Granny flat rules
in New South Wales.
NSW has a statewide framework for secondary dwellings, which makes it more consistent than Queensland — but the detail still depends on your specific lot.
The short answer
NSW regulates secondary dwellings through the Housing SEPP, which sets a statewide framework rather than leaving it entirely to individual councils. A secondary dwelling can often be approved through a faster Complying Development Certificate (CDC) pathway if it meets set standards; if it does not, it goes through a standard Development Application (DA) with your council instead, which takes longer. Floor area caps and site rules can still vary by zone and by council overlay, so the framework narrows the questions rather than answering them for your specific block.
CDC versus DA, in plain terms
A Complying Development Certificate is a faster approval available when your proposal meets fixed, published standards exactly — size, setbacks, height and so on. If it does not meet every standard, or your land has a constraint the CDC pathway excludes, it goes to a standard Development Application through your council, assessed on merit and generally taking longer. Which pathway you qualify for is worth confirming before you finalise a design, not after.
What decides the numbers on your block
Minimum lot size, zone, and whether your land carries a flood, bushfire, heritage or environmental overlay all affect what a secondary dwelling can be and how it is approved. A figure that applies to a standard suburban lot is not automatically the figure that applies to yours.
One dwelling, one lot, no subdivision
A secondary dwelling sits on the same title as the principal dwelling and cannot be separately subdivided or sold off — it remains legally part of the one property, which is a constant across NSW rather than something that varies by council.
Renting it out
Recent reform has generally widened who a secondary dwelling can be let to, moving away from family-only restrictions in many cases — but confirm the current position for your specific approval before it becomes part of your financial plan for the project.
Building code and energy requirements still apply
A secondary dwelling must meet the National Construction Code regardless of the planning pathway, and current requirements generally call for a high minimum energy rating on new dwellings. Your building certifier or designer confirms what this means in practice for your build.
Last checked: 21 September 2026. General information, not planning or legal advice. Figures and pathways change — confirm current requirements on the NSW Planning Portal or with your council before you commit to a design.
Council rules for second dwellings
More in this series: Granny flat rules across Queensland · Granny flat rules in Rockhampton · Class 1a granny flats in Yeppoon · Isaac Regional: secondary dwellings · Mackay Regional: secondary dwellings · Whitsunday Regional: secondary dwellings · Renting out a granny flat in Rockhampton · Granny flat rules in Victoria · Ancillary dwelling rules in WA · Granny flat rules in SA · Secondary residence rules in Tasmania · Secondary residence rules in the ACT · Granny flat rules in the NT.
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Common questions
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Ask us directly →What are the granny flat rules in NSW?
Secondary dwellings are regulated under the Housing SEPP, with a Complying Development Certificate pathway available where standards are met exactly, and a standard Development Application otherwise. Site-specific factors such as zone and overlays affect the detail — confirm on the NSW Planning Portal or with your council.
How big can a granny flat be in NSW?
There is a commonly cited size cap, but it is worth confirming the current figure and any variations for your zone directly on the NSW Planning Portal rather than relying on a fixed number, since planning settings are periodically updated.
Can I rent out a secondary dwelling in NSW to anyone?
Recent changes have generally moved toward allowing rental beyond family members, but confirm the current rule for your specific approval before treating rental income as certain.
What is the difference between a CDC and a DA?
A CDC is a faster approval available when a proposal meets fixed published standards exactly. A DA is a standard council assessment used when a CDC pathway does not apply, and it generally takes longer.
Does a secondary dwelling in NSW need its own kitchen?
A self-contained secondary dwelling generally needs the facilities of an independent dwelling, including a proper kitchen rather than a kitchenette — confirm the requirement against your specific approval with your certifier.
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