Mixed Use dominant. Median sale $4.3M over the last 24 months. 86% of decided DAs approved.
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Zoning
Castlecrag is dominated by C4 — Mixed Use. Land use rules, height, FSR, and permitted developments are set per zone in the Local Environmental Plan and refined by the Development Control Plan.
Limit varies by lot — check your address for the exact figure.
Floor Space Ratio — total floor area as a multiple of lot area.
Location
Castlecrag 2068 covers an undefined area within Willoughby City Council.
Drill into any lot in Castlecrag
Open the interactive map — click any address to see its zone, height, FSR, overlays, and approval likelihood.
Development potential
We score every lot for development signal — under-built relative to the controls, eligible for a granny flat, or sized for subdivision.
lots with remaining GFA capacity
under SEPP (Housing) 2021
lots that may support subdivision
adjoining lots with combined upside
show at least one development signal
average uplift signal across the suburb · 7 high-signal lots
Theoretical capacity if every lot built to its limit: 1,221 dwellings, with 60,943 m² of unused GFA across the suburb.
Own a property in Castlecrag?
Check your lot's exact development potential — height, FSR, granny flat, subdivision, dual-occ.
Constraints & risks
40% of lots are bushfire-prone — a bushfire assessment is likely required; also: 36% of lots have a heritage listing or sit in a Heritage Conservation Area — expect controls on demolition, alterations, and additions; 0.6% of lots intersect a Threatened Ecological Community; 0.6% of lots are exposed to projected sea-level rise.
Suburb-wide percentages — your specific lot may have all, some, or none of these.
Mapped flood-prone land
RFS bushfire-prone land mapping
Heritage item or Conservation Area
Within 100 m of EPA-listed site
Mapped TEC vegetation
Coastal hazard mapping
ANEF / aircraft noise
Architect · serves Castlecrag, NSW
13 Sunnyside Cres, Castlecrag NSW 2068
Market
Sales, rent, and yield data drawn from NSW Property Sales Information and rental bond data over the past 24 months.
DA activity
114 development applications for Castlecrag addresses were decided by Willoughby City Council over the past 24 months. 98 approved — a 86% approval rate. Average processing time: 40 days.
Demographics & lifestyle
ABS Census 2021 population data combined with lot-level amenity, healthcare, lifestyle, and crime indices.
Walkable amenity within 1 km
GP / hospital / pharmacy proximity
Cafés, parks, schools, transport
ZoneDSS Marketplace
7 businesses serving Castlecrag and nearby.
Architect
13 Sunnyside Cres, Castlecrag NSW 2068
Engineering consultant
105 Eastern Valley Way, Castlecrag NSW 2068
Garage door supplier
71 Sugarloaf Cres, Castlecrag NSW 2068
Landscaper
36 The Rampart, Castlecrag NSW 2068
Pool cleaning service
12 Rockley St, Castlecrag NSW 2068
Painter
87A Edinburgh Rd, Castlecrag NSW 2068
Run a local business? Get found by property owners researching Castlecrag.
List your business — freeFAQs
Castlecrag is dominated by the C4 (Mixed Use) zone, which covers 772 of 1,248 lots (63%). The full mix is: C4 Mixed Use (63%), R2 Low Density Residential (26%), C2 Centre Support (9%), RE1 Public Recreation (2%), E1 Local Centre (1%).
Across Castlecrag, the average maximum building height is 8.9 m and the average maximum Floor Space Ratio (FSR) is 0.19:1. Individual lots can vary materially — height and FSR are set per zone in the Local Environmental Plan (LEP) and can be modified by overlays. For an exact figure on a specific address, generate a planning report.
Yes — 313 lots in Castlecrag appear eligible for a granny flat under SEPP (Housing) 2021, based on lot size, zoning, and frontage. Eligibility is lot-specific: get a planning report on your address to confirm.
The median sale price in Castlecrag over the past 24 months is $4,300,000, across 60 sales. Median unimproved land value is $2,690,000.
Median weekly rent for a house in Castlecrag is $950. Gross rental yield works out to 1.0%.
Willoughby City Council decided 114 development applications for Castlecrag addresses over the past 24 months, with 98 approved (86% approval rate). Average processing time is 40 days. Processing time depends heavily on application complexity, council backlog, and whether the application requires referral to other agencies.
Across Castlecrag, 36% with heritage controls, 39.7% bushfire-prone. These are suburb-wide percentages — every lot has its own combination. A planning report on a specific address shows exactly which controls apply.
334 of 1,248 lots in Castlecrag show identifiable development potential — under-developed for the planning controls, eligible for a granny flat, or capable of subdivision. Average rezoning signal score: 14.0 / 100.
Continue exploring
Compare zoning, development potential, and DA activity across other suburbs in Willoughby City Council and nearby postcodes.
Engineering consultant · serves Castlecrag, NSW
105 Eastern Valley Way, Castlecrag NSW 2068
Suburb-wide stats are useful for context. For a buy-or-walk decision on a specific lot, you need every control, every constraint, and every clause cited to source.
Run a report — from A$2914-section report · LEP + SEPP + DCP cross-referenced · cited to source
Verify with official sources
Don't take our word for it. Every figure on this page is computed from authoritative New South Wales Government data — and you can verify any of it directly with the source.
Official zoning, height, FSR, and overlay maps for any NSW address. The primary source for everything on this page.
planningportal.nsw.gov.au
Cadastral lot boundaries, aerial imagery, easements, and environmental overlays from NSW Spatial Services.
maps.six.nsw.gov.au
State-listed heritage items and Heritage Conservation Areas. Search by suburb to see what's listed in Castlecrag.
hms.heritage.nsw.gov.au
Sites notified to the EPA under the Contaminated Land Management Act. Critical for due diligence on any address.
apps.epa.nsw.gov.au
Rural Fire Service map of bushfire-prone land categories. Triggers BAL assessment requirements for new builds.
rfs.nsw.gov.au
Australian Bureau of Statistics QuickStats for postcode 2068 — population, age, household composition, income, tenure.
abs.gov.au
Zoning, height, FSR, and overlays parsed from the Willoughby City Council Local Environmental Plan, applicable State Environmental Planning Policies, and the Development Control Plan. Property sales drawn from NSW Property Sales Information. DA history aggregated from the NSW Planning Portal. Heritage, flood, bushfire, contaminated land, TEC, sea-level rise, and aircraft noise overlays from the NSW Spatial Services and EPA registers. Population, age, income, and tenure from ABS Census 2021. Aggregated by ZoneDSS · last updated 2026-04-27.
Suburb-wide statistics — your specific lot may vary. Always run a planning report on the actual address before making a decision. How ZoneDSS works →