Construction Loans for Multi-Unit Development Sites

What Makes a Multi-Unit Development Site Different from Standard Construction Finance

A construction loan for a multi-unit development site operates on a progressive drawdown structure, but lenders treat these applications differently from single dwelling projects. The key difference lies in how they assess feasibility, require detailed cost breakdowns for each stage, and often impose stricter loan-to-value ratios.

Consider a buyer purchasing a development site in South Perth to build three townhouses. The lender will require council-approved plans, a fixed price building contract from a registered builder, and a detailed cost plus contract that separates land acquisition, demolition if applicable, construction costs per dwelling, and holding costs during the build. Unlike a standard land and construction package, the lender evaluates the end value of all three dwellings combined, not just one property.

Most lenders will fund up to 70% to 80% of the total project cost, meaning you'll need a deposit that covers the land purchase shortfall plus enough equity or cash to bridge any funding gaps during construction. The progressive drawdown operates on a progress payment schedule tied to construction milestones, but the lender will also scrutinise your exit strategy. They want to know whether you're selling all three units upon completion, retaining them as investment properties, or a combination of both. Your answer affects serviceability calculations and the loan structure they'll approve.

How the Progressive Drawing Fee and Drawdown Process Works

Lenders release funds in instalments tied to verified construction stages, and they only charge interest on the amount drawn down at each phase. A typical progress payment finance structure for a multi-unit site might include five to six stages: slab down, frame up, lock-up, fixing, practical completion, and final inspection. At each stage, the builder requests payment, the lender arranges a progress inspection, and funds are released directly to the builder once the inspector confirms the work meets the required standard.

Each drawdown attracts a Progressive Drawing Fee, usually between one hundred and three hundred dollars per inspection, depending on the lender and the project's complexity. These fees add up across a multi-unit build, so factor them into your total project budget. If you're building three townhouses and each property requires six inspections, you're looking at up to eighteen separate drawdowns and corresponding fees.

During construction, you'll typically make interest-only repayments on the amount drawn down so far. If the lender has released two hundred thousand dollars for the slab and frame stages, you'll pay interest only on that amount until the next drawdown occurs. Once construction reaches practical completion, the loan converts to a standard principal and interest structure, or you refinance into separate loans for each dwelling if you're planning to sell or hold them individually.

Council Approval and Development Application Requirements

No lender will approve construction funding for a multi-unit site without a development application approved by the local council. In South Perth, this means submitting plans that comply with the City of South Perth's planning scheme, including setbacks, plot ratio, parking requirements, and design guidelines for medium-density housing. The council approval must be unconditional or subject only to minor conditions that don't affect the build's feasibility.

Lenders also require that you commence building within a set period from the Disclosure Date, usually six to twelve months. If you purchase a development site but delay the build, the construction loan approval will lapse, and you'll need to reapply. This timeline pressure means you need your registered builder, fixed price building contract, and council plans locked in before you settle on the land purchase.

In some cases, buyers purchase the land with a standard investment loan or commercial loan, then apply for construction funding once council approval is finalised. This approach gives you more time to secure approvals without the pressure of a ticking construction loan timeframe, but it requires enough serviceability to carry both the land loan and the construction facility during the build phase.

What Happens If Construction Costs Exceed the Original Budget

Multi-unit builds are more vulnerable to cost overruns than single dwellings because the scope is larger and the construction timeline is longer. If your builder encounters unexpected site conditions, such as contaminated soil or rock that requires removal, the project cost can increase quickly. Lenders base their progressive drawdown on the original fixed price building contract, so any cost increase beyond that figure becomes your responsibility to fund.

Most lenders won't increase the loan amount mid-construction unless the property's end value has also increased and you have additional equity or cash to inject. If the original contract price was eight hundred thousand dollars and the lender approved 75% of that amount, they've committed to releasing up to six hundred thousand dollars across the build. If costs blow out to nine hundred thousand dollars, you'll need to cover the extra one hundred thousand dollars from your own resources.

This is one reason why experienced developers build a contingency buffer into their initial budget and avoid borrowing at the maximum loan-to-value ratio. A 70% loan-to-value ratio leaves more room to absorb variations without running out of funds halfway through the build.

Owner Builder Finance and Why Most Lenders Won't Approve It for Multi-Unit Sites

If you're considering acting as an owner builder to save on builder's margins, you'll find that most mainstream lenders won't provide construction funding for multi-unit projects unless a licensed registered builder is managing the build. Owner builder finance is difficult to secure even for single dwellings, and for a multi-unit development, lenders view the risk as too high.

The logic is straightforward. A registered builder carries warranty insurance and has established relationships with sub-contractors, including plumbers, electricians, and concreters. They also manage the construction draw schedule and ensure that each stage is completed to a standard that passes inspection. An owner builder, even one with construction experience, introduces variables that lenders aren't willing to underwrite on a larger project.

If you're determined to manage the build yourself, you'll likely need to fund the project without traditional construction finance, either through cash, private lending, or a commercial facility that's structured outside standard residential lending criteria. For most buyers, engaging a registered builder under a fixed price building contract remains the most practical path to securing approval.

Interest Rate Structure and Repayment Options During the Build

Construction loan interest rates are typically higher than standard home loan rates because the lender carries more risk during the build phase. The property doesn't yet exist, so the security is incomplete until practical completion. Rates are usually variable, and you'll make interest-only repayment options during construction, calculated on the amount drawn down at each stage.

Once the build is finished and the properties reach practical completion, you have several options. You can convert the construction loan to a standard investment loan if you're retaining the dwellings, refinance into separate loans for each unit, or sell one or more properties and pay down the debt. Your choice depends on your long-term strategy and serviceability.

If you're planning to sell upon completion, some lenders will allow you to remain on interest-only repayments for a short period post-completion while you market the properties. Others will require you to switch to principal and interest immediately. Clarify this with your lender before you commit, as it affects your cash flow in the months after the build finishes.

How Serviceability Is Calculated for Multi-Unit Development Loans

Lenders assess your ability to service a multi-unit construction loan based on your current income, existing debts, and the rental income the completed properties will generate if you're holding them as investments. They'll apply a rental assessment at a discounted rate, usually around 80% of the expected market rent, and subtract ongoing costs like strata fees, council rates, and property management.

If you're building three townhouses in South Perth and each is expected to rent for five hundred and fifty dollars per week, the lender will assess serviceability based on around four hundred and forty dollars per week per property after applying their shading. They'll also factor in the interest cost on the full loan amount, even though you're only paying interest on the drawn portion during construction.

This dual assessment often creates a serviceability gap. You might qualify for the loan based on end value and rental income, but struggle to prove you can carry the debt during the construction phase when you're paying interest without receiving rent. Some buyers bridge this gap by holding off on the development until they've built more equity in other properties or increased their income. Others structure the loan so that they sell at least one dwelling upon completion, which reduces the debt and improves serviceability for the remaining units.

Call one of our team or book an appointment at a time that works for you to discuss how construction funding for a multi-unit site would apply to your situation and what structure suits your development plans.

Frequently Asked Questions