Rough Cost Range
We look at the bedroom option, size and site conditions that may affect the budget.
Cost & ROI / Free ROI Estimate
Get a Free Granny Flat ROI Estimate
Send us your address and goal. We will check the main cost, rent and site factors before design or quoting.
What you receive
What We Check Before Your ROI Estimate
Send us your address and what you want to build. We will check the main cost, rent and site issues first.
Possible Weekly Rent
We check the bedroom option and suburb to give you a realistic rent starting point.
Simple ROI View
We compare rough cost and rent so you can see if it is worth checking further.
Clear Next Step
We tell you whether to check the land, compare designs or request pricing.
Request your estimate
Details We Need to Estimate Your ROI
A few details make the estimate more useful for your land, bedroom choice and rental goal.
Address
Helps us review site and local rent factors.
Bedroom Option
Tell us if you are considering 1, 2 or 3 bedrooms.
Goal
Share your budget, rent target or intended use.
Useful details
A property address, bedroom option and rough goal help us make the first review more site-based.
Request My Free ROI Estimate
Start with the required details. Optional numbers can help, but they are not required for the first review.
What we check
Small site details can change cost and rent assumptions.
Access
Services
Site works
Reports
Local rent
Privacy
Site factors
What Can Change the Estimate?
The same bedroom count can produce different numbers when the site, services and local rent demand are different.
Site Works
Slope, drainage and ground conditions may change cost.
Access
Tight access or delivery limits can affect planning.
Services
Longer service runs or upgrades may change the estimate.
Permits / Reports
Extra reports or controls may add time and cost.
Local Rent
Suburb demand and timing can change rent assumptions.
Privacy & Layout
Parking, privacy and floor plan can affect rental appeal.
Site-based review
Why We Review the Site First
ROI only makes sense when the land, access, services and approval pathway are worth checking.
Victoria-Focused
We look at local small second dwelling factors.
Site-Based
Your layout, access and services matter before design starts.
Clear Next Step
Know whether to check land, compare designs or request pricing.
Calculator FAQ
ROI Calculator Questions
Quick answers before you rely on the numbers.
Use these answers to check your inputs, then submit your address if you want a more realistic ROI direction.
How do I calculate granny flat ROI?
Start with the expected weekly rent, then allow for vacancy and yearly costs. Compare the estimated net return with the project cost. This gives you a rough ROI direction, not a guaranteed return.
What cost should I enter?
Use the expected full project cost, not just a package price. Site works, service connections, permits, reports and upgrades can all change the final cost.
Should I include vacancy?
Yes. Even a good rental area can have gaps between tenants. Using an occupancy allowance gives a more realistic result than assuming rent is paid every week.
What expenses should I include?
Allow for property management, insurance, maintenance and other holding costs. The exact amount depends on how the granny flat is managed and rented.
Is the return guaranteed?
No. Rent and ROI can change with suburb demand, market timing, layout, privacy, parking and ongoing costs. Use the result as a starting point only.
Why check my land after calculating?
Because the calculator cannot see your block. Access, slope, services, overlays, easements and site works may change the cost and the next step.
Ready to Check Your Granny Flat ROI?
Send your address. We’ll review the main cost, rent and site factors first.