Understanding the Basics of Construction Investment Loans

A construction loan for an investment property operates differently to standard home lending because you draw funds progressively as the build advances, with repayments calculated only on the amount released at each stage. This structure means you are not paying interest on the full loan amount from day one, which reduces holding costs during the construction phase.

Most lenders require land purchase to settle before construction finance is approved, though some structures allow both components to be included in a single facility. Once the build begins, funds are released according to a progress payment schedule tied to completed stages verified by an independent inspector. Loan terms, deposit requirements, and eligibility criteria for construction finance differ from those applied to established property purchases, and understanding how drawdown schedules align with builder contracts is essential before committing to a project.

How Construction Finance Differs from Standard Investment Loans

Construction finance releases funds in stages as building work progresses, rather than providing the full loan amount upfront. During construction, you typically pay interest only on the drawn balance, with principal and interest repayments beginning once the property is complete and valued at finished market value.

Consider an investor purchasing land in Mandurah for a dual occupancy project. The land settles using a standard investment loan, then construction finance is activated once council approval is confirmed and a fixed price building contract is executed with a registered builder. At the first progress payment, the lender releases funds for the base stage, and interest is charged only on that portion. Each subsequent drawdown is triggered by a progress inspection confirming the completed work matches the builder's invoice.

The transition from construction to a standard loan occurs once the final inspection is passed and the valuation reflects the completed property. At that point, the facility converts to principal and interest repayments unless you have specifically structured it to remain interest-only for a defined period, which is common for investment properties where rental income is used to service the debt.

Deposit and Equity Requirements for Investment Builds

Lenders typically require a minimum 20% deposit for investment property construction, calculated on the combined value of land and building contract. If you already own suitable land, equity in that parcel can contribute toward the deposit, though a valuation will determine how much usable equity exists after accounting for any existing debt.

In a scenario where an investor owns land valued at $250,000 with no mortgage, that equity can offset part of the deposit requirement for a $400,000 build. The lender assesses total project cost at $650,000, requiring $130,000 in equity or cash. The land contributes $250,000, which exceeds the threshold, so no additional cash deposit is needed. However, the investor still requires funds to cover stamp duty on the construction contract, council and utility connection fees, and lender establishment costs, which can total $15,000 to $25,000 depending on the project scope.

Where land is being purchased alongside the build, the deposit applies to the combined transaction. Lenders will also assess your borrowing capacity differently during construction, as rental income cannot be claimed until the property is tenanted, meaning serviceability is calculated on your existing income without offset from projected rent.

Progress Payment Schedules and Drawdown Timing

A progress payment schedule outlines when builder payments are due, typically tied to five or six key stages such as base, frame, lockup, fixing, and practical completion. The lender's drawdown schedule must align with these milestones, and each payment is subject to a progress inspection conducted by a third party valuer or building consultant.

Most builders issue invoices as each stage is reached, and your broker submits a drawdown request to the lender along with the invoice and any required certifications. The lender arranges an inspection, and once the inspector confirms the stage is complete and the work matches the invoice value, funds are released directly to the builder. This process can take between three and ten business days depending on the lender and inspector availability, so delays in drawdown requests can hold up construction if not managed carefully.

Some lenders charge a progressive drawing fee each time funds are released, typically between $150 and $400 per drawdown. Others include a set number of drawdowns in the loan establishment fee. Understanding these costs upfront allows you to budget accurately, particularly if your builder uses a payment structure with more stages than the lender's standard schedule.

Fixed Price Contracts and Cost Plus Structures

Lenders strongly prefer fixed price building contracts where the total build cost is agreed upfront and variation approvals are required for any changes. A fixed price contract provides certainty for both borrower and lender, as the loan amount is determined at approval and does not shift unless variations are formally documented and re-assessed.

Cost plus contracts, where the builder charges for materials and labour with a margin added, are more difficult to finance because the final cost is not locked in at the outset. Only a small number of specialist lenders will consider cost plus arrangements, and those that do typically require larger deposits, lower loan to value ratios, and more frequent progress inspections to manage risk. Owner builder projects face similar constraints, with most mainstream lenders declining to provide finance unless the borrower holds trade qualifications or can demonstrate prior building experience.

For investors, a fixed price contract with a registered and insured builder is the most efficient path to loan approval. Variations should be minimised and submitted for lender approval before work begins, as retrospective variations can complicate drawdowns and delay final settlement.

Interest Calculations During the Build Phase

During construction, you are only charged interest on the amount drawn down, not the total approved loan. This reduces holding costs compared to purchasing an established property with a full loan balance active from settlement. Interest is typically calculated daily and charged monthly, with repayments structured as interest-only until construction is complete.

In our experience, investors often underestimate the cash flow benefit this structure provides during the build. For a $500,000 construction loan drawn in five stages over six months, the average daily balance might be $250,000 rather than the full amount. At current variable rates, this can result in several thousand dollars in interest savings compared to a scenario where the full amount was drawn on day one.

Once the final drawdown is completed and practical completion is certified, the loan converts to a standard construction to permanent loan, meaning it transitions to principal and interest repayments unless you have arranged an interest-only period. Most lenders allow interest-only terms of one to five years on investment properties, which aligns with the strategy of using rental income to cover interest while retaining capital for further investments or debt reduction on other properties.

Development Applications and Council Approval Requirements

Lenders require evidence of council approval before releasing construction funds, and the approval must permit the intended use of the property. For investment builds, this means the development application must specify residential tenancy as a permitted use, and any conditions imposed by council must be capable of being satisfied within the construction timeline.

In Mandurah, where infill development and dual occupancy projects are increasingly common, council approval can take between eight and sixteen weeks depending on the complexity of the application and whether public consultation is required. Delays in approval can affect your ability to commence building within the timeframe specified in your loan approval, which is typically six to twelve months from the disclosure date. If construction does not begin within that window, the loan approval may lapse and require resubmission, potentially at different rates or terms.

Your builder or architect typically manages the development application process, but as the borrower, you are responsible for ensuring all approvals are in place before the first drawdown is requested. Missing documentation or unresolved council conditions will halt the release of funds, so coordinating with your builder and broker throughout the approval phase is necessary.

Loan Serviceability and Rental Income Assumptions

Lenders assess your ability to service a construction loan based on your current income, as rental income cannot be included in serviceability calculations until the property is complete and tenanted. This differs from purchasing an established investment property, where rental income is factored in at application based on a rental appraisal.

For borrowers with multiple investment properties or high levels of existing debt, this can create a serviceability gap that affects loan approval. Some investors address this by structuring the construction loan with a longer interest-only period or by timing the build to coincide with debt reduction on other assets. Others use cash reserves or offset accounts to demonstrate capacity to cover repayments during the construction phase without relying on rent.

Once construction is complete and a tenant is secured, you can request a loan variation to include rental income in your serviceability assessment, which may allow you to access additional borrowing capacity or refinance to more competitive terms. Working with a broker who understands investment lending structures ensures your application is positioned correctly from the outset, reducing the likelihood of declined applications or conditional approvals that cannot be satisfied.

Call one of our team or book an appointment at a time that works for you to discuss your construction investment project and confirm which lenders and structures suit your circumstances.

Frequently Asked Questions