor cost to your actual labor cost. If you bid $3,500 in labor and spent $4,200, you need to know that — and you need to know it while you can still do something about it on the next job.
The Bidding Feedback Loop
The real power of job costing is not just knowing what happened on the last job. It is using that data to bid the next one more accurately.
When you know your actual cost per square across 20 completed roofing jobs, your estimates get dramatically better. You stop guessing and start pricing based on real numbers. That is how you protect your margins and stop leaving money on the table.
Tools That Help
You can do basic job costing with a spreadsheet, but it takes discipline and time. Purpose-built tools like Piece Work Pro make it automatic — every time card entry is linked to a project, costs calculate in real time, and you can pull job cost reports whenever you need them.
The point is not which tool you use. The point is that you start tracking. Every day you bid without real cost data is a day you might be losing money without knowing it.