Balcolyn zoning & planning overlays
A planning-constraint profile of Balcolyn
(Lake Macquarie, NSW) - 0.72 km², mapped from live council and
state overlay data. This suburb is highly constrained on the overlays we could measure - no flood mapping covers this suburb, so this is not a suburb-wide verdict.
Profile updated 3 October 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
0.72 km² - this suburb is highly constrained on the overlays we could measure - no flood mapping covers this suburb, so this is not a suburb-wide verdict.
Elevation hillshade with street names, clipped to Balcolyn's boundary, with the bushfire and environmental overlays drawn on top. Magenta is where aircraft were observed in the sampled period, brightest below 3,000 ft. No flood layer is drawn because we hold no flood mapping for this area.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Balcolyn
Two different things, kept apart on purpose. The ANEF contour is the planning instrument - a forecast published per airport that planning schemes use to control noise-sensitive development. Observed overflight is what a sampled aircraft-tracking feed actually recorded over the suburb - where aircraft flew, how low and how often.
Observed overflight - sampled 4 Sep to 2 Oct 2026
Night movements: not established - night is sampled as often as day, but too few night flights have been seen here to conclude either way.
Traffic is sampled rather than watched continuously, so every figure is a floor: aircraft not captured between samples are not represented. Rates are per 500 m square - the busiest square in the suburb, not a count of flights over the suburb - and a square is only rated where enough traffic was seen to measure it. Altitudes are above mean sea level. Flight paths change with runway use, weather, season and airspace design. This is a record of observed traffic; it is not a noise contour and not a planning control.
Balcolyn at a glance
How Balcolyn is zoned
Buying in Balcolyn? 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 0.72 km², Balcolyn is highly constrained by the planning overlays we hold. We hold no flood mapping covering this suburb, so no flood figure is shown - that is a gap in our data, not an all-clear. Of what is mapped, 37% is flagged bushfire-prone. The dominant land-use zone is Low Density Residential. The median lot measures about 699 m² across 482 parcels.
Who lives in Balcolyn
Census 2021 figures published by the ABS for the Balcolyn 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 949, and decile 3 within New South Wales. The national average is 1000.
Age profile
Share of Balcolyn's 1,002 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Bonnells Bay - Silverwater, the wider ABS statistical area containing Balcolyn. There is no annual population series published at suburb level, so this describes the surrounding area rather than Balcolyn itself.
7,450 in 2001 to 10,266 in 2025, up 38%.
Source: ABS Census 2021 and SEIFA 2021 (Suburbs and Localities), Regional Population (SA2), CC BY 4.0. Small counts are randomly adjusted by the ABS.
Balcolyn data sources and coverage
“Not mapped” means we hold no source layer for this suburb - never an all-clear.
| Dataset | Coverage | Publisher |
|---|---|---|
| Flood mapping | Not 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 |
| Aircraft noise contours (ANEF) | Not held | NSW Government spatial services, NSW ePlanning and published council flood studies, Defence |
| Observed flight paths | Observed | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 3 October 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 Balcolyn 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.
The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Balcolyn lot.
See what's in the $9 report →Balcolyn planning - frequently asked
Is Balcolyn flood-prone?
We don't yet hold flood mapping covering Balcolyn, so this page can't say how much of the suburb is flood-affected - that is a gap in our data, not an indication that the suburb is free of flood risk. Lake Macquarie is the authority to check for flood mapping in this area.
Is Balcolyn bushfire-prone?
Around 37% of Balcolyn is mapped as bushfire-prone, compared with a Lake Macquarie average of 65%.
Is Balcolyn under a flight path?
Aircraft were observed over about 11% of Balcolyn in the period sampled, but only above 3,000 ft - the lowest measured was 1,500 ft. Traffic is sampled rather than watched continuously and flight paths change with runway use, weather and season; the ANEF contour is the planning instrument.
What is the zoning in Balcolyn?
The dominant planning zone in Balcolyn is Low Density Residential, though the suburb also includes Environmental Conservation and Public Recreation.
Does Balcolyn have heritage-listed places?
No heritage-listed places are on record within Balcolyn.
What is the typical lot size in Balcolyn?
Across 482 surveyed parcels in Balcolyn, the median lot size is about 699 m². There are also 1 registered easements mapped in the suburb.
Does Balcolyn have a train station?
There is no train station inside Balcolyn itself. The suburb is served by 15 bus stops.
What is the population of Balcolyn?
At the 2021 Census Balcolyn had 1,002 usual residents, with a median age of 43 and an average household size of 2.5 people. The wider Bonnells Bay - Silverwater statistical area, which contains Balcolyn, went from 7,450 people in 2001 to 10,266 in 2025, up 38%.
Is Balcolyn an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Balcolyn scores 949 and sits in decile 3 of 10 nationally and decile 3 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Balcolyn?
Median household income in Balcolyn was $1,525 a week at the 2021 Census, against $1,636 for the typical suburb in Lake Macquarie. Median rent was $390 a week and the median mortgage repayment $1,733 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Yarrawonga Park | 0.8 km | Not mapped | 80% |
| Silverwater | 1.1 km | Not mapped | 91% |
| Mirrabooka | 2.0 km | <1% | 72% |
| Brightwaters | 2.0 km | <1% | 75% |
| Sunshine | 2.1 km | 2% | 80% |
| Windermere Park | 3.0 km | Not mapped | 33% |
| Bonnells Bay | 3.3 km | 2% | 54% |
| Morisset Park | 3.4 km | 5% | 33% |
| Eraring | 3.6 km | 32% | 60% |
| Wangi Wangi | 4.0 km | Not mapped | 50% |