Granny Flat Regulations Australia 2026 State-by-State Comparison
Are granny flat rules the same in every Australian state? For granny flat regulations australia, No. Each state sets its own maximum size, setback standards and approval pathway. New South Wales uses Housing SEPP CDC rules at 60 m², Queensland allows up to 80 m² GFA in many metro areas, and Western Australia references ancillary dwellings under the R-Codes.
Use the interactive rules by state hub for the full comparison table with official .gov.au links. This article explains how the major states differ and where to read primary law.
National comparison at a glance
| State | Typical max size | Fast-track pathway | Official source | Our guide |
|---|---|---|---|---|
| NSW | 60 m² internal | CDC via Housing SEPP | NSW Planning Portal | NSW CDC vs DA |
| VIC | 60 m² typical | Part 5 / VicSmart | planning.vic.gov.au | VIC rules |
| QLD | 80 m² GFA metro | Accepted development | planning.qld.gov.au | QLD rules |
| WA | ~70 m² (R-Codes) | Deemed-to-comply / approval | WA DPLH | WA guide |
| SA | 60 m² typical | Code / DA | PlanSA | SA guide |
| TAS | Up to 90 m² some zones | Permit / exempt | planning.tas.gov.au | TAS guide |
Confirm setbacks, fees and supplier inclusions with your council or certifier before you sign. SEPP, CDC and DA pathways differ by state, lot size and overlays such as heritage or flood. Use our planning tools for ballpark figures, then verify with a private certifier or council planner when your design is settled.
How approval pathways differ
New South Wales separates Complying Development (CDC) from Development Application (DA) under the Housing SEPP. A CDC through a private certifier is commonly the fastest route when every standard is met (NSW complying development).
Victoria uses the Victoria Planning Provisions and local schedules. Small second dwellings can qualify for streamlined assessment when they meet preset standards (VIC small second dwelling guide).
Queensland distinguishes accepted development from assessable development under the Planning Act 2016 (QLD planning).
Confirm setbacks, fees and supplier inclusions with your council or certifier before you sign. SEPP, CDC and DA pathways differ by state, lot size and overlays such as heritage or flood. Use our planning tools for ballpark figures, then verify with a private certifier or council planner when your design is settled.
Planning tools before you lodge
- Approval pathway wizard – CDC vs DA likelihood by state
- Setback checker – size and setback screen
- Cost calculator – budget preliminaries including council fees
- Cost breakdown by line item
- ATO granny flat agreement – family funding and CGT
Confirm setbacks, fees and supplier inclusions with your council or certifier before you sign. SEPP, CDC and DA pathways differ by state, lot size and overlays such as heritage or flood. Use our planning tools for ballpark figures, then verify with a private certifier or council planner when your design is settled.
Frequently Asked Questions
Which state has the largest granny flat size limit?
Tasmania can allow larger ancillary dwellings in some zones (up to about 90 m²). Queensland metro commonly allows 80 m² GFA. NSW and Victoria commonly use 60 m² internal for fast-track pathways.
Can I use one national floor plan everywhere?
Rarely. Setbacks, height, parking and utility connections vary by council overlay. Always adapt drawings to your lot report before you order a kit.
What else should I verify locally?
Check flood, bushfire and airport noise overlays on your title before you order a kit. Council pre-lodgement meetings are often free and catch show-stoppers early.
How much does council approval add to your granny flat budget?
Council and certifier fees sit outside the builder quote. In NSW, a CDC pathway through a private certifier often lands between roughly $3,000 and $8,000 once survey, BASIX and Sydney Water checks are included, while a full DA can cost more because of longer consultant time and holding costs. Victoria and Queensland use different fee schedules, so treat any single number as a starting point. Model your own project in our granny flat cost calculator, then compare supplier quotes through get a quote when your footprint is settled.
What design choices affect approval speed?
Setbacks, height, floor area and tree protection overlays decide whether you stay on a fast CDC track or drop to a slower DA. Staying under common 60 sqm internal caps, keeping adequate side and rear setbacks and connecting services without major easement conflicts usually keeps the pathway simpler. If your block is sloped, flood-affected or heritage-listed, expect extra reports before council or your certifier can sign off. Use the setback checker and approval wizard against your address before you pay for custom drawings.
Primary sources
The Granny Flat Guide cross-checks regulation and cost summaries against official Australian references. Verify current rules with these sources before you lodge an application or sign a contract.
- Your Home (Australian Government)
- NSW Planning Portal
- Victorian Building Authority
- Queensland Planning
- WA Planning (DPLH)
- PlanSA (South Australia)
Related guides
