Knockdown Rebuild Finance: The Pros and Cons

A knockdown rebuild means demolishing an existing property and constructing a new one on the same block. For first-time property investors, this approach can unlock development potential in established suburbs without navigating subdivision or rezoning, but the financing works differently to a standard home loan.

How Construction Finance Differs From a Standard Home Loan

Construction finance releases funds progressively as the build reaches each stage, not as a lump sum at settlement. Lenders only charge interest on the amount drawn down at each progress payment, which means your loan balance increases throughout the build rather than being fully drawn from day one.

Consider an investor purchasing a tired weatherboard in Oakleigh for demolition and rebuild. The lender might approve a total facility covering the land purchase and construction costs, but the loan is split into two components. The land portion settles at purchase, while construction funding releases in stages tied to a progress payment schedule. Each drawdown requires a progress inspection by the lender or their appointed valuer, and most lenders charge a Progressive Drawing Fee for each inspection, typically between $300 and $500 per draw.

The builder provides a fixed price building contract with a defined progress payment schedule, usually five or six stages such as base, frame, lockup, fixing, and completion. Your lender's construction draw schedule needs to align with the builder's payment terms, which is why lenders prefer working with registered builders using fixed price contracts rather than cost plus arrangements.

Interest-Only Repayments During Construction

Most construction loans offer interest-only repayment options during the build, calculated only on funds drawn down so far. This keeps repayments lower while the property generates no rental income and you're potentially covering other accommodation costs.

In a scenario where construction costs total $450,000 released across six payments, your repayments start on the first progress payment of perhaps $90,000, then increase as each subsequent drawdown occurs. By lockup stage, you might have drawn $300,000, so repayments reflect that balance rather than the full loan amount. Once construction completes and the property is liveable, the loan typically converts to principal and interest repayments based on the full amount drawn.

Lenders usually allow interest-only periods during construction plus an additional 12 months after completion, giving investors time to settle tenants and establish rental income before principal repayments begin.

The Deposit and Equity Position

Lenders assess knockdown rebuild projects based on the combined land purchase price and construction costs, with most requiring at least 20% deposit or equity to avoid Lenders Mortgage Insurance on investment properties. The challenge is that your deposit needs to cover both components upfront, even though construction funds release progressively.

An investor using equity from an existing property needs sufficient usable equity to cover the land component plus construction costs, not just the land value. If the land costs $600,000 and the build another $450,000, the total project is $1,050,000. With a 20% deposit requirement, you need $210,000 in equity or cash, plus another $25,000 to $35,000 for settlement costs, demolition, and holding costs during construction.

Some lenders assess the loan against the 'as if complete' valuation rather than just land value, which can improve your borrowing position if the finished property will be worth significantly more than land plus construction costs combined. Not every lender offers this approach for investment loans, so comparing construction loan options matters.

Council Approval and Timing Requirements

Your lender will require council approval for the development application before releasing construction funds, though some will settle the land purchase before plans are finalised. Most construction loan approvals require you to commence building within a set period from the Disclosure Date, usually six to twelve months, which means your council plans and registered builder need to be locked in before formal loan approval.

In suburbs like Glen Waverley or Mount Waverley where planning overlays or heritage controls apply, council approval can take longer than anticipated. Delays in obtaining permits can push you past the commencement deadline in your loan approval, forcing you to reapply or accept rate changes if the lender's construction loan interest rate has moved since original approval.

Building timeframes also affect your holding costs. While construction funding only charges interest on amounts drawn down, you're still paying interest on the land component from settlement, plus ongoing council rates, insurance, and potentially rent elsewhere. A build quoted at five months that stretches to eight months adds three months of holding costs with no rental return.

The Pros: Development Upside in Established Areas

Knockdown rebuild lets you create a new investment property in suburbs where vacant land is scarce or where buying an equivalent new home would cost significantly more. Older homes on larger blocks in areas like Blackburn, Burwood, or Nunawading can offer better value as a knockdown rebuild than purchasing a recently built property in the same street.

A new build also means minimal maintenance costs for the first several years, full depreciation benefits on construction costs and fixtures, and potentially higher rental yields compared to older stock in the same location. For investors, the tax depreciation on a brand new build can offset a significant portion of holding costs, particularly in the first five to ten years.

You also control the design and layout, which means you can build to suit tenant demand in that specific area rather than working with an existing floorplan that might not appeal to renters.

The Cons: Complexity and Holding Costs

Construction finance involves more steps, more documentation, and more variables than purchasing an established property. You're managing a builder, coordinating progress inspections, ensuring each drawdown aligns with the builder's payment schedule, and covering holding costs throughout the build with no rental income.

Cost overruns are another risk. While a fixed price building contract protects you from most variations, changes you request during construction or unforeseen site issues like poor soil conditions can add to the final bill. Lenders approve construction funding based on the contracted build cost, so any overruns need to be funded from your own resources unless you can increase the loan, which isn't guaranteed.

Construction loans also typically carry slightly higher interest rates than standard variable home loans, and the Progressive Drawing Fee for each inspection adds to your costs. If you're comparing a knockdown rebuild to purchasing an established investment property, factor in these additional costs and the income lost during the build period.

Switching to Permanent Finance After Completion

Once construction completes and you receive a Certificate of Occupancy, your construction loan converts to a standard home loan, often called a construction to permanent loan. Some lenders automatically roll the facility into their standard variable or fixed rate products, while others require you to formally refinance.

If your lender's ongoing interest rate isn't competitive, you can refinance to a lower rate once the property is complete and tenanted. The property will be revalued as a completed dwelling rather than land under construction, which often improves your loan-to-value ratio and opens up more refinancing options.

Most investors switch from interest-only to principal and interest repayments at this point, using rental income to cover the higher repayment while starting to reduce the loan balance. Others maintain interest-only if they're planning to use equity from the completed build to fund another investment purchase.

Comparing Land and Construction Package Finance

Some investors confuse knockdown rebuild finance with land and construction package loans. A land and construction package usually refers to purchasing vacant land and building on it, often in new estates on the suburban fringe. Knockdown rebuild involves buying a property with an existing dwelling, demolishing it, and building new.

The financing structure is similar in that both release funds progressively, but knockdown rebuild carries additional costs for demolition, asbestos removal if the existing home was built before 1990, and potentially disconnection and reconnection of services. You're also buying in an established suburb where land values are usually higher, which affects your total loan amount and deposit requirements.

Lenders generally view knockdown rebuild in established areas more favourably than vacant land purchases on the fringe because the location carries less risk and the completed property is more likely to align with 'as if complete' valuations.

What to Confirm Before You Commit

Before signing a contract on a knockdown rebuild project, confirm your lender will finance both the land and construction components, that your builder is acceptable to the lender, and that the progress payment schedule matches the lender's standard drawdown stages. Not all builders structure payments the way lenders prefer, which can create funding gaps or require you to cover certain stages out of pocket.

Also confirm the total project cost including demolition, site costs, service connections, and landscaping fits within your approved loan amount. Builders quote the construction cost, but demolition and site preparation are often additional and can add $15,000 to $40,000 depending on the existing structure and site conditions.

Call one of our team or book an appointment at a time that works for you. We'll assess your equity position, compare construction loan options from lenders who understand knockdown rebuild projects, and make sure the numbers work before you commit to a contract.

Frequently Asked Questions