Build Your Granny Flat With Confidence — Not Guesswork
Free, builder-neutral guides for costs, regulations, and design across NSW, VIC, WA and QLD. Updated for 2026.
Find guides for your state
Choose your state to see regulations, approval pathways, and cost guides.
Everything you need to plan your build
Three content pillars — regulations, costs, and design — covering every stage of your project.
How much does a granny flat cost in 2026?
Australia-wide ranges — based on size, finishes, and build method. Click for full state breakdowns.
* Cost estimates are indicative only. Actual costs vary by location, site conditions, and builder. Always verify with your local council and a licensed builder.
See full cost breakdown by state →Design ideas for every room
Real Australian dimensions, cost bands and constraint-first ideas for compact spaces.
Latest guides — updated 2026
Recently published and updated articles across all four states.
Who we help
Granny Flat Guide is built for Australian homeowners at every stage of the planning process.
Independent, builder-neutral, and written by Australian planning researchers. Learn about this site →
Ready to get builder quotes?
Compare licensed builders in your area — free, no obligation quotes via our trusted partner network.