Job costing for small contractors: find out which jobs actually make money

Ask a small contractor which job made the most money last year and the answer usually comes with a pause. The bank balance went up, so something worked. But which job, which type of work, which client? Without job costing, every new bid is a guess based on the last guess.

The four numbers of every job

You do not need an accounting degree. You need four numbers per job:

• Labor: hours worked on that job times the cost of each worker
• Materials: every receipt tied to that job
• Subcontractors: what you paid other trades
• Contract value: the original amount plus approved change orders

Contract value minus the first three is your gross margin on the job. Simple.

The secret is capturing costs where they happen

Job costing fails when someone has to rebuild it at the end of the month from bank statements and memory. It works when costs are captured on the spot:

• The crew clocks in on the job, so hours already belong to it
• The receipt photo is taken at the store counter and tagged to the job
• The sub's invoice is linked to the job when it arrives

Watch the job while it is running

A cost report after the job is over is a history lesson. A cost view during the job is a steering wheel. If labor is at 70% of the budget and the job is at 40% done, you still have time to react: talk to the client about scope, move a crew, review the next phases.

Margin is not decided at the end of the job. It is protected every week while it runs.

Do not forget overhead

Truck payments, insurance, office rent, software, phones. These costs do not belong to one job, but every job has to help pay them. Track overhead separately, know your monthly total and make sure your bids cover it.

Turn the numbers into better bids

After a few months of real job costing, patterns appear. Maybe decks are great margin and remodels are not. Maybe one client always generates extra hours. That is the information that makes your next estimate sharper.

Four Built connects the time clock, receipts, subcontractors and invoices to each job, so you see labor cost, material cost and what is left to receive while the job is still running. The Build plan adds overhead tracking with categories and monthly limits.