Understanding the Basics of Construction Loan Rates

Construction loan rates don't work like standard home loan rates because you're not borrowing a lump sum upfront.

You're charged interest only on the amount drawn down at each stage of your build, which means your costs increase progressively as the project advances. For self-employed company directors in Sydney, understanding how lenders calculate these rates and structure repayments makes the difference between a manageable build timeline and unexpected cash flow pressure halfway through construction.

How Construction Loan Interest Rates Are Calculated

Construction loan interest rates are typically higher than standard variable home loan rates because the lender is funding an incomplete asset.

Lenders price construction finance based on perceived risk. You're borrowing against future value rather than current property. During the build, the security is an incomplete structure on a block of land. Most lenders add a margin of 0.20% to 0.50% above their standard variable home loan rate. Some banks structure construction loans as interest-only repayment options during the build, then convert to principal and interest once construction completes and you transition to a construction to permanent loan.

Consider a company director building a custom home on suitable land in Kellyville. At current variable rates, a standard owner-occupied home loan might sit around 6.30%, while the construction phase could attract 6.60% to 6.80% depending on the lender, loan amount, and the director's financials. Once the property reaches practical completion and the loan converts to standard terms, the rate adjusts back to the lender's prevailing owner-occupied variable rate.

The Progressive Drawdown Structure and What It Means for Interest Costs

You only pay interest on funds released at each construction stage, not the full loan amount.

Under a progressive drawdown, the lender releases funds in instalments aligned with your progress payment schedule. A typical schedule includes five or six stages: base or slab, frame, lockup, fixing, and practical completion. Interest accrues only on the cumulative amount drawn. If your total loan amount is $800,000 but only $200,000 has been released after the slab stage, you're paying interest on $200,000, not the full amount.

This structure reduces your interest costs during construction compared to borrowing the full sum upfront. However, it requires careful coordination between your registered builder, the lender's progress inspection process, and your cash flow. Company directors often underestimate the timing lag between completing a stage, organising the progress inspection, and receiving funds. Budget for at least 7 to 10 business days between lodging a drawdown request and funds hitting your builder's account. Missing a progress payment deadline because of inspection delays can strain relationships with your builder and sub-contractors like plumbers and electricians.

Fixed Price Contracts vs Cost Plus and How They Affect Lending Terms

Lenders strongly prefer fixed price building contracts because they limit cost variation and protect the loan-to-value ratio.

A fixed price contract locks in the total build cost at the outset, giving the lender certainty that the loan amount will cover construction without requiring additional funds midway through. Most major banks will only approve construction finance if you're working with a registered builder under a fixed price building contract. The contract should clearly outline the progress payment schedule, typically structured around the stages mentioned earlier.

A cost plus contract, where the builder charges for materials and labour plus a margin, introduces uncertainty. Lenders view this as higher risk because the final cost isn't confirmed upfront. If you're building a custom design with a boutique builder who prefers cost plus, expect to provide a larger deposit or accept a lower loan-to-value ratio. Some lenders will cap the approved loan amount at 80% of the estimated project value under a cost plus arrangement, compared to 90% or 95% with a fixed price contract and a clear council approval and development application in place.

Progressive Drawing Fees and Other Cost Considerations

Most lenders charge a Progressive Drawing Fee or Progressive Payment Schedule fee for each stage inspection and fund release.

This fee typically ranges from $200 to $400 per drawdown, and with five or six drawdown stages, you're looking at $1,000 to $2,400 in fees across the build. Some lenders bundle this into a single upfront fee, while others charge per inspection. These costs sit outside your loan amount and need to be factored into your upfront budget alongside council plans, soil tests, and other pre-construction expenses.

For self-employed directors, the documentation process for construction finance is more intensive than a standard home loan. Lenders require two years of financials, tax returns, and often a detailed business activity statement. They'll also scrutinise your ability to service the loan while covering living expenses and any existing business commitments. If your income fluctuates seasonally or you've recently restructured your company, allow extra time for the construction loan application and consider engaging a broker who understands how to present self-employed financials to lenders. You can explore how we approach construction loans with clients managing variable income.

When to Lock in a Fixed Rate During Construction

Some lenders allow you to fix your rate once construction reaches practical completion and the loan converts to standard terms.

During the build, your loan typically remains on a variable rate because the progressive drawdown structure doesn't suit a fixed rate product. Once the certificate of occupancy is issued and the loan transitions to a construction to permanent loan, you can choose to fix all or part of the balance. Splitting your loan between fixed and variable gives you rate certainty on a portion while retaining the flexibility to make additional payments on the variable portion.

If interest rates are rising and you want to lock in your long-term repayment, coordinate with your broker to have a fixed rate discussion 60 to 90 days before practical completion. Most lenders will let you apply for a fixed rate conversion around 30 days before settlement, so your rate is confirmed as soon as the loan transitions. Timing this correctly can mean the difference between fixing at 5.89% or 6.29% depending on rate movements during your build. Broader refinancing strategies are covered in our refinancing section if you're also reviewing your existing debt structure.

Land and Construction Packages vs Standalone Build Finance

A land and construction package combines the land purchase and build under a single loan structure, which can simplify the approval process and reduce upfront costs.

If you're buying a block and building in one transaction, many lenders treat this as a single loan with two stages: land settlement and construction drawdown. You'll pay interest on the land component from settlement, then progressively on the build as funds are released. This structure works well for house and land packages offered by volume builders in growth areas like Marsden Park or Box Hill, where the builder has pre-approved designs and fixed price contracts ready to go.

If you already own the land or purchased it separately, you'll need a land and build loan or standalone building loan. The lender will value the land at current market rates and add the estimated construction cost to determine the total security value. You must typically commence building within a set period from the Disclosure Date, often six to twelve months, or the lender may reassess the approval. For directors building on land held in a family trust or company structure, expect additional legal and lending complexity. Your broker should structure the loan to align with your tax and asset protection strategy without triggering unnecessary stamp duty or capital gains issues.

Renovation Finance and Spec Home Finance for Experienced Builders

Renovation finance and spec home finance follow similar progressive drawdown principles but with different risk profiles and documentation requirements.

A house renovation loan is used to fund substantial works on an existing property, such as adding a second storey or reconfiguring the layout. Lenders will require detailed council plans, quotes from licensed tradespeople, and evidence that the works will add sufficient value to justify the loan amount. Interest accrues on drawn funds, and you'll typically need to demonstrate that the post-renovation value supports the total debt.

Spec home finance is for builders or developers constructing a property for sale rather than owner-occupation. Lenders treat this as a commercial or investment proposition, not a residential home loan. You'll need a clear exit strategy, evidence of comparable sales in the area, and often a pre-sale contract or demonstrated demand for the property type. Interest rates on spec home finance can be 1% to 2% higher than owner-occupied construction finance, and the loan-to-value ratio is usually capped at 70% to 80%. If you're an owner builder or constructing without a licensed builder, most major banks won't lend. You'll need a specialist lender, and the rate will reflect the additional risk.

Call one of our team or book an appointment at a time that works for you. We'll review your build plans, company financials, and cash flow to structure construction funding that aligns with your timeline and doesn't create unnecessary pressure during the build phase.

Frequently Asked Questions