Quick answer
When a builder builds a spec home to sell, there's no client paying progress claims, so the builder funds the job until settlement. Lenders treat it as a small development: they look at land value, build cost, end value and how much of your own money is in. Your builder's margin usually isn't counted as cash equity, and in NSW you still need home building compensation cover on your own land.
Key points
- On a spec build, the builder carries the full cost until the home sells, instead of being paid by a client.
- Lenders assess a spec home like a development: land, build cost, end value, equity and exit.
- Your expected profit or builder's margin usually isn't treated as cash you've contributed.
- In NSW, spec builders developing residential property on their own land must buy home building compensation cover.
- Selling new homes brings GST and GST withholding at settlement into the numbers.
When a builder builds a spec home, there’s no client paying progress claims. You pay for the land, trades and materials until the house sells, so lenders treat it as a small development rather than a building job. They look at land value, build cost, likely sale price and your cash in. Your builder’s margin rarely counts as equity, and in NSW you still need warranty cover on your own block.
Plenty of good builders make the jump to spec work because the maths looks obvious: you already know what a house costs to build, so why not keep the developer’s profit as well? The building part is familiar. The finance is where it’s different, and where first-time spec builders get caught.
How is a spec home different from a contract build?
On a contract build the client pays you in stages. Their lender inspects and releases each progress payment, and your cash flow follows the claims. You carry some timing risk, but you’re never carrying the whole house.
On a spec build, you are the client. Nobody pays you anything until a buyer settles. Every week of construction, every subcontractor invoice and every load of materials comes out of your own pocket or a facility you’ve arranged.
| Contract build | Spec build | |
|---|---|---|
| Who funds construction | The client, through progress payments | You, through your own cash and a development-style loan |
| When you get paid | At each stage | At sale settlement |
| Market risk | The client’s | Yours |
| What the lender assesses | Your trading business | The project plus your business |
| Insurance | Warranty cover in the client’s favour | Still needed for the eventual buyer (NSW requires it on your own land) |
That shift explains almost everything a lender will ask.
How do lenders size a loan for a spec home?
Lenders approach a spec home the same way they’d approach a small developer’s townhouse project. Our page on construction and development finance goes deeper, but the core questions are:
- What’s the land worth today? Usually confirmed by a valuation.
- What will it cost to build? For a builder, that’s your own detailed budget, often reviewed by an independent quantity surveyor.
- What will it sell for? Based on recent sales of comparable new homes nearby.
- How much of your own money is in? Cash, or equity in other property.
- How will the loan be repaid? Sale, or a refinance if it doesn’t sell.
Expect to provide your licence, the plans and specifications, the itemised budget, the build program, your recent financials and a short list of comparable new-home sales. Builders who send that pack in one go, with the budget laid out the way a quantity surveyor would read it, tend to get faster answers than those who send a single-page estimate.
The lender funds the land and the build up to a limit, releases construction funds in stages as work is verified, and expects to be repaid from the sale.
Why doesn’t my builder’s margin count as equity?
This is the surprise for most builders. You might reason that a home worth $1.2m will cost you $750k to build and the land cost $350k, so there’s $100k of “built-in equity” from your margin and know-how.
Lenders see it differently. That $100k is a forecast profit, not money in the project. If the market softens, the build runs long or a sale falls over, that margin can shrink or disappear, and the lender’s only protection is the cash or security you put in at the start.
Some lenders do recognise that your build cost is lower than a project paying an outside builder, which can help the numbers. But almost all will still want a real contribution on top. Builders often fund that contribution with equity in their home or an investment property, or with property they already own through the business. A builder business loan secured on property is one way to do it without draining the cash the trading business needs.
What do spec builders forget about insurance and tax?
Warranty cover on your own land. In NSW, SIRA’s guidance says spec builders developing residential property on their own land must buy home building compensation cover. It protects the future buyer, and the buyer’s conveyancer will ask for it. Your eligibility limit with the insurer has to stretch to cover the spec job as well as your client work. Our guide to home warranty insurance and construction loans explains how lenders treat it.
GST on the sale. A builder selling new homes as part of their business should expect GST to apply to the sale. Most builders are registered already; if you’re not, business.gov.au says you must register for GST within 21 days of becoming aware your GST turnover will reach $75,000. On top of that, buyers of new residential premises generally withhold GST at settlement and pay it straight to the ATO. For a fully taxable sale that’s one-eleventh of the price, so your settlement cheque is smaller than the sale price.
Which entity owns the block. Building a spec home inside your trading company mixes the project with your client work. Many builders set up a separate company for each spec project; our guide to using an SPV for a development explains why.
Thinking about your first spec build and want to know how a lender would view it? Send us the basics; there’s no credit check to enquire.
Illustrative example: one spec home alongside a full order book
Illustrative only. A small residential builder with steady contract work buys a $420k block in an established suburb to build a single spec home. Their costed budget is $680k, and recent sales of similar new homes suggest about $1.25m.
The construction lender agrees to fund most of the land and the build in stages, but wants a cash contribution as well as the builder’s margin. The builder has $90k spare, but that’s the trading business’s buffer for wages and suppliers. Instead, they take a $200k second mortgage over their home for business purposes, use it as the project contribution and keep the trading cash untouched.
The build runs five weeks over because client jobs take priority during a wet month. The house sells a month after completion. After GST withholding, selling costs and repaying the construction lender, the second mortgage is cleared, with a thinner profit than the first spreadsheet promised. The builder now has a clear picture of what the next spec home will really take: GST and selling costs modelled from day one, five extra weeks of holding costs in the budget, and a contribution arranged before the block is even bought.
How do you keep a spec build from hurting the main business?
The biggest risk for a spec builder isn’t the spec home. It’s the effect on everything else. A few rules of thumb:
- Ring-fence the crew. Decide in advance how client jobs and the spec job share labour, and stick to it.
- Keep the money separate. A separate entity and bank account for the spec project make it easy to see what each side is costing.
- Hold a buffer that isn’t the trading buffer. Fund the contingency separately so a slow month in the business doesn’t stall the spec job.
- Price the holding time honestly. Every extra month on site adds interest, rates and insurance.
- Plan the exit, and a second exit. If the home doesn’t sell, will you rent it, refinance it into a residual stock loan, or sell below your target?
Lenders who see a builder thinking this way are much more comfortable funding the next project, and the one after that.
First spec home on the drawing board? Here’s the next step
If you’re a builder ready to keep the developer’s margin as well as the builder’s, the first finance question is usually how to fund your contribution without starving the business. Property-secured loans from $20k to $5m over residential or commercial property can do that for business purposes, and smaller working capital needs for the trading side can sometimes be met unsecured, typically from $5k to $500k.
The online enquiry is short (about 60 seconds) and doesn’t run a credit check at that first step. You’re not being added to a list that gets blasted to a pile of lenders. A real person who understands how builders work looks at your project and your business, then calls you. Please answer the questions accurately, especially land value, build budget and existing loans, so the first option we discuss actually suits the job.
Frequently asked questions
Can a builder get a construction loan for a spec home?
Yes. Many lenders will fund a licensed builder building to sell, especially one with a track record. They'll assess it as a small development, looking at the land, the build budget, the expected sale price, your contribution and how quickly similar homes sell in the area.
Does my builder's margin count as equity?
Usually not as cash. Lenders want real money or real security in first. Some will recognise that your build cost is lower because you're not paying another builder's margin, but they'll still want a cash or property contribution on top of the land and budget they fund.
Do I need home warranty cover if I'm building on my own land?
In NSW, official guidance says spec builders developing residential property on their own land must buy home building compensation cover. Rules differ in other states, so check with your state regulator. Buyers' conveyancers will usually ask for it when you sell.
Do I have to register for GST on a spec home?
If your business is building new homes to sell, GST will almost certainly be part of the picture. Business.gov.au says you must register within 21 days of becoming aware your GST turnover will reach $75,000. Most builders are already registered. Talk to your accountant about how the sale of a new home is taxed.
How do lenders view a spec builder's other jobs?
Closely. A spec home ties up cash and crew. Lenders want to know your client jobs are profitable and paying, so the spec project doesn't starve the main business, or the other way around.
What if the spec home doesn't sell quickly?
Plan for it before you start. Options include renting it while you wait for the market, refinancing into a residual stock loan or longer-term loan, or using other property as security to clear the construction lender. Lenders like to see that plan up front.