Cash Flow for Custom Builders: the Numbers That Keep You Solvent

I have watched profitable builders go broke. Not bad builders. Good ones, with full order books and happy clients and a reputation that brought the next job in the door. They went under because they ran out of cash, and running out of cash and making a loss are two completely different problems.

This is the part of the business nobody teaches you on the tools. You learn to frame, to set out, to manage a slab pour in 38 degree heat. Nobody sits you down and explains that a build can be making margin on the spreadsheet and still drain your bank account dry by lock-up. So let me walk you through the numbers that actually keep a custom home builder solvent, and how they connect.

Profit is an opinion, cash is a fact

Here is the line I repeat to every builder I sit with. Profit is an opinion. Cash is a fact.

Profit is what your accountant calculates at the end of the year after they have made a pile of assumptions about work in progress, retentions you might never see, and variations you have not been paid for yet. Cash is what is in the account right now when the plumber hands you an invoice with 7 day terms.

You can be profitable and insolvent at the same time. It happens constantly in residential building because of the way money moves through a job. You pay your subbies and suppliers as the work happens, week by week. But you only get paid by the client at set milestones, often weeks after you have already shelled out for the materials and labour that got you to that milestone. That gap is where builders drown.

The cash gap, and why building is brutal for it

Think about a typical fixed-price build. You pour the slab. To get there you have paid for the excavation, the pier holes, the steel, the concrete, the pump, the slab gang. That is real money out of your account this week.

Then you lodge your slab-stage progress claim and wait. Even on good terms you might wait 7 to 14 days for that draw to clear. Meanwhile the frame timber has turned up and the supplier wants paying, and the chippies are already up working.

So at any given moment on a build you are funding the difference between what you have spent and what you have been paid. On a $600,000 build that difference can easily sit at $40,000 to $80,000 of your own money tied up in someone else's house. Run 3 of those jobs at once and you can be carrying a quarter of a million dollars of other people's homes on your own back. That is the cash gap, and it is why a builder with a great year on paper can still be sweating every Friday.

The single biggest lever you have over that gap is your draw schedule. Front-load your claims so the client's money arrives before you spend it, not after. I go deep on exactly how to structure that in progress claims and draw schedules, because it is the difference between funding the job with the client's money or with yours.

The numbers that actually matter

You do not need an accounting degree and you do not need to turn into a numbers nerd. You need to know a small handful of figures cold. Here they are.

Your breakeven. This is the amount of revenue you must turn over just to cover your fixed overheads before you make a single dollar of profit. Rent on the yard, your ute and the truck, insurances, your admin person, software, your own minimum wage. If you do not know this number you are flying a plane with no fuel gauge. I have written a full walkthrough on breakeven for builders because it is the number everything else hangs off.

Your gross margin per job. What is left after the direct costs of a specific build (materials, labour, subbies, site costs) but before your overheads. If you do not know your margin on each job, you cannot tell which jobs are carrying the business and which are quietly bleeding it. Some of your busiest jobs are your worst ones, and you will not know until you learn to spot an unprofitable job before you sign the contract.

Your cash position, this week and 8 weeks out. Not the year-end picture. Right now, and where it is heading. A simple rolling forecast of money in and money out, week by week, so you can see the Friday where you come up short while there is still time to do something about it.

Your own wage. If the business cannot pay you a proper, consistent wage, it is not a business, it is a job that owns you. Most builders pay themselves last and pay themselves whatever is left, which is often nothing. That is backwards. I cover how to fix it in how to pay yourself a proper wage.

If reading a profit and loss or a balance sheet makes your eyes glaze over, start with my plain-English guide on how to read your building business numbers. It is written for builders, not bookkeepers.

Getting paid is half the battle

You can have perfect pricing and a tidy draw schedule and still go backwards if your money turns up late or not at all. Deposits, progress claims, retentions and security of payment all decide whether the cash actually lands in your account on time.

A retention of 5 percent held until the end of the defects period is, in effect, the client holding a chunk of your profit hostage for 12 months. Slow payers stretch your cash gap wider every week they delay. The builders who stay solvent are ruthless about the mechanics of getting paid, and there is a right way to handle getting paid on time that keeps you on the front foot without souring the client relationship.

I am an advisor, not your accountant or your lawyer, so the specifics of your contract terms and any security of payment claim should be confirmed with your own licensed professional. But the principle does not change: money owed to you is not money in the bank, and you should manage it like it could vanish.

How it all fits together

Here is the sequence, in plain terms.

You price the job so it carries a real margin once every cost and your own wage are in (that starts with pricing your builds properly). You structure the draw schedule so the client funds the work, not you. You track your margin job by job so the dud ones get caught early. You keep a rolling eye on cash so no Friday catches you out. And you pay yourself a proper wage off the top, not the scraps off the bottom.

Do those things and the feast-or-famine sweats settle down. You stop using one job's deposit to plug last job's hole. You stop the 11pm bank-balance panic. The business starts behaving like a business.

None of it requires you to become an accountant. It requires you to know your numbers and act on them while there is still time. That is the whole game.

The fastest place to start is your charge-out rate, because almost every cash problem I see traces back to a builder charging an hourly rate that never actually covered their real costs. Grab the free Charge-Out Calculator, plug in your target wage and your overheads, and it will show you the rate you genuinely need to charge to stay solvent. If you want a second set of eyes on the full picture, the free numbers check is exactly that: we sit down with your real figures and find where the cash is leaking.