Guide
Dual occupancy rules in NSW
Permissible almost everywhere in R2 since July 2024. Feasible on considerably fewer blocks than that.
What changed, and what didn't
Stage 1 of the low- and mid-rise reforms, from 1 July 2024, made dual occupancy permissible in Zone R2 across virtually the whole state. Councils that had excluded duplexes from R2 land, or set minimum lot sizes that made them impossible, were overridden on permissibility.
They were not overridden on everything. The minimum lot sizes and development standards still apply, and the LEP figure binds where it exceeds the code minimum. What changed is that the use is now permitted; what didn't change is that the numbers still have to work.
The three numbers that decide it
Lot width — 15 m at the building line. This is the standard that kills most duplex sites. The classic Sydney 40-foot frontage is 12.19 m, and a 14.6 m lot is as ineligible as a 10 m one. It is the first thing to check and it takes seconds.
Lot area — 400 m², or the LEP minimum if greater. LEP minimums for dual occupancy commonly sit at 450–600 m², and where they do, the LEP figure is the one that binds.
Floor area — 25% of the lot plus 150 m², capped at 400 m². Across both dwellings. The cap means a large block stops buying floor area above about 1,000 m², which surprises people who assume a bigger lot means bigger houses.
Height is 8.5 m. Front setback is the average of the two nearest residential buildings within 40 m on the same side of the road, so the street decides it. Side and rear setbacks are table-based with a height formula on top.
Subdivision is usually the point
Two dwellings on one title is a rental proposition. Two dwellings on two titles is a different asset, and the gap between those two valuations is normally what makes a duplex worth building at all.
The provision that makes it possible on ordinary blocks is a clause in most LEPs that disapplies the minimum subdivision lot size for a dual occupancy split in R2, R3 and R4 where each dwelling ends up on its own lot. Where it applies, a duplex on 600–700 m² can become two lots of around 300–350 m² — well under the zone's stated minimum.
It is not universal, and some councils have gazetted changes that blunt it. Confirming it in your LEP before anything else is the single highest-value check in a duplex feasibility, and a feasibility that assumes it without checking is not a feasibility.
Where to go next
- Dual occupancy design and approval — the standards in full, and the two complying development routes
- Subdivision — how the split actually works, and what the surveyor costs
- The low- and mid-rise reforms — what else the reforms unlocked, and where
- What a duplex costs to build — note the development contributions line, which is charged per dwelling
Common questions
Can I build a duplex in R2 zoning?
Generally yes. Since 1 July 2024, Chapter 6 of the Housing SEPP has made dual occupancy permissible in Zone R2 Low Density Residential across virtually the whole state, overriding councils that had excluded it. Permissibility is not the same as feasibility — the standards still have to be met.
Does a duplex need to be near a station or a town centre?
No. That is the most commonly confused point in NSW planning right now. Dual occupancy in R2 is state-wide. It is terraces, manor houses, multi-dwelling housing, residential flat buildings and shop-top housing that need the site to be inside a low and mid-rise catchment.
How wide does my block need to be?
For the complying development route, at least 15 m at the building line. A great many Sydney lots are 12.19 m — the old 40-foot frontage — and those do not qualify no matter how good the design is. They can still go to a development application.
How much floor area do I get?
25% of the lot area plus 150 m², capped at 400 m² across both dwellings. On a 700 m² lot that is 325 m² total, or roughly 160 m² each once garages are allowed for.
Can I subdivide a duplex?
Often, and it is usually the reason to build one. LEP clause 4.1(3C) commonly disapplies the minimum subdivision lot size where a dual occupancy is being split with one dwelling on each lot in R2, R3 or R4 — which is why a duplex on 600–700 m² can frequently split into two lots of around 300–350 m². It has to be confirmed in your council’s LEP; it is not universal.
What if one dwelling sits above the other?
Then it is assessed against manor house standards rather than dual occupancy standards. A different set of rules for what can look like a similar building.
General information about NSW planning, current at September 2026. Not advice on a particular site — the instruments are amended often and councils vary them locally.
Will a duplex work on your block?
Send us the address. Lot width is usually the answer and it takes minutes to check.