Construction Loans for Building a New Home

A section, a fixed-price building contract and a dream home can look straightforward on paper. Funding the build is where the detail matters. Construction loans are designed for this job, but they work differently from a standard home loan - and getting the structure right before you sign can save real stress later.

Rather than receiving the full loan amount at settlement, your lender generally releases funds in agreed stages as work is completed. That means your finance needs to account for the land, the build contract, the timing of each payment and a sensible buffer for costs that sit outside the contract.

How construction loans work

Most construction lending begins with the lender assessing the value of the finished home, not just the land you are buying. They will look at your section, plans, specifications, building contract, income, deposit and existing commitments to decide what they can lend.

Once approved, the loan is usually paid out through progress payments, often called drawdowns. Your builder will invoice at key milestones, such as laying foundations, completing the framing, enclosing the home and reaching practical completion. The lender reviews the request and releases the relevant funds, usually directly to the builder.

During the build, you normally pay interest only on the amount that has actually been drawn down. This can make the early stages more manageable than making repayments on the full loan from day one. Once the build is complete, the lending commonly moves to principal and interest repayments, although the right repayment plan depends on your wider circumstances.

The process is controlled for good reason. Your lender wants confidence that the house is being built as agreed and that the completed property will support the lending. You want the same certainty, particularly when a large part of your budget is committed before you can move in.

The two common ways to finance a build

A land-and-build purchase is the traditional construction loan scenario. You buy a section, then engage a builder under a building contract. The land may settle first, with the construction funding drawn down later as work begins. This approach can offer more choice over design, location and builder, but it also requires careful coordination between the sale and purchase agreement, contract and finance approval.

A turnkey purchase works differently. You agree to buy a completed new home from a developer or builder, usually paying a deposit upfront and the balance when the property is finished. Because there are no progress payments for you to manage, it can feel simpler. However, you still need to understand completion dates, sunset clauses, what is included in the specifications and whether your lending approval will remain suitable if the build is delayed.

Neither option is automatically better. A turnkey may suit buyers who want clearer upfront payments and less involvement during construction. A land-and-build project can suit people who value control and are prepared to make more decisions along the way.

Your deposit and the finished value

Your deposit is a key part of any construction loan application. The required amount varies between lenders and depends on factors including your income, the property type, location, build contract and whether you are an owner-occupier or investor.

For a land-and-build purchase, lenders may look at the total project cost: the land, build price and any eligible related costs. They will also assess the registered valuation of the completed home. If the final valuation comes in lower than expected, your available lending may be lower too, leaving a gap you need to cover.

This is why it is risky to assume that every dollar in your budget will be financed. Site works, landscaping, driveways, fencing, appliances, window coverings and upgrades can be excluded from a base building contract or treated differently by lenders. The glossy showhome may include features that are not in your chosen specification.

Before committing, separate the fixed contract price from every other expected cost. A realistic plan includes legal fees, valuation costs, council-related charges, insurance, moving expenses and a contingency for surprises. Building projects can change, even with excellent preparation.

What lenders want to see

A clean, complete application gives your construction loan the best chance of moving quickly. Lender requirements differ, but the usual documents include evidence of income, bank statements, identification, details of debts and savings, and the sale and purchase agreement for the land or property.

For the build itself, expect to provide building plans, specifications, a signed fixed-price contract, building consent information where available, insurance details and a schedule of progress payments. Lenders will also want to see that your builder is suitably experienced and that the contract has appropriate protections.

If you are self-employed, contracting or earning income through a business, preparation matters even more. Financial statements, tax returns, management accounts and an explanation of how your income is generated can help present a clear lending picture. A good application is not just about meeting a policy checkbox - it helps the lender understand the strength and sustainability of your position.

Fixed-price contracts and cost overruns

A fixed-price contract is often preferred because it creates more certainty around the build cost. But “fixed price” does not always mean every possible expense is locked in. Provisional sums, allowances, variations, earthworks and service connections deserve close attention.

For example, a contract might allow an estimated amount for excavation. If difficult ground conditions are found, the final cost could exceed that allowance. Changes you make after signing - from a different kitchen layout to upgraded cladding - can also become variations that need extra funding.

Do not rely on the lender automatically covering variations. You may need cash savings, additional approved lending or a revised plan. Before signing, ask your builder what is included, what is excluded, which sums are provisional and how variations are approved. Getting that clarity early is far easier than finding a funding shortfall midway through the build.

Timing can affect your finance

Construction takes time, and delays are not unusual. Weather, materials, council processes, labour availability and changes to the scope can all affect the completion date. Your loan approval will have a validity period, so a delayed start or extended build may mean parts of your approval need to be refreshed.

Changes to your own situation matter too. Taking on a car loan, reducing work hours, changing jobs or using savings for unplanned costs can alter affordability. It is wise to avoid new debt and keep your finances stable from pre-approval through to completion wherever possible.

You also need insurance in place at the right stages. The builder may hold contract works insurance while the home is being built, but you should understand who is responsible and when your own cover begins. Your solicitor and adviser can help make sure this aligns with your contract and lending conditions.

Questions to ask before you sign

The right questions can uncover gaps before they become expensive. Ask how long your loan approval lasts, when interest starts being charged, how progress payments are released and whether inspections are required. Confirm the deposit required, the valuation assumptions and what happens if the finished value is lower than expected.

You should also ask your builder about the payment schedule, estimated completion date, inclusions, exclusions, allowances and variation process. If the builder requests a payment that does not match the lender-approved schedule, it may slow the drawdown. A contract and lending structure that line up from the start will usually make the build easier to manage.

Get the lending structure right before the build starts

Construction finance is not only about getting a yes from a lender. It is about choosing a loan structure that fits the way your project will actually unfold. That may mean allowing for interest-only payments during the build, retaining a cash buffer, splitting lending appropriately or selecting a lender with policies that suit your income and property plans.

An independent mortgage adviser can compare suitable lender options, explain the conditions in plain English and help prepare the information needed for a stronger application. At Mortgage Time, we work for you, not one bank, so the focus stays on finding a practical path to your new home.

A well-planned build should leave room for the unexpected, not leave you scrambling when it arrives. Start the lending conversation before you sign the land contract or building agreement, while you still have options and time to make confident decisions.

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