Using home equity for renovations
Using home equity for renovations means borrowing against the property, so it increases debt and requires lender approval. Compare that option with spending available savings or offset cash. The useful comparison is how much cash remains, how much you owe, what repayments become and what the funding costs. A renovation budget should also allow for overruns and timing; the amount spent does not guarantee an equal increase in property value.
By Ratey · General information for Australian borrowers.
Worked example: offset cash versus an extra loan
Assume a $500,000 mortgage, $80,000 in a full offset and a $50,000 renovation. Spending $50,000 from the offset leaves $30,000 cash and $500,000 debt. The balance attracting interest rises from $420,000 to $470,000.
Alternatively, suppose an approved $50,000 loan increase is fully spent on the same work and the $80,000 offset is retained. Debt becomes $550,000 and the net balance attracting interest is also $470,000 if the entire debt has the same rate and offset treatment. The household keeps more cash but also owes more.
At an illustrative constant 6% rate, the $50,000 increase in the net interest-bearing balance corresponds to about $3,000 a year before repayments and fees. Equal net balances do not make the arrangements identical: approval, required repayments, fees and product terms can differ.
Compare the funding routes on the same project
Start with one project scope and a realistic payment schedule. Then compare funding it with savings, money in an offset, available redraw or new borrowing. These options change account balances in different ways, so recording only the interest rate misses part of the decision.
ANZ’s renovation guidance describes borrowing through a loan increase or supplementary loan and using staged construction finance for major works. Product suitability and approval depend on the lender and project. Get the actual proposed structure before comparing its cost.
Write down cash retained and debt after the work
Using offset cash leaves the contractual loan balance unchanged at the moment of withdrawal but reduces the amount offsetting it. New borrowing increases debt. Redrawing previous extra repayments also changes the outstanding balance, subject to the loan’s terms.
For each option, record the opening loan, cash available, amount spent, closing debt and remaining cash. Set aside money already committed to tax, bills or another purpose. Treat the cash reserve as a deliberate choice, rather than counting every dollar in an account as available for the builder.
Compare the repayment period as well as the rate
Ask for repayments and interest over the period in which you intend to repay the renovation amount. Adding a short-lived improvement to a long mortgage can spread the cost over many years. A lower required monthly payment may reflect that longer period.
If you plan voluntary extra repayments to clear the renovation funding sooner, check whether the loan permits them and whether limits or fees apply. Put those extra payments into the household budget. A plan to repay faster is only useful if the cash flow supports it.
Get an itemised quote for valuation, application, legal and other lending costs. Where a refinance is proposed, compare the effect on the whole existing loan as well as the new renovation amount.
Match the funding to construction stages
List when deposits and progress payments are due and when funds will actually be available. Ask which evidence the lender requires before releasing each amount. A project can have enough total funding and still hit a timing problem if a payment is due before the next drawdown.
Keep a separate contingency line and decide what happens if it is used up. Include temporary accommodation or storage if the works require you to leave. Recheck a revised quote before signing a variation, because a lender’s original approval may not cover a changed project.
Use a conservative property value in your planning. The completed kitchen or extension may be valuable to you without adding the full construction cost to the lender’s valuation. The lender must assess any future borrowing on the information then available.
Your next-step checklist
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Common questions
Can I use all my equity for the renovation?
A calculator’s total equity is not an available credit limit. The lender assesses value, security and repayment capacity for the requested amount.
Will the renovation pay for itself through a higher valuation?
Do not assume construction cost equals added property value. Use a separate valuation estimate and consider whether the work fits your own plans.
Is using offset cash always cheaper?
It can avoid new lending costs, but it reduces your cash reserve and interest offset. Compare actual product terms, rates, fees and repayment periods.
Sources and assumptions
These primary sources support the explanations above. Examples use invented figures to show the calculation or decision; they are not available loan offers. Check your lender’s terms for your circumstances.
Calculations are estimates and do not establish borrowing eligibility. Read the calculation methodology.
Estimate the equity before comparing funding
Check the property calculation, then discuss the required amount and repayments with a lender.