Estimate the value a renovation could add to your property and how that change in value might affect your Help to Buy equity share with the government. The calculator lets you compare the net return from renovating against the cost of buying back the government's equity stake, using your own cost and growth assumptions.

How much should I budget for a kitchen or bathroom renovation in Australia?

A mid-range kitchen renovation typically costs between $25,000 and $45,000, covering new benchtops, cabinetry, appliances and a splashback. A mid-range bathroom sits between $15,000 and $35,000, with the national average around $26,000 according to HIA figures. These are starting points - labour accounts for 40-50% of kitchen costs, and bathrooms frequently uncover hidden waterproofing or plumbing issues once walls are opened. Your actual costs will depend on your state, the scope of work, and the tradespeople you engage.

What contingency buffer should I add to my renovation budget?

The calculator automatically adds a 15% contingency buffer to your total renovation spend. This is the mid-range figure recommended by the Master Builders Association and ASIC MoneySmart for residential renovations - 10% is the minimum for purely cosmetic work, and 20% is more appropriate for structural changes. Kitchen and bathroom renovations in particular frequently run 20-30% over initial quotes, so building in a buffer before you start is one of the most practical steps you can take.

What does renovation ROI mean, and which renovations give the best returns?

ROI (return on investment) measures how much value a renovation adds compared to what it costs. As an illustration, an ROI of 80% would mean a $10,000 spend adds roughly $8,000 to your property value. Based on 2025-26 Australian market data, painting a whole house ($6,000-$18,000) and landscaping ($5,000-$30,000) have historically been among the higher-return categories - in some cases the value added may exceed the spend - because they can lift street appeal and listing photos. Kitchens and bathrooms have also tended to deliver solid returns. Swimming pools sit among the lowest-ROI renovations at around 20-50% and can reduce buyer appeal because of maintenance costs and insurance impacts. These are general market patterns, not a guarantee: actual returns vary by suburb, timing and finish quality, and the final value added is determined by the market at sale.

What is overcapitalisation and how does the calculator flag it?

Overcapitalisation is when you spend more on renovations than the local market will pay back in added property value. The calculator flags a warning when your planned renovation spend exceeds 10% of your current property value - the threshold identified by HIA and CoreLogic where additional spending typically stops adding proportional resale value. This is a guideline rather than a hard rule, and outcomes vary significantly by suburb and property type, so getting a local agent's view on comparable sales before committing to a large spend is worthwhile.

If I am on the Help to Buy shared equity scheme, what renovation rules apply?

Under Help to Buy, renovations costing under $20,000 that do not need council approval can generally proceed without notifying Housing Australia. For any renovation above $20,000, or one that requires council approval, you must notify Housing Australia before starting - they then arrange valuations before and after the work. The value added by an approved renovation is credited to you, which reduces the government's equity percentage. If you do not notify when required, you may not receive that equity credit and the government may retain its original share. The government's share can be up to 40% for new properties and up to 30% for existing ones. Housing Australia makes the final determination, so confirm the current rules with them before starting.

How does renovating compare to buying back the government's equity share directly?

Under Help to Buy, you can buy back equity directly by paying Housing Australia in cash, with each payment generally needing to be at least 5% of the property's current market value. The tool compares that direct buyback cost against the renovation spend required to achieve a similar reduction in the government's equity percentage. Because renovation value-add is credited to you, a well-chosen renovation could reduce the government's share by an amount similar to a direct cash payment but at a lower out-of-pocket cost - though this is only an estimate based on the figures you enter and depends on the actual ROI of the renovations you select.

Which renovations need council approval, and does that affect the Help to Buy notification requirement?

Structural work generally requires council approval - this includes removing load-bearing walls, extending the home, adding a bedroom through a conversion or extension, building a pool, or adding a carport. Cosmetic work like painting, replacing flooring, or a like-for-like kitchen or bathroom update typically does not require approval, though rules vary by state and council. Under Help to Buy, any renovation that requires council approval generally triggers the notification requirement regardless of cost, even if the spend is below $20,000. Always confirm approval requirements with your local council before starting work.