How to Price a Custom Home Build (So You Actually Make Margin)

I have sat across the desk from a lot of builders who were flat out, fully booked for 8 months, and still couldn't tell me whether the job they were standing on was making money. They were busy. They were respected. And they were broke at the end of the quarter. Almost every time, the problem started at the price.

Pricing a custom home build is not the same as pricing a project home or a renovation off a menu. Every site is different. Every client wants something the last one didn't. Every quote is a one-off estimate of work that hasn't happened yet, full of allowances, provisional sums and assumptions that the weather, the soil, and the client's mind can all blow apart. If your price doesn't account for that uncertainty, you are not pricing a build. You are gambling with your own money.

This is the page I point builders to when they say "I think my pricing is off but I don't know where." It walks the whole thing end to end, and each part links out to a deeper guide.

Price is not one number, it is a stack

The single biggest mistake I see is treating the price as one figure you pluck out and stick a percentage on. A real price is a stack, and every layer has to be right or the whole thing leans.

The layers, bottom to top:

• Direct costs: materials, subbies, plant hire, the labour that physically touches the job.
• Site costs: the stuff that is specific to this block. Access, fall, rock, scaffold, traffic management, temporary fencing, the long run for services.
• Preliminaries: site sheds, insurances, supervision, your time on site that nobody invoices for.
• Overheads: the cost of your business existing at all. Your ute, your office, your phone, your software, your bookkeeper, your own wage.
• Margin: what is left for the business to grow, to carry a bad month, and to reward the risk you are carrying.

Most builders nail the first layer and guess the rest. They get sharp quotes from their subbies, add them up, and slap 15 or 20 percent on top, calling that 20 percent both their overhead and their profit. It is not. Your overhead is a real number you can calculate, and your margin has to sit on top of it, not share the same slice.

You cannot price what you have not costed

Before you can put a margin on anything, you need to know what an hour of your own time actually costs to put on the ground. That is your charge-out rate, and almost no builder I meet has worked it out properly. They charge what the bloke down the road charges, or what they charged 3 years ago, and they wonder why the bank balance never moves.

Your charge-out rate has to cover your wage, super, leave you actually take, sick days, public holidays, workers comp, tool replacement, vehicle, insurances, and a share of every overhead the business carries, all spread across the productive hours you can genuinely bill in a year (not the 2,080 the calendar says, because nobody bills every hour). When you run that maths, the number is almost always higher than what you have been charging. Working out your charge-out rate as a builder is the foundation under every quote you write, and it is the first thing I fix with most clients.

The Charge-Out Calculator at the bottom of this page does that maths for you. Punch in your target wage and your real hours, and it spits out the rate you should be charging. Most builders get a shock the first time they see it.

The contract type changes who carries the risk

How you price is tied to how you contract. A fixed-price contract puts the risk of getting the estimate wrong squarely on you. A cost-plus contract shifts a lot of that risk onto the client, but it asks them to trust you and it asks you to keep clean, defensible records. Neither is automatically better. The right call depends on the job, the client, and how much of the design is actually locked when you sign.

Get this wrong and you can do everything else right and still lose. I have watched builders sign a fixed-price contract on a job where half the scope was still "to be confirmed," then wear every surprise out of their own margin for 9 months. The full breakdown of fixed-price vs cost-plus contracts covers which one protects your margin in which situation, and how to use provisional sums and allowances so you are not the one bleeding when the unknowns turn up.

Quick word here: I am an advisor, not your lawyer. The contract framing on this site is about protecting your commercial position. Get the actual contract wording checked by someone licensed before you sign anything.

How much margin is the right amount

Once your costs are honest and your contract is sensible, you have to decide what margin to carry. "Whatever the market will bear" is not a strategy, and "the same percentage I always use" usually means a number someone invented a decade ago.

Margin is not greed. It is the buffer that lets you survive a job that goes pear-shaped, the fuel that lets you hire and grow, and the reward for carrying every risk on the site. Too thin and one bad job wipes out the profit on the three good ones. The honest answer to how much margin a custom builder should make is more than most builders run, and the post explains how to set a number you can actually defend to a client without flinching.

Quoting is where good pricing goes to die

You can have your costs right, your rate right, and your margin set, and still hand the client a quote that loses you money. Quoting a custom build is its own skill. It is the difference between a number that looks competitive on the day and a number that still holds up when you are 6 weeks in and the client has changed the kitchen for the third time.

The traps are everywhere: rushing the take-off, copying allowances from a job that was nothing like this one, leaving prelims off because you forgot they existed, and that quiet pressure to shave the number so you win the job. The guide on how to quote a custom build without underquoting walks through a sequence that catches the things you would otherwise miss, and a way to present the price so the client sees value instead of just a big figure.

When quotes keep coming in short, it is rarely one big mistake. It is a slow leak: a forgotten cost here, an optimistic allowance there, a variation you never charged for. If your jobs keep finishing thinner than they quoted, the post on why your quotes keep losing money helps you find the exact leak, because once you can see it, you can plug it.

Variations are not admin, they are profit

Here is where I see good builders give away thousands without noticing. The client asks for a change. It is small. You are mid-job, you are flat out, you do it on a handshake and tell yourself you will sort the paperwork later. You never do. Multiply that across a build and you have handed back a chunk of your margin for free, plus the labour and the time you swallowed.

Variations are one of the few places on a custom build where the profit is sitting there for the taking, and most builders leave it on the table because chasing the paperwork feels awkward. It does not have to. A clean variation process, agreed up front in the contract and run the same way every time, turns awkward conversations into a normal part of the job. The guide on managing build variations shows you how to price them, document them, and get them signed before the work happens, so they add to your margin instead of eating it.

How it all fits together

Good pricing is not a spreadsheet trick. It is a chain:

• Know what your time really costs (charge-out rate).
• Choose a contract that puts the risk in the right place.
• Set a margin that survives a bad job.
• Quote in a sequence that catches what you would otherwise miss.
• Charge for every variation, every time.

Break any one link and the job underpays you no matter how hard you work. Get all five right and the same builds you are already winning start paying you what they should.

This is also where pricing and cash meet. A profitable job on paper can still leave you short if the money lands at the wrong time, which is why pricing and cash flow are two sides of the same coin. Price right and your cash flow has a fighting chance. Price wrong and no payment schedule in the world will save you.

If you only do one thing after reading this, grab the Charge-Out Calculator below and work out your real rate. It is free, it takes a few minutes, and it is the number every other decision hangs off. And if you want a second set of eyes on your actual quotes and margins, the free numbers check is exactly that: I sit down with your real figures and we find where the money is leaking before it costs you another job.