Buying guideAccounting & bookkeeping
Construction Job Costing Software for Small Contractors and Subcontractors
How small contractors and subcontractors track costs per job: labor, materials, retainage and work in progress, and what software should do.
Construction job costing software tracks labor, materials, subcontractors and equipment against each project’s budget while the work is happening, not just at the end. For small contractors and subcontractors, it matters most on jobs that run for weeks, are billed in stages and hold back retainage, because that’s where costs and cash drift apart.
This guide covers what construction job costing adds to basic job costing, how to track work in progress (WIP) and retainage, and how to choose software. For the basics, see our pillar guide to job costing software.
What makes construction job costing different
Service jobs are short: cost them after the visit. Construction jobs need costing during the work, because decisions (overtime, change orders, material substitutions) are made while the budget is still open.
| Element | Service job costing | Construction job costing |
|---|---|---|
| Job length | Hours or days | Weeks or months |
| Budget | Quote total | Budget by cost code (labor, material, sub, equipment) |
| Billing | One invoice | Progress billing, often with retainage |
| Changes | Rare | Change orders that revise budget and contract |
| Key report | Margin per job | Estimated vs. actual by cost code, WIP |
Cost codes: the foundation
Cost codes split a project budget into categories you can track. A small contractor doesn’t need hundreds; a short list used consistently works better. Example for a small electrical or mechanical subcontractor:
| Code | Description |
|---|---|
| 01 | Mobilization and layout |
| 02 | Rough-in labor |
| 03 | Rough-in materials |
| 04 | Trim and finish labor |
| 05 | Fixtures and equipment |
| 06 | Subcontractors |
| 07 | Equipment rental |
| 08 | Permits and inspections |
| 09 | Change orders |
Time and purchases are coded as they happen. The software then compares actual cost by code with the budget.
Construction work in progress tracking template (Excel)
A WIP schedule shows, for each open project, how much of the contract you’ve earned compared with how much you’ve billed. It flags jobs where you’re overbilled (billed ahead of work) or underbilled (work done but not billed).
| Column | Formula or content |
|---|---|
| Project | Name or number |
| Contract value | Original contract + approved change orders |
| Estimated total cost | Current estimate at completion |
| Cost to date | From job costing |
| % complete (cost basis) | Cost to date ÷ estimated total cost |
| Earned revenue | Contract value × % complete |
| Billed to date | From invoices |
| Over / (under) billed | Billed to date − earned revenue |
| Estimated gross profit | Contract value − estimated total cost |
Hypothetical example: contract $80,000, estimated cost $62,000, cost to date $31,000. The job is 50% complete on a cost basis, so earned revenue is $40,000. If you’ve billed $46,000, you’re overbilled by $6,000: cash looks good now, but the remaining work will bring in less than it costs to finish unless the estimate is wrong. Update the estimated total cost monthly, because the whole calculation depends on it.
Construction retainage accounts receivable spreadsheet template
Retainage is part of your receivables, but it’s paid on different conditions. Track it separately:
| Project | Customer | Retainage % | Retainage held to date | Release condition | Expected release | Requested on | Received on |
|---|
Review it monthly with your aged receivables. On small contracting businesses, retainage can be a large part of the money owed, and release requests often need paperwork (final lien waivers, closeout documents) that’s easy to delay.
Labor: the cost that moves the most
For most small contractors, labor is the most variable cost. Track it by project and cost code, daily:
- Crew members log hours to a project and code from a phone or a daily timesheet.
- The foreman reviews and approves at the end of the day.
- Loaded labor rates (wage plus taxes, insurance and benefits) are used in reports, not bare wages.
For estimating labor before the job, our mechanical contractor estimating guide includes a labor estimate template with labor units and condition factors.
Best construction job costing software: how to choose
There’s no single best option; it depends on where your data lives and how complex your projects are.
| Option | Strength | Watch out for |
|---|---|---|
| Accounting software with projects | One set of books; your accountant already uses it | Field time and change orders may need workarounds |
| Contractor project and billing software | Progress billing, retainage, change orders built in | Another system to sync with accounting |
| Spreadsheets | Free, flexible | Manual, error-prone across many projects |
Examples of what vendors publish, checked October 28, 2026:
- Knowify lists progress billing, AIA pay apps with retainage tracking, change orders and QuickBooks Online sync on all plans, and job costing on its Advanced and Enterprise plans.
- QuickBooks Online lists “Track project profitability” on Plus and “Advanced project financials” on Advanced. The Simple Start and Essentials plans don’t list project features. Our guide to accounting software with job costing explains when that’s enough.
Questions for any demo:
- Can I set a budget by cost code and see actual vs. budget during the job?
- How do field hours get to the project, and who approves them?
- How do change orders update both the budget and the contract value?
- Is retainage tracked per invoice and per project?
- Can it produce a WIP report, or export the data to build one?
- What syncs to accounting, and how often?
Frequently asked questions
What’s the best job costing software for construction if I’m a subcontractor? Look for progress billing and retainage first, because general contractors usually require them. Then check how field hours reach the system.
Do I need a WIP report as a small contractor? If you have several projects open at month-end and bill in stages, yes: it’s the clearest way to see if you’re ahead or behind on cash. Banks and surety providers may also ask for one.
How often should I update cost estimates? At least monthly, and whenever a change order or a significant problem changes the expected cost.
Where does invoicing fit? Progress invoices are the revenue side of each project. See our contractor invoicing guide.
Sources
- Knowify pricing, Knowify (accessed October 28, 2026)
- QuickBooks Online plans and pricing, Intuit (accessed October 28, 2026)
How we researched this
This article is based on documentation research, including the sources listed above. We have not run hands-on tests of specific products for this piece. Read our research methodology. Spotted an error? See our corrections policy.