Blackwall flood map & planning overlays

A planning-constraint profile of Blackwall (Central Coast, NSW) - 1.6 km², mapped from live council and state overlay data. This suburb is highly constrained.
Profile updated 26 September 2026.

Suburb-wide figures; the free map shows which overlays touch your lot.

Planning schematicBlackwall

Constraint readout

1.6 km² - this suburb is highly constrained by planning overlays.

Flood overlay 48%

1.6× council avg (30%) · #32 of 148 mapped council suburbs

Bushfire-prone 43%

below council avg (69%) · #124 of 150 mapped council suburbs

Environmental0%

below council avg (38%) · #142 of 150 in council

Heritage sites 4 Aircraft seen below 3,000 ft 50% Mostly Low Density Residential Flood 32nd most affected of 148 → Bushfire 124th most affected of 150 →

Elevation hillshade with street names, clipped to Blackwall's boundary, with the flood, bushfire and environmental overlays drawn on top. Magenta is where aircraft were observed in the sampled period, brightest below 3,000 ft.

Nearby suburbs, nearest first

Aircraft noise and flight paths over Blackwall

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 25 Sep 2026

Under observed aircraft

50%

of the suburb, at or below 10,000 ft

Below 3,000 ft

50%

of the suburb's area

Lowest measured

500 ft

averaging 1,500 ft

Busiest square

~1 a day

1 a day below 3,000 ft · ±29% · area average
typical observed square 1 a day

Night movements: observed, lowest 2,000 ft - night is sampled as often as day, but night traffic is light, so this is a floor and no rate can be put on it.

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.

Blackwall at a glance

Parcels 814 Median lot 651 m² Mapped easements 2 Bus stops 58

How Blackwall is zoned

Low Density Residential 32%

Recreational Waterways 28%

Public Recreation 26%

General Residential 9%

Infrastructure 4%

General Industrial 1%

Buying in Blackwall? 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 1.6 km², Blackwall is highly constrained by planning overlays. About 48% of the suburb sits within a mapped flood overlay, and 43% is flagged bushfire-prone. There are 4 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 651 m² across 814 parcels.

Who lives in Blackwall

Census 2021 figures published by the ABS for the Blackwall suburb boundary itself, not a wider region.

Population

1,941

usual residents, 2021

Median age

years

Median household income

$1,449

per week, Central Coast suburb typical $1,735

Median rent

$390

per week, Central Coast suburb typical $400

Median mortgage

$2,024

per month

Household size

2.2

people, average

Socio-economic standing

ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.

Advantage and disadvantage (IRSAD) Decile 4

most disadvantagedleast disadvantaged

Score 969, and decile 4 within New South Wales. The national average is 1000.

Relative disadvantage (IRSD) Decile 4

most disadvantagedleast disadvantaged

Age profile

Share of Blackwall's 1,941 residents in each ABS age band.

0-4 5.3%

5-14 10.7%

15-19 5.0%

20-24 5.0%

25-34 11.3%

35-44 12.1%

45-54 13.7%

55-64 13.7%

65-74 12.1%

75-84 8.7%

85+ 2.3%

Population trend, 2001 to 2025

Estimated resident population of Woy Woy - Blackwall, the wider ABS statistical area containing Blackwall. There is no annual population series published at suburb level, so this describes the surrounding area rather than Blackwall itself.

13,029 in 2001 to 14,566 in 2025, up 12%.

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.

Blackwall data sources and coverage

“Not mapped” means we hold no source layer for this suburb - never an all-clear.

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
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 26 September 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 Blackwall 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.

Aircraft have been seen below 3,000 ft over about 50% of Blackwall. 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 Blackwall lot.

See what's in the $9 report →

Blackwall planning - frequently asked

Is Blackwall flood-prone?

About 48% of Blackwall falls within a mapped flood overlay, against the council-wide suburb average of 30%.

Is Blackwall bushfire-prone?

Around 43% of Blackwall is mapped as bushfire-prone, compared with a Central Coast average of 69%.

Is Blackwall under a flight path?

Aircraft were observed below 3,000 ft over about 50% of Blackwall, in the period sampled (4 Sep 2026 to 25 Sep 2026). The lowest measured aircraft was at 500 ft, with an average of 1,500 ft. At the busiest point in the suburb about 1 aircraft a day were recorded passing over one 500 m square. 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 Blackwall?

The dominant planning zone in Blackwall is Low Density Residential, though the suburb also includes Recreational Waterways and Public Recreation.

Does Blackwall have heritage-listed places?

Blackwall has 4 heritage-listed places on record.

What is the typical lot size in Blackwall?

Across 814 surveyed parcels in Blackwall, the median lot size is about 651 m². There are also 2 registered easements mapped in the suburb.

Does Blackwall have a train station?

There is no train station inside Blackwall itself. The suburb is served by 58 bus stops.

What is the population of Blackwall?

At the 2021 Census Blackwall had 1,941 usual residents, with a median age of 45 and an average household size of 2.2 people. The wider Woy Woy - Blackwall statistical area, which contains Blackwall, went from 13,029 people in 2001 to 14,566 in 2025, up 12%.

Is Blackwall an advantaged suburb?

On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Blackwall scores 969 and sits in decile 4 of 10 nationally and decile 4 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).

What is the median household income in Blackwall?

Median household income in Blackwall was $1,449 a week at the 2021 Census, against $1,735 for the typical suburb in Central Coast. Median rent was $390 a week and the median mortgage repayment $2,024 a month.

Compare nearby suburbs

Nearby suburb	Distance	Flood mapped	Bushfire-prone
Ettalong Beach	1.2 km	54%	5%
Booker Bay	1.5 km	82%	<1%
Daleys Point	1.5 km	32%	69%
St Huberts Island	1.6 km	97%	0%
Wagstaffe	2.0 km	54%	50%
Umina Beach	2.6 km	47%	39%
Pretty Beach	2.6 km	52%	54%
Empire Bay	3.0 km	60%	61%
Hardys Bay	3.1 km	4%	91%
Killcare	3.1 km	39%	68%

See all Central Coast suburb profiles →