Common Mistakes When Renovating Your Home

Borrowing the Full Amount Upfront When You Won't Spend It for Months

Borrowing a lump sum for renovations means you pay interest on the full amount from day one, even if your builder won't touch the kitchen for another three months. A construction-style drawdown loan lets you access funds as each stage completes, so interest only accrues on what you've actually spent.

Consider a family in Riverside planning a $90,000 renovation that will take six months to complete. If they borrow the full amount upfront on a variable rate, they're paying interest on $90,000 from settlement, even though the first $30,000 might not leave their account until week eight. With a drawdown structure, they request funds at practical intervals as invoices come due, which typically saves several thousand dollars in interest over the build period. The loan still consolidates into one facility once the renovation completes, so you're not managing multiple accounts long-term.

Most lenders will structure a renovation loan with either progress payments tied to building stages or a redraw facility where you take what you need when you need it. The second option works if you're coordinating trades yourself rather than going through a registered builder, though some lenders still prefer invoices or quotes before releasing funds.

Choosing a Fixed Rate Before Your Build Timeline Is Locked In

Locking in a fixed interest rate before your renovation starts can backfire if the project delays and you need to adjust your borrowing or access additional funds mid-build. Fixed rate loans typically don't allow you to increase the loan amount without breaking the fixed term, and break costs can run into thousands of dollars if rates have moved since you locked in.

In our experience, renovation timelines in Riverside stretch more often than they shorten. Weather, supply delays, and council approval gaps are common, and a fixed rate that looked appealing in March can become a liability by June if you need to borrow another $15,000 to cover a structural issue the builder uncovered. A variable rate or split loan structure gives you room to move without penalties. If rate certainty matters, split the loan so a portion remains variable for flexibility while the rest stays fixed for predictability.

A split structure also lets you match the loan type to how you'll use the money. The renovation portion can sit on variable with an offset account, so any savings you funnel in reduce the interest you're charged on that segment, while your existing mortgage stays fixed if that suits your repayment approach.

Assuming Your Current Lender Will Offer the Most Practical Option

Your current lender already has your business, so they have less incentive to sharpen their pencil. They'll often approve a top-up on your existing loan, but the rate, structure, and features might not match what you'd access by refinancing the whole package with a lender who actually wants your account.

Riverside sits just a few minutes from Launceston's northern suburbs, and property values have moved steadily over the last few years, which means many homeowners now have enough equity to fund a renovation without needing Lenders Mortgage Insurance. That equity position gives you leverage when comparing lenders, but only if you actually compare. Some lenders will waive application fees or offer a rate discount on the new borrowing if you bring your existing loan across as well. Others have offset accounts with no monthly fees, which makes a material difference if you're parking savings while the build progresses.

A mortgage broker can show you what's available across the full panel of lenders, not just the one you've banked with for the last decade. That comparison often uncovers loan features or rate structures that suit a renovation scenario better than a straightforward top-up.

Underestimating How Much You'll Actually Need

Most people budget for the build but forget the adjoining costs. Council fees, engineer reports, skip bins, temporary fencing, and the inevitable scope changes add up quickly, and if you've borrowed exactly what the builder quoted, you'll be scrambling for extra funds halfway through when the electrician finds old wiring that needs replacing.

As an example, a Riverside couple planned a $70,000 extension and borrowed that amount based on their builder's quote. The project uncovered asbestos in the eaves, which added $8,000 to remove safely, and they decided mid-build to upgrade the window frames for better energy efficiency, which was another $4,500. They ended up using a credit card to cover the gap, which cost them far more in interest than if they'd borrowed an extra $15,000 on the home loan from the start. Adding a buffer to your loan amount upfront is usually cheaper than patching the shortfall with personal debt later.

If you don't use the buffer, you can pay it down immediately once the renovation completes, or leave it in an offset account if your loan structure includes one. Either way, the interest cost is minimal compared to the flexibility it buys you.

Thinking Interest-Only Repayments Will Automatically Apply During the Build

Interest-only repayments can smooth your cash flow while you're paying for both the renovation and your usual living costs, but they don't activate automatically just because you're renovating. You need to request an interest-only period when you apply for the loan or top-up, and not all lenders will approve it for owner-occupied borrowing unless you can show a genuine reason, like reduced income during the build or a planned sale.

If your lender does approve interest-only, it typically runs for 12 months initially, which covers most renovation timelines. Once that period ends, the loan reverts to principal and interest repayments unless you negotiate an extension. The benefit is that your monthly commitment drops during the build, which helps if you're also paying for temporary accommodation or managing irregular trade invoices. The downside is you're not reducing the loan balance during that time, so the total interest cost over the life of the loan will be higher unless you make extra repayments into an offset or redraw when you're able.

Interest-only isn't suitable for every situation, but it's worth discussing with your broker if your cash flow is tight during the renovation phase. It's a tool, not a default.

Forgetting That Your Borrowing Capacity Drops Once the Loan Increases

Adding $80,000 to your home loan for a renovation increases your monthly repayment, which reduces how much you can borrow in the future if you need to. That matters if you're planning to buy an investment property in the next few years, or if you might need to upsize your home once the renovation is complete and your family grows.

Borrowing capacity calculations are based on your income, existing debts, and living expenses, and every additional dollar you borrow against your home reduces the amount a lender will let you borrow next time. If you're close to your borrowing limit already, a renovation loan might push you over the line, which means you'll need to pay down debt or increase your income before you can borrow again. Running a loan health check before you commit to a renovation loan shows you where you'll land after the new borrowing is factored in, so there are no surprises later.

If future borrowing matters, consider whether the renovation genuinely adds enough value to your property to justify the impact on your borrowing capacity. Sometimes it does. Sometimes it's better to stage the work or fund part of it from savings.

Renovating your home in Riverside should feel like you're building something that fits your life, not just managing another financial transaction. Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions