Free Renovation Cost Calculator Australia: 5-Minute Estimate

A free renovation cost calculator gives an estimate in five minutes based on the entered information of scope, location and finish. In Australia, "renovation calculator" means 2 separate calculators: renovation estimate calculator & loan estimate calculator. The majority of users use one and don't even look at the other one.

The published content of four Australian tools were examined - "What's The Damage" calculators, ING and Suncorp (with Core Logic), as well as a broker's loan calculator. Since I have not been able to use any of these tools myself, the descriptions have been written based on the publishers' explanations. The example provided on this guide uses my own sample numbers, which are not taken from any given tool. Please be aware, this is general information, not financial advice.

Want your renovation budget tracked against real invoices from day one? Start a free FlipSync IQ trial and set up your first project.

Free Renovation Cost Calculator Datasheets: Four Australian Tools

Each card shows what the publisher says the tool needs, returns, and leaves out.

Tool	Type	Inputs	Output	Stated limits
What's The Damage calculators (prices verified Oct 2026)	Cost	Measurements and city, 15 cities plus a national figure	Low, typical, and high range; kitchen and bathroom by finish level or item by item	Not quotes; site condition, materials, and timing can change the price; GST basis not stated
ING Renovation Calculator (launched Dec 2019, with CoreLogic and Cordell data)	Cost	Suburb and project answers	One total including builder's margin and GST	"Indicative guide only"; excludes design choices, site and structural conditions, materials, and planning rules
Suncorp Bank calculator (launched Aug 2020, CoreLogic data)	Cost	Suburb, project type, fixture quality	A cost for each project; data updates quarterly	A budgeting aid, not a quote
Credit One loan calculator (dated Oct 2026)	Finance	Loan amount, term of 1 to 7 years, rate	Repayment, or borrowing capacity	Guide only; does not state repayment method or fees

Check if the tools for both ING and Suncorp are still online before trying to use them. There is a quote request link along with each estimate in What's The Damage and Credit One is a finance broker too.

What a Renovation Cost Calculator Cannot See

The 'stated limits' column just restates the acrossall the following tools: site and structural conditions, particular supplies, design choices, and native planning regulations (ING); entry, website circumstances, and timing (what's The injury).

Essentially, the calculator is returning an average job estimate for that suburb. A calculator can't predict if there's something different about that job – whether its a sunken subfloor, difficult access or a council overlay that the form doesn't ask about. These bits have to be filled with contingency and quotes.

A calculator gives an approximation on paper, but it is only a written quote which can tell you the exact price for your particular site.

The Average-Loan Trap in Renovation Cost Calculator Research

A Google search for "average renovation cost" will bring up a figure of $63,000. According to Property Update's 2024 guide, the $63,000 to $72,000 figure is sourced from Suncorp lending data. According to a page on Suncorp Bank, this would be the average amount borrowed by homeowners between July 2019 and June 2020, which was $63,188.

This is a loan from the bank's OWN customers, 6 years ago. It is neither a budget estimate nor a standard per project. Also the Suncorp page contains contradictions, stating in the text an average of $63,188 and in a box of $63,118, with Western Australia at one point 54,377 and at another 71,067, also quoted for Victoria.

This is why a calculator is a more meaningful starting point than an average. An approximate, Scoped estimate of the market for a specific suburb is better than a six-year-old lending average.

The Five-Minute Renovation Cost Calculator Method

Example routine which can be timed with a stopwatch: property flip with an $850,000 ARV and $95,000 in repair allowance (can also be from your deal model) 

Minute	Task	Example result
1	List the scope in four lines: kitchen, bathroom, paint and flooring, services	Four lines
2	Run each line through a calculator and record low, typical, and high	$61,000 / $89,000 / $125,000
3	Add 15% contingency to typical and high (Three Birds suggests 10% to 20%)	$102,350 / $143,750
4	Convert the total into a finance cost if you borrow	See the next table
5	Compare each case with your repair allowance	Pass, fail, or fail

The low case has $34,000 headroom over an allowance of $95,000. The normal case (with contingency) goes over the allowance by $7,350, the high case by $48,750.

That means the deal is only feasible if everything goes right. If a price only succeeds in the low case, it is completely optimistic accounting. Other options: renegotiate the price, cut a line, or stop.

Each solution comes at a cost. Lowering the purchase price impacts all scenarios at once, so it is the most efficient, lowest risk move. Taking out a line costs money but could hurt the property's marketability. Walking away comes without risk of cost, other than time. Sitting down with a renovation cost calculator for 5 minutes beats learning about a $48,750 shortfall in week six.

Curious how a repair allowance changes your maximum purchase price? See how FlipSync IQ reverse-calculates your ceiling from your ARV and scope.

Reading the Spread: Which Renovation Cost Calculator Line to Quote First

The range from low to high is the amount of uncertainty. As can be seen in the example, each row differs by about a factor of two.

Line	Low	High	High vs low
Kitchen	$22,000	$45,000	2.05 times
Bathroom	$16,000	$34,000	2.1 times
Paint and flooring	$14,000	$26,000	1.9 times
Services (electrical and plumbing)	$9,000	$20,000	2.2 times

In the widest areas, services are usually hidden behind walls. Before quoting this line, ensure you have a qualified electrician and plumber on site. In this area, the most likely high estimate is more likely than the most likely on the paint and flooring the spread is narrowest in that area which makes it most reliable.

Factors include location: Providing 15 cities is better than providing a national average with "what's The Damage". If your suburb isn't represented, check with a local builder as to how much the location differs from the nearest city.

Want to see how each repair line moves your margin? Run a free feasibility check in FlipSync IQ and compare plan to actual.

Renovation Cost Calculator Finance Check: What $60,000 Costs a Month

Use the second form of renovation calculator for the 4th minute of this analysis. Based on a budget of $60,000, the example provided by Suncorp has been used in this calculation. The interest rate used is 5.90% as shown by Credit One as a comparison for the example. The webpage does not specify if this is fixed or variable so it shall be used as a general interst rate for this calculation. Repayments are based on amortization calculations. 

Term	Monthly repayment	Total interest
3 years	$1,823	$5,614
5 years	$1,157	$9,431
7 years	$874	$13,386

It's clear that a longer term results in a higher interest cost and a lower monthly payment. If we are talking about a property flip then the cost of interest is actually small compared to all the other holding costs that are incurred whilst the renovation is in process. Canstar points out that a construction loan is paid in installments meaning interest is only paid on the amount that has been used. Ask your broker about the current terms.

The Three-Number Log for Any Renovation Cost Calculator

The value of a calculator result can only be appreciated by its comparison to a further result. Record three numbers to a line. The values below are only examples.

Line	Calculator (typical)	Written quote	Actual invoice	Quote vs calculator	Actual vs quote
Kitchen	$32,000	$36,500	$38,200	+$4,500	+$1,700
Bathroom	$24,000	$22,800	$23,400	-$1,200	+$600
Services	$14,000	$19,500	$21,300	+$5,500	+$1,800

For instance, in this example, services were $7300 higher than the highest quote the calculator gave and the kitchen was $6200 more. If your quote is much higher than the calculator's maximum quote, ask what other items are in the quote that the calculator did not take into account. If your quote is much lower, ask what has been left out. Both of these things are very informative. Over a few jobs, it will show you how a particular market is different from the average.

Where a Free Renovation Cost Calculator Stops and FlipSync IQ Starts

Preliminary estimate. A calculator. Flip Sync IQ's deal analyzer runs the ARV with stepped maximum purchase prices and immediately back-solves you the maximum you can pay. Margin protection is still on, so a higher repair estimate eats into your purchase price before you close.

During building, the red/green budgeting variations are reported for each line item, with the three-number log and automated. Receipts, invoice, staged costs are entered against budgets. The pre-populated task list is a trade sequence, custom tasks provide approvals and lead time analysis, check-in history and date-stamped photo log captures person count and timing on the building site. The holding costs are against the calendar, ROI dashboard compares expected against actual results.

Ready to compare your calculator estimate with real invoices? Try FlipSync IQ free on your next renovation.

Free Renovation Cost Calculator Results: Set the Decision Rule First

Use any free renovation cost calculator for your rough budget estimate and consider the result as a range. Run the 5-minute process: scope, three numbers, contingency, finance, and allowance test. A renovation calculator that results in one figure hides the range, so seek one that produces low, medium, and high values.

Use second renovation calculator (loan) after you've passed your cap in the cost range. Then, make a note of the calculator, quote, invoice. Use your free Flip Sync IQ trial and compare your next free renovation cost calculator outcome to live transaction, remember a renovation calculator was just the first of three numbers you need.

Frequently Asked Questions

Is there a free renovation cost calculator for Australia? 

Yes. What's The Damage provides free calculators (no sign-up) with 15 city prices for kitchens, bathrooms, paint, tiling and other categories. Two major lenders have partnered with Core Logic: ING in 2019 and Suncorp in 2020, though I was unable to reach either to confirm availability.

How accurate is a renovation calculator? 

IING qualifies its quote as "an approximate guide only." What's The Damage says that its ranges are not. Use the calculator to make an initial assessment and get a written quote for a precise figure. 

What is the difference between a renovation cost calculator and a renovation loan calculator? 

The first estimates the cost of the work, the second estimates the cost of borrowing the money. Broking groups like Credit One offer modes for repayment and borrowing capacity. Both are important. 

How much is a $60,000 renovation loan per month? 

Over five years, a 5.90% interest rate will bring your monthly repayment amount to roughly $1,157 with $9,431 interest paid. Rates can differ from one lender to the next, so be sure to do a quote. 

Should I use the average renovation loan as my budget? 

No. Suncorp's estimate of $63,000 represents an average for borrowing for the 2019-20 financial year – you can read more about that on the page. Build your budget based on your own scope. 

What should I do when my quote exceeds the calculator's high figure? 

Ask the builder to give you a breakdown of the differences. Does the quote include fees, access charges or work that the calculator cant account for? Get two more quotes before you commit. 

How often do calculators update their prices? 

It depends. Core Logic says that Suncorp data was refreshed quarterly. What's The Damage has October 2026 listed on its calculator page. Check the date.