Most builders know exactly what a job has cost so far.
The problem is knowing what it’s going to cost to finish.
A project can look profitable today, but hidden delays, labour inefficiencies, material increases, or unapproved variations can quickly eat into margin. By the time it shows up in the financial statements, it’s usually too late to fix.
That’s why the best builders don’t just track what has happened. They forecast what happens next.
Looking Back Won’t Protect Future Profit
Most business reports are historical.
Your:
- Profit & Loss tells you what happened last month.
- Bank balance tells you where cash sits today.
- BAS tells you what happened last quarter.
None of them tell you whether the job you’re building right now will finish on budget.
Forecasting fills that gap.
It helps answer questions like:
- Will this project finish at the margin we priced?
- Are labour costs running higher than expected?
- Have we allowed for recent supplier increases?
- Will cashflow become tight in the coming months?
- Which jobs need immediate attention?
What Good Forecasting Looks Like
Good forecasting isn’t complicated.
It starts with asking one simple question:
“Knowing what we know today, what will this project cost to finish?”
To answer it properly, builders need to review:
- Actual costs to date
- Remaining costs to complete
- Variations
- Programme delays
- Labour productivity
- Supplier pricing changes
- Site risks and issues
The goal is to create a realistic picture of where the project is heading, not where it started.
The Most Important Number: Cost to Complete
Many builders focus heavily on what they’ve spent.
The smarter question is:
What still needs to be spent?
A project might be tracking well today, but if there is $300,000 worth of work remaining and that work is underestimated, profit can disappear very quickly.
Understanding the true cost to complete is often the difference between finishing a project successfully and being surprised at the end.
Why WIP Doesn’t Tell the Full Story
Work In Progress (WIP) is an important management tool, but it has limitations.
A project can show a healthy WIP position while future costs are building in the background.
That’s why WIP should always be considered alongside:
- Forecast cost to complete
- Forecast job margin
- Projected cashflow
- Known project risks
Looking at all four together provides a much clearer picture of project performance.
Stress-Test Your Jobs
Every major project should be tested against a few simple scenarios:
- What if a key trade is delayed?
- What if labour productivity drops?
- What if material costs increase?
- What if a variation isn’t approved?
- What if practical completion moves back a month?
The purpose isn’t to predict every problem.
It’s to identify risks early enough to do something about them.
Forecasting Protects Cashflow
Many builders think forecasting is about profit.
In reality, it’s often about cashflow.
A project can be profitable on paper and still create serious financial stress if claims, supplier payments and labour commitments aren’t planned properly.
Forecasting helps identify future cash demands before they become emergencies.
The Bottom Line
The most successful builders don’t wait until year-end to find out whether they’ve made money.
They review projects regularly.
They challenge assumptions.
They estimate costs to complete honestly.
And they use forecasting to make decisions before problems arise.
Financial reports tell you where you’ve been. Forecasting helps you see where you’re going.
That’s often the difference between a project that simply gets finished and a project that finishes profitably.
