Beginner's Guide to Renovating Your Home

Understanding How Renovation Funding Works

You can fund a renovation by borrowing against equity in your home, taking out a personal loan, or refinancing to release additional funds. Most academics choose to access equity because the interest rate on a home loan sits lower than unsecured credit, and repayments stretch over a longer term. Lenders will assess your application based on the property's value after renovation, not just its current worth, which means you can often borrow more than you might expect.

Consider a scenario where you own a property valued at $650,000 with $400,000 still owing. You want to add a second bathroom and update the kitchen at a cost of $80,000. A valuer estimates the completed work will lift the property value to $720,000. The lender will typically allow you to borrow up to 80% of that post-renovation value, which in this case is $576,000. After repaying your existing $400,000 loan, that leaves $176,000 available. You take $80,000 for the renovation and keep the remainder in an offset account to reduce interest while maintaining access to funds if the project runs over budget.

The structure you choose matters as much as the amount you borrow. Some lenders offer a construction-style drawdown where funds release in stages as the work progresses. Others provide the full amount upfront. The staged approach works if you're managing multiple trades and want to control cash flow, but it adds administrative steps. If you're working with a builder on a fixed-price contract, taking the funds in one go and parking them in offset often makes more sense.

How Lenders Assess the Renovation Value

Lenders require a valuation that includes your proposed renovation, not just the property as it stands today. You'll need to provide detailed plans, quotes from licensed builders, and a scope of works that outlines what you're doing and what it will cost. The valuer uses this information to estimate the property's value once the work is complete. That figure determines how much you can borrow.

If the valuation comes in lower than expected, you'll either need to reduce the scope of work or contribute more of your own funds. In our experience, this happens most often when the renovation doesn't align with the surrounding market. Adding a swimming pool in a suburb where most homes have modest backyards won't deliver the same valuation uplift as adding a second living area in a family-oriented precinct.

Some lenders will accept a desktop valuation for smaller renovation amounts, typically under $50,000, which speeds up the process. For larger projects, expect a full inspection. The valuer will also check whether the work requires council approval, and if it does, the lender will want to see that approval before releasing funds.

Splitting Your Loan to Manage Rate Risk

When you refinance to access equity for a renovation, you're increasing your total loan amount. That's a good time to reconsider your rate structure. A split loan lets you fix part of the new borrowing while keeping the remainder on a variable rate. If you're taking out an additional $80,000, you might fix $60,000 over three years to lock in repayments during the renovation period, then leave $20,000 on variable so you can make extra repayments without penalty once the work is done.

Fixed rates suit borrowers who want certainty while managing renovation costs and don't want repayment fluctuations adding to the pressure. Variable rates suit those who plan to pay down the renovation debt quickly, particularly if you're redirecting what used to be rent from an investment property or a pay rise into the loan. The proportion you fix depends on your cash flow and how much flexibility you need. There's no single right answer, but splitting gives you both.

Using Equity Without Refinancing Your Whole Loan

If your current home loan has a competitive rate and features you want to keep, you can access equity through a separate top-up loan rather than refinancing the entire amount. This approach works when your existing lender offers renovation lending and you're within their loan-to-value limits. You keep your original loan untouched and take out a second loan secured against the same property.

As an example, you might have $500,000 remaining on a variable loan at a discounted rate you negotiated two years ago. Instead of refinancing that $500,000 and potentially losing the rate discount, you apply for a $70,000 top-up with the same lender to fund your renovation. The two loans run in parallel, each with their own account and repayment schedule. You can structure the top-up differently, perhaps on a fixed rate or with an offset account attached, depending on what suits the renovation timeline.

Not all lenders offer this structure, and some will require you to refinance the full amount regardless. If keeping your existing loan matters to you, confirm the lender's approach before you start the application. In some cases, switching lenders entirely and refinancing the total amount delivers a lower rate overall, even if you lose the discount on the original portion.

What Happens If the Renovation Runs Over Budget

Renovation costs exceed the original quote more often than most people expect. Structural issues that only become visible once walls are opened, council requirements that weren't flagged in the initial scope, or material price increases can all push the budget higher. If you've borrowed exactly what the quotes suggested, you'll need to find additional funds or scale back the work partway through.

The way to manage this is to borrow slightly more than the quoted cost and hold the buffer in an offset account. If the project comes in on budget, you pay down the extra amount immediately. If costs increase, you've got the funds available without needing to go back to the lender mid-renovation. For a project quoted at $80,000, borrowing $90,000 and offsetting $10,000 gives you that buffer while only paying interest on what you actually draw.

Some lenders will allow you to increase the loan amount during the renovation if the valuation supports it, but that involves another application, another valuation, and more time. It's far simpler to build contingency into the original borrowing.

How Renovations Affect Your Borrowing Capacity Later

Increasing your loan amount to fund a renovation reduces your borrowing capacity for future lending. Lenders assess your ability to service debt based on your income and existing commitments, and a larger loan means higher repayments. If you're planning to buy an investment property or upgrade to a bigger home in the next few years, factor that into your decision about how much to borrow now.

A renovation that increases your property value does improve your equity position, which helps when you apply for future lending, but it doesn't offset the impact of higher repayments on your serviceability. If you're earning $120,000 and your repayments increase by $400 per month after the renovation, that reduces what you can borrow next time by roughly $80,000, depending on the lender's assessment rate.

One approach is to renovate in stages, particularly if the work isn't urgent. Complete the highest-value improvements now, pay down some of the debt, then return to the remaining work once your income increases or your loan balance drops. That spreads the cost and limits the impact on your serviceability at any one time.

When It Makes Sense to Wait

Not every renovation justifies borrowing more. If the work you're planning won't increase the property's value by at least the amount you're spending, you're better off saving and funding it from cash flow. Cosmetic updates like painting, landscaping, or new window furnishings rarely add enough value to justify increasing your loan, particularly when you factor in interest over the life of the loan.

Renovations that add functional space, such as an extra bedroom, bathroom, or living area, generally provide a stronger return. So do updates that bring an older home in line with current market expectations, such as replacing an outdated kitchen or bathroom. The return depends on the suburb and the type of property, which is why the valuation matters. If the valuer's estimate suggests the completed work will add $100,000 to the property value and you're spending $80,000, the numbers work. If the uplift is only $60,000, reconsider the scope.

Call one of our team or book an appointment at a time that works for you. We'll review your equity position, discuss your renovation plans, and structure a home loan that suits your timeline and budget without overextending your repayments.

Frequently Asked Questions