I talk to contractors all the time who are genuinely confused about why they're not making more money. Their schedule is full, they're billing decent numbers, the bank account never hits zero. But at the end of the year, there's not a lot left over. Sometimes there's nothing left over. And they can't figure out why.

Nine times out of ten, job costing is the answer. Or more accurately, the lack of it.

What Job Costing Actually Is

Job costing is just tracking what each individual job actually costs you versus what you billed for it. That's it. Labor, materials, subcontractors, equipment, permits, fuel, whatever it took to get that job done. Then you stack that against what the customer paid you and see what you actually made.

Pretty obvious, right? But most trade businesses never actually do it. They track revenue. They track expenses at the company level. But they have no idea which jobs made them money and which ones quietly drained it.

The Problem With Only Looking at Totals

Say you ran 20 jobs last year and netted $80,000 in profit. Feels okay. But what if I told you that 6 of those jobs made you $120,000 and the other 14 lost you $40,000? Would that change how you bid? Would you stop chasing certain types of work? Would you look harder at what's eating your margin on the jobs that go sideways?

Of course it would. But you can't see any of that without job-level data.

Where the Losses Usually Hide

In my experience working with trade businesses, the same patterns show up over and over. The jobs that look profitable in the bid and bleed out in the field usually come down to a few things:

  • Labor hours running over what was estimated, often because nobody's tracking time per job
  • Material costs that got absorbed into a general expense account instead of tied to the job
  • Change orders that got done but never got billed
  • Subcontractor invoices that came in higher than the original quote and just got paid without updating the job cost

None of these are unusual. They're just invisible if you're not tracking by job.

How to Actually Set This Up

You don't need a complicated system. QuickBooks has job costing built in and so does most trade-specific software like Jobber or CoConstruct. The key is making sure every expense that hits your books gets assigned to a job at the time of entry. That means your team has to know which job they're working when they log hours. It means your office has to code every bill to a job before it gets paid.

It takes a little discipline upfront, but once the habit is there it mostly runs itself. And the payoff is that you'll have real numbers to work from when you're estimating the next job, not just gut feel.

What to Do With the Data Once You Have It

Once you're capturing job costs consistently, review them after every completed job. Compare actual to estimated. Look at your labor cost as a percentage of revenue on each job type. Start keeping notes on what kinds of work tend to run over and why. Over time you'll get very good at spotting the jobs worth chasing and the ones you should price higher or walk away from.

That's not bookkeeping. That's how you build a more profitable business.