Article written by Sue Hirst, 13 February, 2026
If you don’t track costs against specific project codes in real-time, you are not managing; you’re guessing. To stop working for free, you must ditch “market rates,” charge for every variation immediately, and understand the difference between markup and margin.
You are building houses, but are you building wealth? It is entirely possible to turn over $3 million a year and make less than a first-year apprentice.
Industry benchmarks indicate that while gross margins should sit between 15% and 25%, many small-to-medium builders operate at a net profit of less than 3% due to poor cost tracking.
If you don’t know exactly which jobs are making money and which ones are bleeding you dry, you are flying blind. This article by Sue Hirst, founder of CFO on Call, will help you move from “envelope math” to precision job costing.
The Under-Quoting Trap: Why “Market Rates” are Killing Your Margins
Most builders price jobs based on what they think they can get, or worse, what the bloke down the road is charging. This is a fast track to insolvency.
According to the Australian Bureau of Statistics (ABS), the construction industry has one of the highest business exit rates in the country, often exceeding 13% annually, as builders fail to price for their specific overheads.
The builder down the road might be going broke—don’t follow him!
“How to price day rates, labour, and materials correctly to cover overheads?”
Your price cannot just be materials plus labour plus 20%. That calculation ignores the beast that eats your profit: Overheads. You need to calculate your “True Cost.” Calculating this true cost involves summing up your fixed costs (vehicle leases, insurance, rent, software subscriptions, admin wages) and dividing that by your billable hours. If you don’t allocate a portion of your office rent to every hour you spend on site, you are paying for that rent out of your own pocket.
The “Invisible Burden”: Why your hourly rate is more than just wages.
You might pay a carpenter $45 an hour, but he costs you closer to $65. This is the “Labour Burden.” The Labour Burden includes Superannuation (currently 11.5%), WorkCover, Leave Loading, Public Holidays, and Sick Days. If you quote his time at $55 because “that sounds fair,” you are losing money every time he picks up a hammer.
Why quoting “the same as the other guy” is a race to the bottom.
When you price match a competitor without seeing their P&L, you are assuming they know their numbers. In the construction industry, that is a dangerous assumption. Establish your own rates based on your overheads and your profit goals. If that makes you more expensive, sell on value, not price.
From Text Messages to Tech: Ending the Chaos of “Spreadsheet Accounting”
You cannot run a million-dollar company using a mixture of Excel, SMS, and memory. The “systems gap” is where revenue goes to die.
Why your phone’s photo gallery isn’t a job-costing system.
Taking a photo of a Bunnings receipt and leaving it on the dashboard is not bookkeeping. It is a recipe for lost tax deductions. If a cost isn’t logged against a job code immediately, it inevitably gets absorbed as “general expenses,” killing your job profitability visibility.
The “Midnight Admin” problem: why manual entry leads to missed claims.
After a 10-hour day on the tools, the last thing you want to do is data entry. This is “Midnight Admin.” Midnight admin leads to fatigue-based errors and missed invoices. If you rely on your memory to invoice clients at the end of the month, you will forget the $400 of extras you picked up on Tuesday.
Building a single source of truth: Integrating job management with your accounting software.
You need a tech stack that talks. Your project management tool (like Buildxact, CoConstruct, or Fergus) must integrate directly with Xero or QuickBooks. When a purchase order is raised, it should sync. When an invoice is sent, it should match. One entry, two systems, zero double-handling.
The Profit Killer: Why Untracked Variations are Stealing Your Take-Home Pay
Scope creep is the silent killer of margin. A “quick favour” here and a “minor change” there can add up to thousands of dollars of unbilled labour over a six-month build.
The “I’ll sort it later” mistake: The true cost of undocumented variations.
“Just move that wall a bit,” says the client. “No worries,” you say. You move the wall. It takes four hours and $300 in materials. You don’t write it down because you’re busy. By the time the final invoice goes out, you’ve forgotten, or you feel awkward bringing it up. You just did that work for free.
How to capture and bill for changes before the crew leaves the site.
The rule is simple: No signature, no work. Use your phone to raise a variation order immediately. Show the client the cost, get them to digitally sign it on the spot, and then do the work. It removes the argument at the end of the job because the price was agreed upon before the cost was incurred.
Turning variations from a headache into a profit centre.
Variations should be your highest margin work. They disrupt your schedule and require admin; therefore, they should command a premium. Stop viewing them as annoyances and start viewing them as profit centres (but only if you have the discipline to document them).
Real-Time Visibility: Using WIP and Profitability Reports to Pivot Mid-Job
Most builders do “Autopsy Accounting”. They wait until the project is dead and buried to cut it open and see if they made money. That is too late.
“How do you track whether each job actually made a profit?”
You need to stop looking at your overall bank balance and start looking at “Gross Profit per Project.” Your accounting file should be set up with Tracking Categories (Xero) or Classes (QuickBooks). Every invoice and every wage hour must be assigned to a specific address. This allows you to pull a report that says: 12 Smith Street: Income $50k, Cost $42k, Profit $8k.
WIP Reports: Knowing your financial position during the build, not after.
A Work in Progress (WIP) report tells you if you have over-billed or under-billed relative to the completion stage. If you have billed 50% of the contract value but have spent 70% of your budget, you are in trouble. A WIP report acts as the “Check Engine” light for your project, allowing you to pivot before the damage is permanent.
The “Stop Taking This Work” list: Using data to fire your least profitable clients.
Data reveals the truth. You might find that while your new builds are hitting 18% margin, your renovation jobs are hitting 4% because of unforeseen issues. Use this data to curate your pipeline. Stop taking the work that makes you busy but keeps you broke.
The Virtual CFO Advantage: Setting Professional Rate Sheets and Mark-ups
A Virtual CFO (vCFO) helps you set the strategy before the shovel hits the dirt. This starts with understanding the math of pricing.
Calculating your “Break-Even” point for every hour on site.
Before you add a cent of profit, you must know your Break-Even Hourly Rate. (Total Overheads + Total Direct Labour Costs) ÷ Total Billable Hours. If your break-even is $75/hr and you are charging $70/hr to win the job, you are literally paying the client to build their house.
Why “Markup” and “Margin” are not the same thing (and why it matters).
This is the most common math error in construction.
- Markup: Adding % to the cost. ($100 cost + 20% markup = $120 price).
- Margin: The % of the price that is profit. ($20 profit ÷ $120 price = 16.6% margin).
If you need a 20% margin to run your business, but you only add a 20% markup, you are falling short on every single invoice.
The role of a vCFO in auditing your pricing strategy quarterly.
Material prices fluctuate. Insurance premiums rise. If your rate sheet is the same as it was in 2023, you have effectively given yourself a pay cut. A Virtual CFO reviews your rates quarterly to ensure your pricing rises in line with your costs, protecting your bottom line.
Stop “flying by the seat of your pants” with cash flow uncertainty and start making the strategic, data-driven decisions your business deserves. Our business accounting for construction partners you with an expert Virtual CFO to significantly boost your profitability and regain control—contact us today for a free consultation to see how we can help your business thrive.
