Dr. Paul Borosky, DBA, MBA
Construction Guide · Job Costing
Construction Job Costing: How to Know What Each Job Really Made
A busy company can lose money on half its jobs and not know which half. Job costing tells you, while the job is still running. This page shows how to set it up with cost codes you can keep up with. Part of the construction business guide.
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Last Updated: 10/27/2026 · Written by Dr. Paul Borosky, DBA, MBA
The Short Answer
What Is Job Costing?
Textbook Definition
Job costing is the practice of tracking the actual labor, materials, subcontractor, equipment, and other direct costs of each job and comparing them with the estimate.
In Plain English
Job costing means writing down what each job really costs while it is running, and checking it against what you bid. It tells you which jobs make money and which only look busy.
Why It Matters
Why Do Contractors Need to Track Cost by Job?
Direct job costs are most of what you spend. In the NAHB 2026 study of remodelers, the cost of the work took 70.1 cents of every sales dollar in 2024, and trade contractors alone took 30 cents. Costs that big need to be watched job by job. Source: NAHB Eye on Housing.
Without job costing, you cannot tell a good job from a bad one until the money runs out. Company-wide profit can hide a loser. The final payment was supposed to even things out, and it does not, because the loss was already spent.
Timing matters as much as tracking. A cost report that arrives a month after the job closed is a history lesson. A cost report that arrives on Friday is a steering wheel. Better numbers also make every future bid better.
Signs you are flying blind:
- Your bookkeeper can give you company profit, but not profit on one job.
- Hours are guessed on Friday from memory.
- You bid the next job from the last job’s price, not its actual costs.
- Materials land on the company account with no job name.
- A job feels over budget but nobody can say by how much.
- You are counting on the final payment to make the job work.
What It Looks Like
What It Looks Like: The Report That Came Too Late
From the book · Failure #3 · A fictional example
Maria Delgado tracks costs on every job. After each one, she and her bookkeeper compare the estimate to the actual, line by line. It is a good habit. The problem was when she did it.
One winter, the labor line on a retail build-out jumped off the page. The ceilings were higher than on most of her jobs, the crew worked from rolling scaffolds instead of ladders, and everything took longer. The overrun started in week one. Maria did not see it until the job had been over for more than a month. By then she had already bid another store with the same ceiling height, using the same labor numbers.
Her crew lead, Lou, had seen it in the first week. Nobody had asked him. Maria and Lou are fictional characters in the book. The lesson is real: the cost report has to arrive while the job is still open.
The Fix
How to Set Up Job Costing in 6 Steps
You do not need expensive software to start. You need a job number, a short list of cost codes, and one person who owns Friday.
Give every job a number.
Put the job number on every timecard, supplier ticket, sub invoice, and receipt. If a cost has no job number, it cannot be tracked.
Set a short list of cost codes.
Use the same buckets on every job: labor wages, labor burden, materials, subcontractors, equipment and rentals, permits and fees, disposal, and other direct costs. Labor burden is the cost of employing someone beyond their wages, such as employer payroll taxes and workers’ compensation.
Estimate by code.
Build the bid in the same buckets, so you can compare line to line later. The Excel model in the construction template is set up this way.
Capture actual costs every week.
Collect timecards by job, ask suppliers to put job names on tickets, and code sub invoices as they arrive. One person owns this. Do not leave it to memory.
Compare estimate to actual each week.
For every open job, flag any code that is running over by an amount you choose, such as 10%. Ask the crew lead what is behind it. The answer is often in week one.
Close the job and update your numbers.
Within a week of finishing, compare the final totals and write down what you learned, such as ceiling height, access, or a sub that ran long. Feed it into the next bid.
Sample: Kitchen Remodel, Estimate Versus Actual
| Cost code | Estimate | Actual | Over (under) |
|---|---|---|---|
| Labor wages | $14,000 | $15,400 | $1,400 |
| Labor burden (30% of wages) | $4,200 | $4,620 | $420 |
| Materials | $22,000 | $24,100 | $2,100 |
| Subcontractors | $9,000 | $10,800 | $1,800 |
| Equipment and rentals | $800 | $1,150 | $350 |
| Permits and fees | $700 | $700 | $0 |
| Dumpsters and disposal | $600 | $1,300 | $700 |
| Total direct cost | $51,300 | $58,070 | $6,770 |
Example numbers. The 30% burden rate is an illustration. Your rate depends on your payroll taxes, workers’ compensation, and benefits.
What to Track and When
Weekly Versus Monthly: A Simple Rhythm
| Every week | Every month |
|---|---|
| Hours by job and by crew | Overhead spending against your budget |
| Materials bought and delivered | Profit fade on each open job |
| Sub invoices against percent complete | Money owed to you, including retainage |
| Change orders pending and signed | Bank balance against your cash calendar |
A practical rhythm, not an industry standard. Adjust it to your size.
Most failures are not about the system. They are about the habit. In the book, Danny’s wife Carla builds a spreadsheet with a tab for every job, and buys a small notebook for each truck. Danny fills it in for about three weeks. Then the work gets busy and the notebooks stay on the dashboard. Keep the system so small that it still gets used in your busiest month.
Dr. Paul’s Insight
Weekly beats perfect. A rough number on Friday is worth more than an exact number a month later. If you have only one rule, make it this: no job runs more than a week without someone looking at its costs. Once you know your costs, your overhead rate is the next number to get right.
Work With Dr. Paul
Three Ways Dr. Paul Helps Construction Owners
Read the page and fix it yourself, or get help. Here is where each option fits.
Business Consulting
For owners stuck in the cash gap, bidding blind, or running every job themselves. Dr. Paul works with you on bids, cash flow, job costing, and getting you off the jobsite.
See consulting and prices →Business Plan Writing
For contractors applying for a loan, a line of credit, a bigger bond, or an expansion. Dr. Paul writes the plan and the financial projections for you.
Construction business plan writer →Business Plan Template
For owners who want to build it themselves. A construction-specific Word plan plus an Excel model with editable bids, job costing, labor, and equipment.
Get the construction template →FAQ
Job Costing Questions
What is job costing in construction?
What are the main cost categories on a construction job?
How often should I review job costs?
What is labor burden?
Do I need software to track job costs?
Start with the template. Call when you want help setting up your cost codes.
Keep Going
Related Construction Guides
Job costing feeds bids, overhead, and cash. These guides take the next step.
How to Bid a Construction Job
The 8-step bid check, markup versus margin, and a walk-away number.
Overhead Rate
The formula, the base choice, and a worked example.
How to Build Crew Leads
Pick, train, and trust a crew lead, with job-start and job-close checklists.
Managing Subcontractors
License and insurance checks, the agreement, and Florida pay rules.
Why Profitable Contractors Run Out of Cash
The 90-day cash calendar and seven fixes for the gap between payroll and payment.
How to Calculate Cost of Goods Sold
The accounting side of direct job costs.
Sources
Where These Numbers and Rules Come From
Every figure on this page comes from a source below. Dollar examples labeled as examples are illustrations, not projections for your business.
- NAHB Eye on Housing: Remodelers Saw Profit Margin Gains in 2024 (Apr 8, 2026) Remodelers only. Cost of sales 70.1% and trade contractors 30% of revenue, 2024.
- Top 5 Reasons Construction Companies Fail, by Dr. Paul Borosky Failure #3. Maria, Lou, Danny, and Carla are fictional.
- Construction Company Business Plan Template Excel model with editable bids, job costing, labor, and equipment.
Dr. Paul Borosky, DBA, MBA
Business Consultant, Author & Educator | 14+ Years | 1,000+ Clients Served
Dr. Paul Borosky, DBA, MBA is a business consultant, author, and educator, and the founder of Quality Business Plan. He helps small business owners across the United States and Canada, including contractors and specialty trades, with business planning, financial modeling, fractional CFO services, and the everyday problems of businesses that depend too much on their owners. He is the creator of Dr. Paul’s Organize-Plan-Grow™ Strategy, author of numerous published books on Amazon including Top 5 Reasons Construction Companies Fail, and publisher of over 1,000 business-focused videos on YouTube.
This page is for general educational purposes only. It is not legal, financial, tax, accounting, insurance, or other professional advice. Construction laws, licensing rules, and tax rules vary by state and change over time. Dollar examples are illustrations, not projections for your business. Shiny Nail Remodeling, Square-Up Contractors, and the people in them are fictional. For decisions about your own business, consult a qualified professional.