Castle Hill is a large suburb of about 40,900 people in NSW’s The Hills Shire, a mix of houses and units. With a median weekly rent of $560 and family-sized households averaging 3.0 people, this page brings together verified ABS Census measures to help you gauge the local market and where Castle Hill blocks may hold value. Then audit a specific block to see its exact value and development potential.
Source: ABS Census 2021 · Reference: August 2021 · Suburb-level
We don't publish current Castle Hill sale prices yet. Individual sale records are not published here. Figures shown are suburb-level medians from ABS/Census sources — audit an exact address for property-specific analysis. The figures above are ABS Census measures; for a current, address-specific estimate and value-add scenarios, audit the exact property.
Source: OpenStreetMap · as of August 2026 · indicative, counted within the suburb boundary
General value-add directions — none of these imply approval for any specific site. Exact feasibility depends on the block and its planning controls.
Refresh kitchens, bathrooms and finishes to lift value without structural change.
Audit your addressAdd living space upward where the existing dwelling and site allow.
Audit your addressTwo dwellings on one lot can be viable on suitable blocks under the right controls.
Audit your addressLarger or wider lots may support subdivision, subject to minimum-lot rules.
Audit your addressReplacing an older dwelling can unlock a site’s full potential.
Audit your addressA general guide from the zoning below — exact controls vary by address, instrument and proposal. Audit an exact Castle Hill address →
Castle Hill's residential land is zoned R3 Medium Density Residential, R1 General Residential, R2 Low Density Residential, R4 High Density Residential — the starting point for what can be built, before address-level controls.
Planning instrument: Hornsby Local Environmental Plan 2013; The Hills Local Environmental Plan 2019.
NSW's low- and mid-rise housing reforms are progressively lifting what's permissible near centres and transport across the state, so a Castle Hill site's potential today can differ from its history. Exact controls — zone, height, floor-space ratio, minimum lot size, heritage and any coastal or environmental overlays — vary by address, planning instrument, site and proposal. Confirm them for a specific site.
Zoning source: NSW ePlanning (EPI Primary Planning Layers) · as of August 2026. General and qualified — verify controls for any specific address.
Often, yes — on a qualifying lot. Castle Hill's residential land is zoned R3, R1, R2, R4, where dual occupancy is generally permissible on sites that meet the minimum lot size and other controls under Hornsby Local Environmental Plan 2013; The Hills Local Environmental Plan 2019. Whether a specific block qualifies depends on its size, shape and frontage — audit an exact Castle Hill address to confirm.
Usually, yes — on a suitable residential lot. A secondary dwelling (granny flat) is generally permitted on residential lots in Castle Hill that meet the NSW housing SEPP criteria for lot size and setbacks. Audit your Castle Hill address to check feasibility for the exact site.
Sometimes — it depends on your block. Subdivision in Castle Hill is governed by the minimum lot size for the zone under Hornsby Local Environmental Plan 2013; The Hills Local Environmental Plan 2019; larger or wider lots have the most potential. Audit an exact address to see whether subdivision is on the table.
Castle Hill's residential land is primarily zoned R3 Medium Density Residential, which allows medium-density housing — townhouses, villas, terraces and manor homes. Exact controls vary by address — audit a specific Castle Hill block for what it can become.
We don't publish current sale prices on this page yet — the figures shown are measured ABS Census medians, not live sale data. For a current, address-specific value estimate, run a free Upblock audit.
Population, dwelling and median figures are from the ABS 2021 Census; amenity counts from OpenStreetMap; zoning from the NSW ePlanning planning layers. Each is labelled with its source.
Public suburb pages never expose an individual owner's identity, contact details or selling intent. Address-specific analysis runs inside Upblock's private audit flow.
Enter your address to see what yours could become.
Disclaimer: Upblock provides indicative property insights for research purposes only. All information should be verified independently with qualified professionals. This is not financial, legal, or professional advice. Estimates and scenarios are indicative only and do not constitute property valuations.
