Castle Hill, NSW 2154
The Council Of The Shire Of Hornsby, New South Wales
Good to Know
Castle Hill, NSW 2154 is a high-value house market in the The Hills Shire area, currently positioned as a long-hold capital growth submarket. It sits about 30 km north-west of Sydney CBD, home to roughly 40,874 adult residents across 20,243 dwellings, with a vacancy rate of 1.74%.
According to HtAG Analytics, Castle Hill is exhibiting supply-constrained rental-strength dynamics. Stock on Market sits at 0.31% and Inventory at 3.26 months — around the ~3-month balanced-market threshold — driving -0.7% YoY price growth and +4.5% YoY rent growth.
What the market data is signalling
Castle Hill shows falling prices over the past year (-0.7%) while rents are rising (+4.5%), a split that often signals tightening rental markets with subdued sales momentum. Low Stock on Market at 0.31% and a modest Building Approvals ratio at 0.14% point to constrained fresh supply, which the Markets in the Moment (MiM™) heatmap can help you track at-a-glance.
Who lives in Castle Hill — and why it matters for investors
Castle Hill scores 1105 on the IRSAD scale, indicating relative socio-economic advantage that can support lower volatility in demand; see our IRSAD Crossover study for why this matters. Renter/Owner balance is neutral at 23.0% and the Units/Houses mix is neutral at 36.0%, while affordability is stretched at 86 years — these demographic signals shape likely tenant demand, price sensitivity and long-cycle growth potential.
Why suburb-level data matters for Castle Hill
Suburb-level metrics like Castle Hill's typical price $2,471,456, low gross yield (1.74%), Stock on Market (0.31%), Inventory (3.26 months) and days-on-market (39 days) tell a precise story for this pocket. Council-level averages can mask those nuances, so decisions should rest on the suburb's own figures — read more in our LGA vs Suburb research. For a deeper download, get the full Castle Hill data guide.
What's behind the RCS™ score of 59
The HtAG RCS™ bundles three independent dimensions — risk minimisation, capital-growth potential and cashflow resilience — into one composite score so you can quickly compare strategic fit. Reading the sub-score breakdown matters for matching Castle Hill to a specific plan; learn how the RCS™ is built. To explore the underlying indicators interactively, open Castle Hill in HtAG Copilot.
Forward signals to watch
The vacancy rate — currently 1.74%: sustained readings in this balanced band typically support steady rent growth but limit extreme upside rental pressure over 12–24 months.
The building approvals ratio — currently 0.14%: very low approvals point to constrained future supply, which can underpin medium-term price and rent support if demand holds.
The Sydney cycle phase: any city-wide shift in the Sydney cycle (softening or re-acceleration) would materially affect local transaction volumes and momentum in Castle Hill, amplifying or tempering the suburb's own signals.
Does this area meet your investment goals?
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RCS Breakdown
Castle Hill's RCS™ headline is an overall signal — but it doesn't tell you why. The three sub-scores below reveal whether that score is earned through risk minimisation, capital growth, or cashflow — and which portfolio brief it fits.
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Market Trends
Castle Hill's headline values — $2,471K to buy and $828PW to rent, a 1.74% gross yield. Over the past decade, prices have moved 69.43% and rents 40.51% — the Yield series shows whether that gap is widening (price outpacing rent, yield compressing) or closing.
$2,471K is today. The 10-year trajectory reveals whether that's the top of a run, the start of a new leg, or somewhere mid-cycle. Sign up to unlock the entire trend line.
$828PW today, with rent growth at (+4.54% YoY) compared to price growth (-0.73%). That spread determines yield is expanding or compressing across the next cycle. Sign up to unlock the entire trend line.
Where is Castle Hill in its cycle - and is the 1.74% yield holding?
Cycle phase tells you whether you're buying near the bottom (room to run) or top (compression ahead). Yield trajectory tells you whether cashflow is durable or being eroded — the single most important question for a long-hold thesis.
Cycle Phase
Cycle Position
Yield Trajectory
Rent vs Price Spread
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Area Risks
Property data alone won't flag the structural risks that can erode a long-hold position. Bushfire overlays, flood-zone exposure, and economic concentration sit outside the price feed but determine whether your capital is insurable, defensible, and structurally protected. Unlock to see.
Are there hidden structural risks shaping Castle Hill's long-hold story?
Beyond the headline price, Castle Hill carries risk signals a median can't show — hazard exposure from bushfire and flood overlays, and how narrowly local employment leans on a handful of sectors (the concentration the EDI score quantifies). Together these separate insurable, defensible long-holds from those carrying tail-risk that never surfaces in the headline number.
MADI Risk
EDI Risk
Bushfire
Flood
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Critical to know
Supply & Demand
Castle Hill's headline numbers show where the market is today. The two cards below answer where it's heading. Direction is what separates a buy from a wait.
Is housing supply tightening or building up?
Stock on Market is one number — the trend is what matters. SoM, inventory, building approvals and hold period together reveal whether the market is starving for stock (price pressure up) or quietly building a pipeline (pressure down).
Stock on Market
Inventory
Building Approvals
Hold Period
Is buyer and renter demand heating up or cooling off?
Vacancy is one signal — the real question is whether demand is still building or quietly peaking. Days on market, vacancy, search index and clearance rate are the four pulse-points — when they diverge, they signal a turning point.
Days on Market
Vacancy Rate
Search Index
Clearance Rate
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Fundamentals
Castle Hill can look solid on the surface — but the three layers below separate markets that genuinely hold value from ones that only look like they do.
Is Castle Hill genuinely stable - or just expensive?
IRSAD hints at affluence, but socio-economic strength alone doesn't guarantee resilience. Combined with the renter-to-owner balance and unit-to-house ratio, you get the three signals that separate a tightly-held submarket from one carrying hidden volatility.
IRSAD
Renter to Owner
Units to Houses
Where do Castle Hill prices go over the next 12 months?
Today's headline price is just a snapshot. Projected ROI and the volatility index tell you whether to commit capital now, wait for a softer entry, or rotate into a steadie submarket.
Projected Annual ROI
Volatility Index
Can you actually buy into Castle Hill - and exit cleanly?
Tightly-held areas reward long-hold investors but punish anyone who needs liquidity. Annual sales and rental volume reveal whether your capital can reposition — or sits structurally locked in.
Annual Sales Volume
Annual Rental Volume
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Important to know
Education & Infrastructure
Castle Hill looks tightly-held and stable on the surface — but the three layers below separate areas that genuinely hold value from ones that only look like they do.
Does Castle Hill's school catchment + infrastructure pipeline justify the price?
School ranks anchor family demand and tenant quality. The active infrastructure pipeline shifts a suburb's price ceiling over the next 5–10 years. Together they tell you whether Castle Hill has structural support for the next leg of capital growth.
School Rank
Hospitals & Employment
Infrastructure Spend
Transport Projects
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Full HtAG Intelligence
Castle Hill shows potential. The platform tells you whether it's the best fit for your portfolio.
Price and yield are only the surface. HtAG reads the forces underneath — supply tightening or loosening, demand heating or cooling, and the risks that move slowly but decide long-term growth. Together they show whether Castle Hill has the structural support for its next leg — or whether the numbers are running ahead of the fundamentals.
The total adult population (15 years or older) of Castle Hill 2154 NSW is 33,204, with a median age of 42. Of those, 60.13% are married, 7.79% are divorced or separated, 26.35% are single and 5.73% are widowed.
The average household size is 3.0 people per dwelling, and the median household monthly income is estimated to be $11,432. The median monthly mortgage repayment for households in this suburb is $3,000 which is 26.24% of their earnings.
Source: ABS Census Data (2021)