Ask a builder how a job is tracking and you’ll often get a confident answer. Ask to see the numbers that prove it and the picture gets murkier — costs are weeks behind, committed purchase orders aren’t in the system, and the “margin” is really just the original quote minus whatever invoices have landed so far. That gap between what the site knows and what the accounts show is where construction businesses quietly lose money, and it’s the first thing a bank manager probes when you ask for a bigger facility.

Job costing that a lender trusts isn’t more detailed bookkeeping after the fact. It’s a live view of each job — what it will cost to finish, not just what it has cost so far.

Retrospective costing is the problem

Most job costing is backward-looking: it tells you the margin on a job after the invoices are in, which is usually after the decisions that affected that margin were already made. By then a variation has been done for free, a subcontractor claim has crept past budget, or materials were ordered at a price no one checked. The number is accurate and useless — accurate about a result you can no longer change.

Live job costing flips this. It answers the only question that matters mid-job: given everything committed and everything still to come, where will this job land?

The four numbers a live job needs

Costs to date — actuals, coded to the job and to cost categories, kept current (days behind, not weeks).
Committed costs — purchase orders and subcontractor commitments that haven’t been invoiced yet. Leaving these out is the single biggest cause of a job looking healthier than it is.
Cost to complete — the site’s honest estimate of what’s left, revised as the job moves. This is judgement, not arithmetic, and it’s where the project manager and the numbers have to meet.
Forecast final cost and margin — costs to date plus committed plus cost to complete, against the contract value. That’s the number the board, and the bank, actually want.

Work in progress and progress claims

The other half of the picture is revenue timing. Work in progress — work done but not yet claimed — and over- or under-claiming against progress are what make a profitable builder run out of cash. A job can be on margin and still drain the bank because claims lag the work or retentions tie up the surplus. A lender reads WIP and claim discipline as a proxy for how well you control cash, so it belongs in your reporting, not just your head.

Retentions and the cash you can’t see

Retentions held against your claims, and retentions you hold from subbies, distort both profit and cash. Tracking them by job — what’s held, by whom, and when it’s due for release — turns a vague “money owed eventually” into a forecastable cash inflow. It also stops the common mistake of celebrating a job’s profit while 5% of it sits unreleased for another year.

What the bank actually wants to see

When you ask a lender to extend a facility, they are underwriting your ability to finish your current jobs without a cash shock. The reporting that earns a yes is consistent and forward-looking:

A work-in-hand schedule — contracted work, forecast cost, forecast margin, by job.
Cash flow tied to the claim schedule, not to wishful timing.
Covenant tracking — the ratios your facility requires, projected forward, so a breach is seen before it happens.
Evidence that the numbers are current and consistent month to month — lenders trust a steady, modest reporter over an optimistic one who revises every quarter.

Getting there

You don’t need enterprise software to do this well. You need three disciplines: code costs to jobs and categories consistently, capture committed costs as they’re ordered (not when invoiced), and sit down monthly to revise cost-to-complete with the people who actually know. Layer a simple work-in-hand and covenant view on top, and you have job costing the board can run the business on and the bank can lend against.

The builders who win bigger facilities and sleep better aren’t the ones with the lowest costs. They’re the ones who can show, on any given week, exactly where every job will land — and prove it.

Job costing that bank managers trust