Castle Hill flood map & planning overlays
A planning-constraint profile of Castle Hill (The Hills Shire, NSW) - 18.88 km², mapped from live council and state overlay data. This suburb is moderately constrained.
Everything below is suburb-wide. Overlays change block to block - see which ones actually touch your lot. The map is free.
Constraint readout
18.88 km² - this suburb is moderately constrained by planning overlays.
Elevation hillshade with street names, clipped to Castle Hill'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.
Castle Hill at a glance
How Castle Hill is zoned
Buying in Castle Hill? 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 18.88 km², Castle Hill is moderately constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 19% is flagged bushfire-prone. There are 37 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 804 m² across 11,199 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 Castle Hill
Census 2021 figures published by the ABS for the Castle Hill 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 1124, and decile 10 within New South Wales. The national average is 1000.
Age profile
Share of Castle Hill's 40,874 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Castle Hill - North, the wider ABS statistical area containing Castle Hill. There is no annual population series published at suburb level, so this describes the surrounding area rather than Castle Hill itself.
11,141 in 2001 to 12,973 in 2025, up 16%.
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.
Castle Hill 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 Castle Hill 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 →Castle Hill planning - frequently asked
Where can I see a flood map of Castle Hill?
The schematic on this page is a Castle Hill flood map: the mapped flood overlays drawn over the suburb's terrain and street grid. Flood lines vary block to block, so for a specific property use the free interactive map - search any Castle Hill address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.
Is Castle Hill flood-prone?
Flood mapping covers Castle Hill and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 1%). Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.
Is Castle Hill bushfire-prone?
Yes - around 19% of Castle Hill is mapped as bushfire-prone, compared with a The Hills Shire average of 62%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.
What is the zoning in Castle Hill?
The dominant planning zone in Castle Hill is Low Density Residential, though the suburb also includes Public Recreation and Medium Density Residential. Zoning sets what you can build and do on a site, and can differ lot by lot.
Does Castle Hill have heritage-listed places?
Castle Hill has 37 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 Castle Hill?
Across 11,199 surveyed parcels in Castle Hill, the median lot size is about 804 m². There are also 54 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 Castle Hill have a train station?
Yes - Castle Hill has 2 train stations: Castle Hill Station, Hills Showground Station. It is also served by 501 bus stops.
What is the population of Castle Hill?
At the 2021 Census Castle Hill had 40,874 usual residents, with a median age of 42 and an average household size of 3.0 people. The wider Castle Hill - North statistical area, which contains Castle Hill, went from 11,141 people in 2001 to 12,973 in 2025, up 16%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Castle Hill alone.
Is Castle Hill an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Castle Hill scores 1124 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 Castle Hill?
Median household income in Castle Hill was $2,551 a week at the 2021 Census, against $2,650 for the typical suburb in The Hills Shire. Median rent was $560 a week and the median mortgage repayment $3,000 a month. These are 2021 Census figures and have not been indexed to today.
Do I need a planning report for a Castle Hill property?
A Castle Hill 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 |
|---|---|---|---|
| Baulkham Hills | 3.0 km | 0% | 13% |
| Glenhaven | 3.1 km | 0% | 72% |
| Norwest | 3.2 km | 0% | 0% |
| West Pennant Hills | 3.7 km | 0% | 37% |
| Bella Vista | 4.1 km | 0% | 0% |
| Cherrybrook Hornsby |
4.3 km | 0% | 40% |
| Kellyville | 4.5 km | 0% | 9% |
| North Rocks City Of Parramatta |
5.3 km | 0% | 48% |
| Winston Hills City Of Parramatta |
5.5 km | 0% | 9% |
| Northmead City Of Parramatta |
6.0 km | 0% | 22% |