Steelpoint Blog

Job Costing for Contractors: How to Know Which Jobs Make You Money

Many contractors judge a project’s success based on one simple question:

“Did I make money?”

Unfortunately, the answer is not always obvious.

A project may generate significant revenue, but once labour, materials, fuel, equipment, permits, and subcontractor costs are considered, the actual profit may be far lower than expected.

This is where job costing for contractors becomes valuable.

By tracking costs for each project individually, contractors gain a clearer understanding of profitability and can make better decisions when quoting future work.

Table of Contents

1. What Is Job Costing?
2. Why Many Contractors Struggle to Measure Profitability
3. The Costs That Should Be Tracked
4. How Job Costing Improves Estimates
5. Why Bookkeeping Matters for Job Costing
6. Common Job Costing Mistakes
7. Frequently Asked Questions
8. How Steelpoint Accounting Can Help

What Is Job Costing?

Job costing is the process of tracking expenses and revenue for a specific project.

Instead of viewing all income and expenses together, costs are assigned to individual jobs so you can determine:

• Project revenue
• Material costs
• Labour costs
• Equipment expenses
• Subcontractor costs
• Travel and fuel expenses
• Overall profitability

The result is a more accurate picture of how each project performs.

Why Many Contractors Struggle to Measure Profitability

Many contractors know what they invoiced a customer, but they do not always know the true cost of completing the work.

For example, a $15,000 project may initially appear successful.

However, once expenses are considered:

• Materials: $5,000
• Labour: $4,500
• Fuel and travel: $400
• Equipment costs: $600
• Subcontractors: $2,000

The remaining profit is much smaller than the original invoice amount suggests.

Without proper bookkeeping, these costs can easily become hidden within general business expenses.

The Costs That Should Be Tracked

Accurate job costing for contractors requires consistent tracking of project-related expenses.

Common categories include:

Materials

• Lumber
• Electrical supplies
• Plumbing materials
• Fasteners
• Finishing products

Labour

• Employee wages
• Payroll burdens
• Overtime
• Benefits

Equipment

• Rentals
• Maintenance
• Repairs
• Depreciation considerations

Subcontractors

• Electrical contractors
• Plumbers
• Drywall specialists
• Roofing crews
• Other trades

Vehicle and Travel Costs

• Fuel
• Parking
• Travel expenses
• Mileage

Tracking these categories separately provides valuable insight into project performance.

How Job Costing Improves Estimates

One of the greatest benefits of job costing is improving future estimates.

If you know the actual cost of previous projects, you can build more accurate quotes moving forward.

For example:

You may discover that:

• Certain jobs consistently exceed estimates
• Material costs are higher than expected
• Travel expenses are affecting margins
• Specific project types generate stronger profits

This information allows contractors to price future work more confidently.

Why Bookkeeping Matters for Job Costing

Job costing depends on accurate bookkeeping.

If expenses are not recorded correctly, project profitability becomes difficult to measure.

Monthly bookkeeping helps ensure:

• Costs are categorized properly
• Transactions are assigned to projects
• Reports remain accurate
• Financial information stays current

The better the bookkeeping system, the more useful the job costing data becomes.

Common Job Costing Mistakes

Not Tracking Small Expenses

Small purchases such as fuel, hardware, fasteners, and consumables can add up significantly over time.

Forgetting Equipment Costs

Equipment ownership and rentals should be considered when evaluating project profitability.

Ignoring Labour Burden

Wages alone do not represent the full cost of labour.

Reviewing Projects Too Late

Waiting until year-end often limits the usefulness of profitability information.

Failing to Compare Estimates to Actual Results

Reviewing completed projects helps identify opportunities to improve future quoting accuracy.

Frequently Asked Questions

Do small contractors need job costing?

Yes. Even sole proprietors can benefit from understanding which projects generate the strongest returns.

Can QuickBooks track job costs?

Yes. Proper setup and bookkeeping procedures can help track project-related income and expenses.

Is job costing only for large construction companies?

No. Many small contractors, trades businesses, and service providers use job costing to improve profitability.

How often should job costs be reviewed?

Many contractors benefit from reviewing costs monthly and evaluating profitability after project completion.

Why Profitability Matters More Than Revenue

Revenue alone does not tell the full story.

A contractor generating $500,000 in revenue may be less profitable than a contractor generating $350,000 if costs are not managed effectively.

Understanding project profitability helps business owners:

• improve pricing
• identify profitable services
• control expenses
• make better business decisions
• increase long-term profitability

How Steelpoint Accounting Can Help

At Steelpoint Accounting, we help contractors and trades businesses maintain organized bookkeeping records that support accurate job costing and financial reporting.

Our services include:

• monthly bookkeeping
• catch-up bookkeeping
• expense tracking
• QuickBooks support
• financial reporting
• HST tracking
• bookkeeping cleanup

We help business owners gain better visibility into where their money is going and which projects are producing the strongest results.

Want Better Insight Into Your Job Profitability?

Understanding your numbers is one of the most effective ways to improve business performance.

Visit Steelpoint Accounting to learn more about our bookkeeping services for contractors and small businesses across Ontario.