Before you buy a Penrith block for a duplex or a granny flat, check five things: the zone and minimum lot size under Penrith LEP 2010, the frontage and design controls in Penrith DCP 2014, the flood planning area (a large share of Penrith is affected by the Hawkesbury-Nepean or a local creek), bushfire prone land on the rural edges, and whether the lot sits inside a low and mid-rise housing catchment around Penrith, Kingswood, Werrington, St Marys or Emu Plains stations. Granny flats are simpler because the Housing SEPP sets the rules statewide, but the flood and bushfire checks apply to them just as much.
Key takeaways
- Penrith LEP 2010 sets the minimum lot size for a dual occupancy and whether it can be subdivided; Penrith DCP 2014 sets the frontage, setback, landscaping and parking controls.
- A secondary dwelling (granny flat) is governed by Chapter 3 of the Housing SEPP, with a maximum floor area of 60 square metres or the percentage the LEP allows, whichever is greater.
- Dual occupancies have been permissible in every R2 zone in NSW since 1 July 2024, and State non-refusal standards have applied since 28 February 2025 within 800 metres of nominated Penrith stations and centres.
- Flood-affected lots along the Nepean, South Creek, Ropes Creek and the Penrith Lakes edge lose the complying development option and may need raised floor levels.
- Airport noise contours from Western Sydney International affect Luddenham, Orchard Hills, Mulgoa and Wallacia and can restrict residential density.
Check 1: zone and lot size under Penrith LEP 2010
Most of Penrith’s suburban land (Penrith, Kingswood, Cambridge Park, Cambridge Gardens, Werrington, Werrington County, St Marys, North St Marys, Oxley Park, Colyton, St Clair, Erskine Park, South Penrith, Jamisontown, Glenmore Park, Emu Plains, Leonay, Cranebrook, Jordan Springs, Claremont Meadows, Caddens) is zoned R2 Low Density Residential, with R3 and R4 around the Penrith and St Marys centres. Dual occupancies are permissible in R2 under the LEP and, since 1 July 2024, in every R2 zone in NSW under Stage 1 of the State’s Low and Mid-Rise Housing policy. The lot then has to meet:
- The LEP minimum lot size for a dual occupancy, shown on the lot size map and in the relevant clause. Check the current figure; it varies within the LGA.
- The LEP test for Torrens subdivision of the duplex, which requires each resulting lot to reach a minimum area. Where it cannot be met, strata subdivision is the fallback.
Since 28 February 2025, Stage 2 of the Low and Mid-Rise Housing policy has applied within 800 metres walking distance of nominated stations and centres, and Penrith, Kingswood, Werrington, St Marys and Emu Plains are in scope. Inside those catchments a dual occupancy can rely on State non-refusal standards for lot size, height, FSR and setbacks, and terraces, townhouses and manor houses are permissible in R2. The catchment excludes flood and bushfire affected land and heritage conservation areas, which in Penrith removes more sites than people expect.
Check 2: the Penrith DCP 2014 controls for a duplex
Penrith DCP 2014 sets the residential design controls, and on dual occupancy DAs across Penrith the ones that most often need attention are:
| Control | What it means for a Penrith duplex |
|---|---|
| Minimum frontage | A minimum width for attached and detached dual occupancies and a separate rule for battle-axe lots. Narrow 1970s lots in Cambridge Park and Kingswood often fail here. |
| Garage width and setback | Garages limited as a share of the facade and set behind the front wall. Single garages with a tandem space are the usual compliant answer. |
| Landscaped area | A minimum proportion of the site, with a share in the front setback. The second driveway is what pushes landscaping below the target. |
| Private open space | A minimum area and dimension per dwelling directly off a living room, with solar access. |
| Parking and access | Spaces per dwelling with driveway widths and gradients to AS 2890.1:2004, and limits on crossings per frontage. |
| Cut, fill and stormwater | Limits on fill (especially on flood-affected land), on-site detention, and a legal point of discharge. Rear lots draining away from the street need an easement. |
A dual occupancy planning check against these controls before purchase tells you whether the lot works before you pay for a design.
Check 3: granny flats under the Housing SEPP
Secondary dwellings are governed by Chapter 3 of State Environmental Planning Policy (Housing) 2021, which the Department summarises on its Housing SEPP page. The rules that matter in Penrith:
- A secondary dwelling is permissible on residential zoned land where a house is permissible, regardless of the LEP land use table.
- Maximum floor area is 60 square metres or the percentage of the principal dwelling’s floor area the LEP allows, whichever is greater.
- Only one secondary dwelling per lot, and it cannot be subdivided from the principal dwelling.
- Complying development is available under the Housing Code for an attached granny flat and under the Housing SEPP’s complying development provisions for detached ones, subject to a minimum lot size, setbacks and the usual exclusions for flood control lots, bushfire prone land and heritage.
- Where complying development is not available, a DA under Penrith LEP 2010 and DCP 2014 applies, and the DCP’s setback, open space and parking controls come into play.
The common Penrith mistake is buying a flood-affected lot in Emu Plains, Penrith or Londonderry assuming a granny flat is a quick certifier approval. On a flood control lot it is a DA, with a flood assessment and a floor level that may sit well above the yard. Our granny flat planning service sorts the pathway before you commit.
Check 4: flood and bushfire
Penrith carries more flood-affected residential land than almost any Sydney council. The Hawkesbury-Nepean floodplain covers Emu Plains, Leonay, parts of Penrith and Jamisontown, and the rural land at Londonderry, Llandilo, Berkshire Park and Castlereagh; South Creek, Ropes Creek, Werrington Creek and Byrnes Creek add local flooding through St Marys, Werrington, Colyton, Oxley Park and Claremont Meadows. On a flood-affected lot:
- The s10.7(2) certificate will identify flood-related development controls.
- Complying development is generally unavailable for a duplex or granny flat.
- The DA needs a flood assessment addressing floor levels, flood-compatible construction, fill and evacuation under SEPP (Resilience and Hazards) 2021 and the LEP flood clause.
- Council may not support a second dwelling at all in high hazard areas.
Bushfire prone land runs along the rural edges at Cranebrook, Llandilo, Londonderry, Castlereagh, Mulgoa, Wallacia and Orchard Hills. A duplex or granny flat there needs a Bushfire Assessment Report to Planning for Bush Fire Protection 2019, and the NSW RFS guidance sets out the BAL and Asset Protection Zone requirements.
Check 5: the airport and the Aerotropolis edge
Western Sydney International Airport at Badgerys Creek and the Sydney Metro Western Sydney Airport line from St Marys through Orchard Hills and Luddenham to Bradfield have changed the southern half of the LGA. Two things to check on land in Luddenham, Orchard Hills, Mulgoa, Wallacia, Kemps Creek and Badgerys Creek:
- Aircraft noise contours. The airport’s noise exposure mapping restricts new residential development in the higher contours and requires acoustic construction in others. The Department’s Western Sydney Aerotropolis page links to the current mapping.
- Aerotropolis and precinct zoning. Land inside the Aerotropolis precincts is under SEPP (Precincts, Western Parkland City) 2021, not Penrith LEP 2010, and residential dual occupancies are generally not the intended outcome.
An address that says Penrith does not always mean Penrith LEP 2010 applies, and a development due diligence report answers that question before contracts are exchanged.
Frequently asked questions
What size block do I need for a duplex in Penrith?
Penrith LEP 2010 sets the minimum lot size for a dual occupancy on its lot size map and in the relevant clause, and Penrith DCP 2014 adds a minimum frontage. Both vary within the LGA, and Torrens subdivision needs a larger lot again. Check the current figures for your street, or the State standards if the lot is inside a station catchment.
Can I build a granny flat in Penrith as complying development?
Yes, on most unconstrained residential lots that meet the minimum lot size, under the Housing SEPP’s complying development provisions or the Housing Code for an attached granny flat. Flood control lots, bushfire prone land and heritage items are excluded and need a DA.
Is Emu Plains flood affected?
Much of Emu Plains and Leonay is within the Hawkesbury-Nepean flood planning area. A duplex or granny flat there is a DA with a flood assessment, and the floor level and evacuation requirements can affect whether a second dwelling is supportable.
URBA prepares due diligence reports, Statements of Environmental Effects and pathway advice for duplexes and granny flats across Penrith, and we run the flood, bushfire and airport checks before you buy. See our Penrith town planning page for how we work with council, or request a fee proposal for your lot.