A busy construction company can still lose money.
Materials may cost more than expected. Labor hours can exceed the estimate. A change order may be completed but never billed. Each problem can seem small while a project is underway, but together they can erase the profit that was built into the original bid.
This is especially relevant in 2026. The Associated General Contractors of America reported that the price index for inputs to new nonresidential construction increased 8.9% between August 2025 and August 2026. Some materials experienced even larger increases, including aluminum, steel, copper, and liquid asphalt. (Associated General Contractors of America)
When costs move quickly, contractors need current financial information. Waiting until the end of a project to calculate the result may mean waiting too long to protect the margin.
Here are seven bookkeeping habits that can help.
1. Compare the estimate with actual costs
A project estimate establishes what the job is expected to cost. Job costing shows what is actually happening.
Labor, materials, equipment, subcontractor charges, permits, and other direct expenses should be assigned to the correct job. Comparing those costs with the estimate can reveal an overage while there is still time to respond.
Ask three questions during every job review:
- How much did we expect to spend?
- How much have we spent so far?
- How much will it take to finish?
The third question is easy to overlook. A job can appear profitable today while still carrying significant unfinished costs.
2. Update material assumptions before submitting a bid
An old cost list can create a bad estimate before work begins. Review current supplier pricing, delivery charges, fuel costs, and product availability when preparing a bid.
For materials with unstable prices, document how long the quoted price is valid. Contractors may also want to discuss escalation clauses, allowances, or substitutions with their legal and estimating professionals when appropriate.
Your bookkeeping records can help identify which materials have produced the largest cost differences on recent jobs.
3. Record labor by project
Payroll is one of the largest expenses for many contractors. If labor is recorded only as a companywide expense, it becomes difficult to determine which jobs are making money.
Accurate time tracking should identify the project and, when useful, the type of work performed. This helps compare estimated labor hours with actual hours and may reveal recurring estimating or scheduling problems.
4. Document every change order
Additional work does not automatically become additional revenue.
Record each change order when the scope changes. Keep the customer’s approval, added cost, billing amount, and invoice status together. Then confirm that every approved change appears on the next invoice or payment application.
A simple change order log can prevent completed work from being forgotten.
5. Review committed costs
Bills already entered into the accounting system show only part of a project’s financial position. Purchase orders, subcontract agreements, and other commitments can represent costs that have not arrived yet.
Reviewing committed costs alongside recorded expenses provides a clearer picture of what remains to be paid. It also reduces the chance of treating money as profit when it is already committed elsewhere.
6. Track billing and cash separately
Revenue, accounts receivable, and cash are related, but they are not the same.
A contractor may have completed profitable work and still struggle to meet payroll if billing is delayed or customers pay slowly. Review unpaid invoices, payment application status, retainage, and expected collection dates regularly.
A short cash flow forecast can show whether expected receipts will cover upcoming payroll, supplier payments, taxes, and overhead.
7. Hold regular job profitability reviews
Job costing works best as an ongoing process. Set aside time weekly or monthly to review active projects.
Look for:
- Material costs above the estimate
- Labor hours running over budget
- Unbilled change orders
- Missing vendor or subcontractor charges
- Aging customer balances
- Retainage that is ready to collect
- Jobs likely to finish below the expected margin
The goal is to identify the reason behind a variance and act before it grows.
Clear books support better construction decisions
Rising costs do not have to become a year-end surprise. Consistent job costing gives contractors a clearer view of project performance, cash needs, and overall profitability.
When your bookkeeping is current and organized by job, you can see which projects are working, which ones require attention, and whether the next opportunity makes financial sense.
Need help creating clearer financial records for your construction business? Contact Counting Construction Beans to discuss bookkeeping support designed for contractors, builders, and construction-related businesses.
This article provides general business information and is not tax, legal, or financial advice.