Grantham Farm flood map & planning overlays
A planning-constraint profile of Grantham Farm (Blacktown, NSW) - 3.61 km², mapped from live council and state overlay data. This suburb is highly constrained.
Everything below is suburb-wide. Overlays change block to block - see which ones actually touch your lot. The map is free.
Constraint readout
3.61 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Grantham Farm's boundary, with the flood, bushfire and environmental overlays drawn on top. It shows where constraints fall; the interactive map shows them on your exact address.
Grantham Farm at a glance
How Grantham Farm is zoned
Buying in Grantham Farm? The zoning, flood and bushfire lines on the section 10.7 certificate attached to the contract are mapped controls - see our s10.7 certificate guide.
Across its 3.61 km², Grantham Farm is highly constrained by planning overlays. About 8% of the suburb sits within a mapped flood overlay, and 47% is flagged bushfire-prone. There are 3 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 502 m² across 3,994 parcels. These figures are suburb-wide - the overlays that actually apply to a given lot can differ block to block, which is what a property-level check tells you.
Who lives in Grantham Farm
Census 2021 figures published by the ABS for the Grantham Farm suburb boundary itself, not a wider region.
Socio-economic standing
ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.
Score 1111, and decile 10 within New South Wales. The national average is 1000.
Age profile
Share of Grantham Farm's 3,669 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Riverstone, the wider ABS statistical area containing Grantham Farm. There is no annual population series published at suburb level, so this describes the surrounding area rather than Grantham Farm itself.
7,294 in 2001 to 20,068 in 2025, up 175%.
Source: Australian Bureau of Statistics. Census of Population and Housing 2021 (General Community Profile) and SEIFA 2021, both published at the Suburbs and Localities level; Regional Population (estimated resident population) at Statistical Area Level 2. Used under CC BY 4.0. Census counts of small populations are randomly adjusted by the ABS to protect confidentiality, so figures for small suburbs are indicative.
Grantham Farm data sources and coverage
Every figure below is an aggregate for the suburb boundary. “Not mapped” means LayeredGeo does not hold a source layer covering this suburb; it is never an all-clear for a particular property.
| Dataset | Coverage | Publisher |
|---|---|---|
| Flood mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Bushfire-prone mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Zoning | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Heritage and environment | Mapped where published | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 5 August 2026. See the methodology and full source list. Source data changes over time and critical decisions should be checked with the responsible authority.
Check a specific Grantham Farm address
See exactly which overlays touch a single property - the interactive map is free. Need it on paper? A full planning PDF is just $9.
See what's in the $9 report →Grantham Farm planning - frequently asked
Where can I see a flood map of Grantham Farm?
The schematic on this page is a Grantham Farm flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 8% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any Grantham Farm address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.
Is Grantham Farm flood-prone?
About 8% of Grantham Farm falls within a mapped flood overlay, against the council-wide suburb average of 7%. Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.
Is Grantham Farm bushfire-prone?
Yes - around 47% of Grantham Farm is mapped as bushfire-prone, compared with a Blacktown average of 21%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.
What is the zoning in Grantham Farm?
The dominant planning zone in Grantham Farm is Low Density Residential, though the suburb also includes Infrastructure and Environmental Conservation. Zoning sets what you can build and do on a site, and can differ lot by lot.
Does Grantham Farm have heritage-listed places?
Grantham Farm has 3 heritage-listed places on record. Heritage listing affects what you can alter or demolish, so confirm whether a specific property is listed or near a heritage place.
What is the typical lot size in Grantham Farm?
Across 3,994 surveyed parcels in Grantham Farm, the median lot size is about 502 m². There are also 11 registered easements mapped in the suburb - an easement can restrict where you can build, so always check the title and overlays for the specific lot.
Does Grantham Farm have a train station?
There is no train station inside Grantham Farm itself. The suburb is served by 32 bus stops.
What is the population of Grantham Farm?
At the 2021 Census Grantham Farm had 3,669 usual residents, with a median age of 30 and an average household size of 3.2 people. The wider Riverstone statistical area, which contains Grantham Farm, went from 7,294 people in 2001 to 20,068 in 2025, up 175%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Grantham Farm alone.
Is Grantham Farm an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Grantham Farm scores 1111 and sits in decile 10 of 10 nationally and decile 10 within New South Wales - decile 1 being the most disadvantaged tenth of Australian suburbs and decile 10 the least. The national average score is 1000. SEIFA summarises income, education, occupation and housing across the whole suburb, so it describes the area, not any particular household in it.
What is the median household income in Grantham Farm?
Median household income in Grantham Farm was $2,570 a week at the 2021 Census, against $2,117 for the typical suburb in Blacktown. Median rent was $540 a week and the median mortgage repayment $2,700 a month. These are 2021 Census figures and have not been indexed to today.
Do I need a planning report for a Grantham Farm property?
A Grantham Farm planning report pulls every overlay - zoning, flood, bushfire, heritage and environmental - that touches a single lot, on live council and state data. The interactive map preview is free; a full PDF report is $9.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Riverstone | 1.4 km | 18% | 11% |
| Box Hill The Hills Shire |
1.9 km | 20% | 18% |
| Richards | 2.2 km | 65% | 73% |
| Vineyard Hawkesbury |
3.1 km | 40% | 88% |
| Rouse Hill | 3.2 km | 4% | 50% |
| Tallawong | 3.3 km | 11% | 29% |
| Schofields | 4.2 km | 33% | 28% |
| Angus | 4.3 km | 47% | 90% |
| Oakville Hawkesbury |
4.4 km | <1% | 95% |
| Nelson The Hills Shire |
4.8 km | 0% | 100% |