Know your margin before the job is done: costing a build as you go

Ask a lot of builders how a finished job did and you will get a shrug and a rough guess. The invoices went out, money came in, the merchant got paid — and somewhere in the middle is a margin nobody actually measured. On a good job that is a missed lesson. On a bad one it is a nasty surprise you only spot when the numbers finally settle, weeks after the last person left site.

The problem is not effort. It is timing. If you only add up costs at the end, the margin is already whatever it is — you cannot un-spend on that skip you forgot to price, or the extra two days of labour nobody flagged. The builders who protect their profit do the same sums while the job is still running, when there is still time to react.

Cost is not the same as price

A quote captures your price — what the client pays. Your margin is the gap between that price and what the job actually costs you. Two builders can win the same job at the same price and one makes money while the other barely breaks even, purely because one tracked cost and the other didn't.

So the number that matters day to day isn't the invoice total. It's cost-to-date against your contract value — labour, materials, plant, and subbies as they land, set against the price you agreed. That single comparison tells you whether the job is where it should be.

Log costs as they happen, not at the end

The habit that changes everything is capturing each cost when it occurs, not reconstructing it later from a carrier bag of receipts. A materials run, a subbie's invoice, a day of plant hire — logged the moment it happens, ideally with a photo of the receipt so nothing gets lost. It takes seconds on site and saves an evening of guesswork at the end.

Do that and your margin stops being a mystery. At any point in the job you can see what you've spent, what you've got left against the contract, and whether the trend is healthy or heading the wrong way.

Catch the drift early

Jobs rarely blow up in one go. They drift — a bit more labour here, a materials price that crept up there, a variation that was done as a favour and never charged. Watched weekly, that drift is obvious and fixable: you have the conversation about the extra socket run as a variation before you have paid for the cable, not after. Watched only at the end, the same drift is just a smaller number in your pocket.

Keep it to yourself

Your cost and margin are your business, not the client's. The price you agreed is what they see; what it costs you to deliver it stays firmly on your side of the table. Good tools keep that separation automatic, so you can be completely open with a client about progress and payments while your margin stays private to you and your team.

Getting started

Cost and margin tracking is built into Builders Ready — you log costs against the job as you go, and it works out your live margin against the contract value, visible only to you and your team. It sits right next to the same timeline your client follows, so the job stays transparent to them and profitable for you. You can try it free for 14 days on your next job and finally know your margin before the last brick is laid.