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Duplex builders in the Sutherland Shire
A duplex in delivery at Caringbah, a straight answer on what your block may allow, and a free written site assessment within two business days.
Sutherland Shire
Building a duplex in Sutherland Shire
Our Caringbah duplex is the kind of job the Shire produces: a large, level block in an established street, an original house at the end of its life, and owners who want to keep one home and sell or rent the other.
Outside the State's mapped areas, the council's rule decides most Shire sites. A dual occupancy in the R2 zone needs a lot of at least 600 square metres, and the LEP has no single frontage minimum for a DA. The State's Low and Mid-Rise Housing Policy names Caringbah, Cronulla, Engadine, Gymea, Kirrawee, Menai Marketplace, Miranda, Southgate, Sutherland and Woolooware. On eligible land within 800 metres' walk of one of those, a block of 450 square metres that is 12 metres wide may satisfy the State's duplex DA standards. The walk is measured along a safe public route from the station entrance or the centre's mapped edge, so being in the same suburb is not enough.
Complying development needs 600 square metres here, because the Code uses the council's minimum where it is higher than 400, and normally 15 metres at the building line. A second driveway crossing is a separate question: council guidance says it will only be considered where the frontage is more than 20 metres. Specified high-risk flood land in the Georges River catchment is excluded from the State policy, so the flood layers are among the first things we check.
Sutherland Shire Council's average DA assessment time was 97 days in the NSW council league table for June 2026.
Suburbs we cover include Caringbah, Caringbah South, Miranda, Gymea, Gymea Bay, Kirrawee, Sutherland, Sylvania, Engadine, Cronulla, Woolooware, Menai, Bangor, Kareela, Jannali, Como and Oyster Bay.
At a glance
- Where duplexes are permitted
- With consent in the R2 zone, as across NSW since July 2024
- Council minimum lot
- 600 square metres in R2, with no single local DA frontage minimum
- Low and Mid-Rise Housing areas
- Within 800 metres' walk of Caringbah, Cronulla, Engadine, Gymea, Kirrawee, Menai Marketplace, Miranda, Southgate, Sutherland or Woolooware. On eligible land, 450 square metres and 12 metres may satisfy the State's duplex DA standards
- Complying development
- At least 600 square metres and normally 15 metres at the building line, or 12 metres where parking is reached only from a secondary road, parallel road or lane
- Second driveway
- Only considered where the frontage is more than 20 metres, under current council guidance
- Two titles
- A separate approval from building the two homes. We check Torrens or strata for your address
- Council assessment time
- Average 97 days, NSW council league table, June 2026
The State rules
How the State rules sit beside the council's
The rules come in layers, and they are easy to mix up. The first question is whether a duplex is permitted at all. Since 1 July 2024 dual occupancies have been permitted with consent in the R2 zone across NSW, and a council's LEP can permit them in other zones. That settles the land use only. It does not mean a particular block is big enough, wide enough or free of constraints.
Outside the State's mapped areas, the council's own minimum lot size and frontage apply to a development application. Since February 2025 the State's Low and Mid-Rise Housing Policy has added a second test. On eligible land within 800 metres' walking distance of a nominated station entrance or the mapped edge of a nominated town centre, a council cannot refuse a duplex DA for lot size or width if the block is at least 450 square metres and 12 metres wide at the front building line, with a floor space ratio up to 0.65:1, a height up to 9.5 metres and one parking space per home. The rest of the controls and the merits of the design still apply, so it is not automatic approval. The walk is measured along a safe public route, so the policy never covers a whole suburb. It does not apply inside transport oriented development areas, or on excluded land such as bushfire prone land, specified high-risk flood land, heritage items, high aircraft-noise land, coastal wetland and vulnerability areas, and land within 200 metres of specified dangerous-goods pipelines.
Complying development is a separate test again. Under the Low-Rise Housing Diversity Code the lot must be at least 400 square metres or the council's own duplex minimum, whichever is greater, and normally 15 metres wide at the building line, or 12 metres where parking is reached only from a secondary road, parallel road or lane. A block can fail complying development and still suit a DA, or meet the State's DA standards without qualifying for complying development. Separate titles are a separate approval as well.
Custom homes too
Not every block wants a duplex
The same site assessment tells you whether a single custom home or a knock down rebuild is the better use of the block. We build both, and we would rather say so early than push a duplex onto a site that suits one good home.
Projects nearby
Work in Sutherland Shire
Our Caringbah duplex is in delivery. The Ryde home is the next closest project.
How it runs
How a project runs
Test the site
Planning, frontage, access, services and the likely approval path, checked before design is fixed.
Set the brief and budget
Agree what matters, where to spend and what the project needs to achieve.
Design and price together
Architecture, engineering, selections and trade pricing move together, so the price is known before the contract.
Build from a settled scope
One program and one site team, with a weekly update and variations priced and signed before the work.
Common questions about duplexes in Sutherland Shire
Is 550 square metres enough for a duplex in the Sutherland Shire?
Not under the council's own controls, which ask for 600 square metres in R2. If the block is on eligible land within 800 metres' walk of one of the ten nominated centres, and at least 450 square metres and 12 metres wide, it may satisfy the State's duplex DA standards instead. That depends on the mapping, the walking route and the exclusions, so we check the address before saying either way.
Can my Shire duplex go through CDC instead of a DA?
Only if the block and the design meet every standard in the Low-Rise Housing Diversity Code. In the Shire that means at least 600 square metres and normally 15 metres at the building line, or 12 metres where parking is reached only from a secondary road, parallel road or lane, and none of the Code's exclusions. A block that fails the Code can still be a good DA site.
Can I have two driveways?
Not automatically. Council guidance says a second vehicle crossing will only be considered where the frontage is more than 20 metres. On narrower blocks the design usually shares one crossing, and we plan for that from the first sketch.
Can I get two separate titles?
Subdivision is its own approval, separate from approval to build the two homes. Whether Torrens or strata is available depends on the lot and the controls that apply to it, so we check it for your address rather than promise it.
Planning facts on this page were checked on 29 September 2026 against the Sutherland Shire Local Environmental Plan 2015, Council's dual occupancy and low and mid-rise housing guidance, the Housing SEPP, the Codes SEPP and the NSW Low and Mid-Rise Housing Policy. They are a guide, not a guarantee for any property. Controls change and exclusions apply, so we confirm them for your address as part of the free site assessment. This page is general information, not planning advice or an approval.
Tell us the address of your block in Sutherland Shire.
Send the address and what you want to build. Within two business days you will have a written site assessment and a clear next step.