Ask a random group of budding property developers what percentage profit they should make on a project, and there's a good chance they will say 20%.
It's a number that gets thrown around so often it has become part of property development folklore. People may not know whether it means profit on cost, profit on value, margin, return on equity, or something they heard from a bloke at a barbecue, but 20% it is.
And to be fair, 20% profit on cost is a useful benchmark. It gives a project some breathing room. It helps cover risk. It gives the developer a reason to put up with councils, consultants, builders, lenders, neighbours, weather delays, cost increases, and the general emotional rollercoaster of trying to manufacture real estate.
But the real question is not just whether you can make 20%.
The real question is: what do you do with it?
Most people think about development profit as cash. You buy or control a site, complete the project, sell the finished product, make a profit, and move on. That is certainly one way to play the game. But there is another way to look at it. Rather than simply making profit, what if you used development to manufacture ownership?
That is where the “magic number of six” comes in.
Starting With The Basics
Let’s start with a simple duplex.
You buy a site, build two dwellings, sell one, and keep one. On paper, that sounds fantastic. You have completed a development, sold one property, and retained one brand-new asset. Cue the motivational music. Maybe even a LinkedIn post with the words “grateful”, “journey”, and “resilience” in it.
But then the bank turns up with a spreadsheet and ruins the mood.
If your project makes around 20% profit on cost, selling one dwelling effectively manufactures the deposit on the one you keep. That is a great outcome in one sense. You have created equity rather than saving it dollar by dollar.
But the problem is that you may still have a large chunk of debt attached to the retained property. In simple terms:
You may have manufactured a 20% deposit.
You may still have 80% debt.
The property may be brand new and lovely.
The cash flow may still be ugly.
And in the current interest rate environment, ugly cash flow is not something most people are looking to collect as a hobby.
Because if the property is negatively geared, that means the asset you were hoping would help you build wealth can actually start draining your cash flow. It may also hurt your borrowing capacity, making it harder to move into the next deal.
So while you technically own an asset, you may have also accidentally built yourself a very expensive handbrake.
This is where a lot of developers and investors get stuck. The temptation to keep an asset too early can actually slow you down. You have created value, but your capital is trapped. You have equity on paper, but not enough income. You have an asset, but you may not have the serviceability to keep moving.
The issue is not that keeping stock is bad. Keeping stock can be excellent. The issue is timing.
Selling, on the other hand, gives you cash. Yes, you may need to pay tax. Yes, it can feel painful to let go of a good asset. But realised cash gives you options. It allows you to pay down debt, strengthen your position, and step into the next deal. And ideally, that next deal should not be a completely different strategy. It should be a larger version of the same strategy.
This is an important point. One of the biggest mistakes newer developers make is jumping from one strategy to another.
What you generally do not want to do is this:
Project one: duplex
Project two: commercial conversion
Project three: land subdivision in another state
Project four: childcare centre
Project five: luxury Airbnb retreat with llamas (they spit)
That is not a strategy. That is a property identity crisis.
Every strategy has its own rules, risks, consultants, feasibility assumptions, finance requirements, planning pathways, build challenges, and exit strategies. Jumping from one thing to another means you are constantly starting again.
The smarter path is to learn one model deeply, then scale it.
If you start with a duplex, the next logical step may be a four-pack. If you start with a simple subdivision, the next step may be a larger subdivision. The aim is not to reinvent yourself on every project. The aim is to take what you have already learned and apply it at a slightly larger scale.
Scaling to 4
Now let’s look at what happens when you move from two to four.
If you sell three and keep one, the retained property is likely to be in a better position than the retained dwelling in the duplex example. Why? Because the profit from three sales gives you more ability to pay down debt on the one you keep.
At this point, the numbers start to look better. The retained property may still have some debt against it, but the debt position is likely to be lower than it was in the duplex example. The property may be closer to neutral cash flow, or even positively geared, depending on the rent, debt level, interest rate, and other holding costs. That is progress.
That is progress.
But it may still not be the full dream outcome. Your capital may still be partly trapped. You may still have debt. The property may still not be producing the kind of income that makes you want to dance around the kitchen.
Scaling to 6
This is where the magic happens.
Imagine you complete a six-dwelling development. You sell five and keep one.
If each dwelling effectively contributes 20% profit on cost, then selling five dwellings can create enough profit to pay for the sixth one. In simple terms, five lots of 20% equals 100%.
That means the profit from the five sold properties has the potential to clear the debt attached to the one you retain.
This is why six can be such a powerful number.
Let’s put some simple numbers around it. Assume you are developing six properties, and each property is worth $1 million on completion. That gives you a total project revenue of $6 million. If the project achieves a 20% profit on cost, that means the profit is $1.2 million, and the total development cost is $4.8 million.
Now imagine you sell five of those properties for $1 million each. That gives you $5 million in sales revenue. That $5 million is enough to pay off the $4.8 million total development cost, leaving $200,000 before tax, costs, and any final adjustments. More importantly, you still own one completed property worth $1 million.
In that simplified scenario, you have sold five, cleared the project debt, and retained one property outright.
Let's recap the different scenarios, based on 20% profit on costs.
At two, you manufacture a deposit
At four, you manufacture a much stronger equity position
At six, you manufacture a debt-free asset
And a debt-free asset is a very different beast from a heavily geared one.
Of course, in the real world, the numbers will not be that clean. There will be tax. There will be selling costs. There may be GST, finance costs, contingency overruns, delays, and other project-specific variables. Not every project will hit 20%. Not every market will support the required end values. Not every developer will be able to jump from two to four to six without building the necessary skills, team, capital base, and confidence.
This Principle is Powerful
The principle is that development can be used not just to create cash profit, but to manufacture long-term ownership. Instead of buying established properties one at a time and waiting decades for equity to build, you are using the development process to create equity more deliberately. You are using the profit from the project to buy down debt. You are turning short-term development activity into long-term passive income.
And importantly, you do not start at six.
You learn six by first learning four. You learn four by first learning two. You build capability in stages. The early projects teach you the fundamentals: site selection, feasibility, finance, consultants, planning, construction, sales, cash flow, risk management, and timing. Each project gives you more experience, more confidence, and ideally more capital to work with.
This is why scalable strategy matters so much. A duplex can be a stepping stone. A four-pack can be a stepping stone. A six-pack can be the point where the strategy starts producing retained stock that is genuinely worth holding.
The magic is not really in the number six itself. The magic is in understanding the relationship between scale, profit, debt reduction, and retained ownership.
If you keep too early, you may trap yourself. If you sell everything forever, you may make cash but never build a passive income base. But if you scale strategically, selling enough stock to clear debt while retaining one income-producing asset, you can begin to build a portfolio of properties that are owned outright or close to it.
Repeat that process several times, and the long-term outcome can be significant. One debt-free property may provide useful income. Several debt-free properties can start to create genuine financial freedom.
That is the bigger picture.
Not just one profitable deal.
Not just a nice spreadsheet.
Not just a photo of the finished development on social media with a caption about “lessons learned”.
The goal is to turn development profit into long-term wealth.
Now, before anyone runs off and buys a six-unit site after reading this, let’s add the obvious but necessary warning.
Six may be magic, but it is not beginner magic.
You do not start with six just because the maths looks attractive. Bigger projects also mean bigger risks, bigger finance requirements, bigger holding costs, bigger planning complexity, bigger construction contracts, and bigger consequences if something goes wrong.
You learn six by first learning four. You learn four by first learning two.
Property development is often seen as risky, complicated, and cash-hungry. And yes, it can be all of those things. But when done well, with the right strategy, the right numbers, and the discipline to scale in a controlled way, it can also be a powerful way to manufacture wealth.
The key is not simply chasing the biggest possible project. It is not jumping into six dwellings before you understand two. It is not keeping assets before you can afford to hold them. And it is not assuming that 20% profit automatically makes every decision a good one.
The key is understanding how each project supports the next.
Start with a strategy that can scale. Learn the numbers. Realise profit when you need to. Avoid trapping your capital too early. Build your skills project by project. Then, when the time is right, use the magic number of six to turn development profit into long-term ownership.
Because the real goal is not just to make money on a deal.
The real goal is to use each deal to move closer to owning income-producing assets that can support you for years to come.
It's a number that gets thrown around so often it has become part of property development folklore. People may not know whether it means profit on cost, profit on value, margin, return on equity, or something they heard from a bloke at a barbecue, but 20% it is.
And to be fair, 20% profit on cost is a useful benchmark. It gives a project some breathing room. It helps cover risk. It gives the developer a reason to put up with councils, consultants, builders, lenders, neighbours, weather delays, cost increases, and the general emotional rollercoaster of trying to manufacture real estate.
But the real question is not just whether you can make 20%.
The real question is: what do you do with it?
Most people think about development profit as cash. You buy or control a site, complete the project, sell the finished product, make a profit, and move on. That is certainly one way to play the game. But there is another way to look at it. Rather than simply making profit, what if you used development to manufacture ownership?
That is where the “magic number of six” comes in.
Starting With The Basics
Let’s start with a simple duplex.
You buy a site, build two dwellings, sell one, and keep one. On paper, that sounds fantastic. You have completed a development, sold one property, and retained one brand-new asset. Cue the motivational music. Maybe even a LinkedIn post with the words “grateful”, “journey”, and “resilience” in it.
But then the bank turns up with a spreadsheet and ruins the mood.
If your project makes around 20% profit on cost, selling one dwelling effectively manufactures the deposit on the one you keep. That is a great outcome in one sense. You have created equity rather than saving it dollar by dollar.
But the problem is that you may still have a large chunk of debt attached to the retained property. In simple terms:
You may have manufactured a 20% deposit.
You may still have 80% debt.
The property may be brand new and lovely.
The cash flow may still be ugly.
And in the current interest rate environment, ugly cash flow is not something most people are looking to collect as a hobby.
Because if the property is negatively geared, that means the asset you were hoping would help you build wealth can actually start draining your cash flow. It may also hurt your borrowing capacity, making it harder to move into the next deal.
So while you technically own an asset, you may have also accidentally built yourself a very expensive handbrake.
This is where a lot of developers and investors get stuck. The temptation to keep an asset too early can actually slow you down. You have created value, but your capital is trapped. You have equity on paper, but not enough income. You have an asset, but you may not have the serviceability to keep moving.
The issue is not that keeping stock is bad. Keeping stock can be excellent. The issue is timing.
Selling, on the other hand, gives you cash. Yes, you may need to pay tax. Yes, it can feel painful to let go of a good asset. But realised cash gives you options. It allows you to pay down debt, strengthen your position, and step into the next deal. And ideally, that next deal should not be a completely different strategy. It should be a larger version of the same strategy.
This is an important point. One of the biggest mistakes newer developers make is jumping from one strategy to another.
What you generally do not want to do is this:
Project one: duplex
Project two: commercial conversion
Project three: land subdivision in another state
Project four: childcare centre
Project five: luxury Airbnb retreat with llamas (they spit)
That is not a strategy. That is a property identity crisis.
Every strategy has its own rules, risks, consultants, feasibility assumptions, finance requirements, planning pathways, build challenges, and exit strategies. Jumping from one thing to another means you are constantly starting again.
The smarter path is to learn one model deeply, then scale it.
If you start with a duplex, the next logical step may be a four-pack. If you start with a simple subdivision, the next step may be a larger subdivision. The aim is not to reinvent yourself on every project. The aim is to take what you have already learned and apply it at a slightly larger scale.
Scaling to 4
Now let’s look at what happens when you move from two to four.
If you sell three and keep one, the retained property is likely to be in a better position than the retained dwelling in the duplex example. Why? Because the profit from three sales gives you more ability to pay down debt on the one you keep.
At this point, the numbers start to look better. The retained property may still have some debt against it, but the debt position is likely to be lower than it was in the duplex example. The property may be closer to neutral cash flow, or even positively geared, depending on the rent, debt level, interest rate, and other holding costs. That is progress.
That is progress.
But it may still not be the full dream outcome. Your capital may still be partly trapped. You may still have debt. The property may still not be producing the kind of income that makes you want to dance around the kitchen.
Scaling to 6
This is where the magic happens.
Imagine you complete a six-dwelling development. You sell five and keep one.
If each dwelling effectively contributes 20% profit on cost, then selling five dwellings can create enough profit to pay for the sixth one. In simple terms, five lots of 20% equals 100%.
That means the profit from the five sold properties has the potential to clear the debt attached to the one you retain.
This is why six can be such a powerful number.
Let’s put some simple numbers around it. Assume you are developing six properties, and each property is worth $1 million on completion. That gives you a total project revenue of $6 million. If the project achieves a 20% profit on cost, that means the profit is $1.2 million, and the total development cost is $4.8 million.
Now imagine you sell five of those properties for $1 million each. That gives you $5 million in sales revenue. That $5 million is enough to pay off the $4.8 million total development cost, leaving $200,000 before tax, costs, and any final adjustments. More importantly, you still own one completed property worth $1 million.
In that simplified scenario, you have sold five, cleared the project debt, and retained one property outright.
Let's recap the different scenarios, based on 20% profit on costs.
At two, you manufacture a deposit
At four, you manufacture a much stronger equity position
At six, you manufacture a debt-free asset
And a debt-free asset is a very different beast from a heavily geared one.
Of course, in the real world, the numbers will not be that clean. There will be tax. There will be selling costs. There may be GST, finance costs, contingency overruns, delays, and other project-specific variables. Not every project will hit 20%. Not every market will support the required end values. Not every developer will be able to jump from two to four to six without building the necessary skills, team, capital base, and confidence.
This Principle is Powerful
The principle is that development can be used not just to create cash profit, but to manufacture long-term ownership. Instead of buying established properties one at a time and waiting decades for equity to build, you are using the development process to create equity more deliberately. You are using the profit from the project to buy down debt. You are turning short-term development activity into long-term passive income.
And importantly, you do not start at six.
You learn six by first learning four. You learn four by first learning two. You build capability in stages. The early projects teach you the fundamentals: site selection, feasibility, finance, consultants, planning, construction, sales, cash flow, risk management, and timing. Each project gives you more experience, more confidence, and ideally more capital to work with.
This is why scalable strategy matters so much. A duplex can be a stepping stone. A four-pack can be a stepping stone. A six-pack can be the point where the strategy starts producing retained stock that is genuinely worth holding.
The magic is not really in the number six itself. The magic is in understanding the relationship between scale, profit, debt reduction, and retained ownership.
If you keep too early, you may trap yourself. If you sell everything forever, you may make cash but never build a passive income base. But if you scale strategically, selling enough stock to clear debt while retaining one income-producing asset, you can begin to build a portfolio of properties that are owned outright or close to it.
Repeat that process several times, and the long-term outcome can be significant. One debt-free property may provide useful income. Several debt-free properties can start to create genuine financial freedom.
That is the bigger picture.
Not just one profitable deal.
Not just a nice spreadsheet.
Not just a photo of the finished development on social media with a caption about “lessons learned”.
The goal is to turn development profit into long-term wealth.
Now, before anyone runs off and buys a six-unit site after reading this, let’s add the obvious but necessary warning.
Six may be magic, but it is not beginner magic.
You do not start with six just because the maths looks attractive. Bigger projects also mean bigger risks, bigger finance requirements, bigger holding costs, bigger planning complexity, bigger construction contracts, and bigger consequences if something goes wrong.
You learn six by first learning four. You learn four by first learning two.
Property development is often seen as risky, complicated, and cash-hungry. And yes, it can be all of those things. But when done well, with the right strategy, the right numbers, and the discipline to scale in a controlled way, it can also be a powerful way to manufacture wealth.
The key is not simply chasing the biggest possible project. It is not jumping into six dwellings before you understand two. It is not keeping assets before you can afford to hold them. And it is not assuming that 20% profit automatically makes every decision a good one.
The key is understanding how each project supports the next.
Start with a strategy that can scale. Learn the numbers. Realise profit when you need to. Avoid trapping your capital too early. Build your skills project by project. Then, when the time is right, use the magic number of six to turn development profit into long-term ownership.
Because the real goal is not just to make money on a deal.
The real goal is to use each deal to move closer to owning income-producing assets that can support you for years to come.
