To stop managing construction costs with a rear-view mirror, you need to see where each job is heading, not just what has already been spent. That means tracking committed costs (orders and subcontracts) as well as invoices, comparing each job to its budget often enough to act, and giving project managers a live view of their own numbers. The tools to do this already exist in Xero, MYOB and common job management software; what's usually missing is connecting them and agreeing on how the information flows.
Most construction cost management looks backwards. The work gets done, the invoices arrive, someone enters them, the accounts are reconciled, and eventually a report shows what happened weeks ago. By then you can't change anything. You are steering by looking at the road behind you.
Why backward-looking cost reports fail builders
Construction costs don't wait for month end. A subcontractor's variation is agreed on site, materials are ordered over the phone, extra labour goes onto a job to catch up on a delay. All of these commit money long before an invoice is entered in the accounts.
If your only view of job cost comes from invoices that have been processed, there is always a gap between what you have spent and what you know you have spent. On a small job the gap is uncomfortable. On a large job, or across several jobs at once, it can turn a profitable project into a loss before anyone notices.
Three changes that let you look forward
1. Track committed costs, not just actual costs
Actual costs only appear when an invoice is processed. But the commitment exists from the moment a purchase order is raised or a subcontract is signed. Track committed costs and you can see the likely final cost of a job before the invoices arrive, which gives you time to act on problems while they are still small.
In practice this means every order and subcontract is recorded against a job and cost code when it is placed, not when the bill turns up.
2. Compare to budget often, not just at month end
A monthly cost review is a post-mortem. A frequent comparison is a check-up. You don't need a detailed analysis every day, just a simple traffic light for each job: is it tracking green, amber or red against budget? If your systems are connected, this can update itself.
3. Put cost data in front of project managers
In many construction businesses, cost data lives with the accounts team. The project manager, who is best placed to act on cost problems, doesn't see the numbers until a formal report is produced. Give your project managers a live budget-versus-actual view of their own jobs, including committed costs. They will make better calls, sooner.
Setting it up in practice
The technology exists today. Xero and MYOB both support tracking costs by job. Job management platforms can show budget against actual. Reporting tools like Power BI can pull data from several systems into one view. The work is in setting it up and committing to using it.
A practical order to tackle it:
- Agree on cost codes. Estimating, purchasing and accounts all need to use the same codes for the same things, or nothing will line up.
- Load budgets by job and cost code. Your estimate becomes the budget the job is measured against.
- Record commitments when they are made. Purchase orders and subcontracts go in at the point of ordering, with the job and cost code.
- Connect timesheets to jobs. Labour is often the cost that drifts most quietly. Hours need to land on the right job quickly.
- Build one simple report. Budget, committed, actual and forecast final cost for each job, refreshed automatically. Add detail only once people are using it.
Our page on construction job costing software explains how we connect these pieces for builders using Xero or MYOB, and our post on WIP reporting for builders in Xero covers the month-end side.
Frequently asked questions
What is the difference between committed cost and actual cost?
Actual cost is what has been invoiced and entered in your accounts. Committed cost is what you have agreed to spend through purchase orders and subcontracts, whether or not the invoice has arrived. Committed cost shows you where a job is heading; actual cost shows where it has been.
Can we do this in Xero or MYOB alone?
Both can track costs by job, but neither is built to manage purchase order commitments, cost codes and forecasts in the way most builders need. They usually work best alongside a job management system or a reporting layer that pulls the pieces together.
How often should we compare job costs to budget?
Often enough to act. For most builders that means at least weekly on active jobs, with an automatic view project managers can check whenever they need it. Month-end reviews are still useful for the accounts, but they are too late for steering a job.
Do project managers really need to see the costs?
Yes. They are the people who can change what happens on site. A project manager who can see that a cost code is running over can do something about it the same week.
If you'd like to see your job costs while you can still change them, book a free initial chat.