Baulkham Hills flood map & planning overlays

A planning-constraint profile of Baulkham Hills (The Hills Shire, NSW) - 13.72 km², mapped from live council and state overlay data. This suburb is moderately constrained.
Profile updated 3 October 2026.

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

Planning schematicBaulkham Hills

Constraint readout

13.72 km² - this suburb is moderately constrained by planning overlays.

Flood overlay 0%

below council avg (9%) · #17 of 23 mapped council suburbs

Modelled flood depth held over parts of Baulkham Hills

Bushfire-prone 13%

below council avg (62%) · #20 of 23 mapped council suburbs

Environmental1%

below council avg (6%) · #14 of 23 in council

Heritage sites 36 Aircraft seen below 3,000 ft 94% Mostly Low Density Residential Bushfire 20th most affected of 23 →

Elevation hillshade with street names, clipped to Baulkham Hills'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 Baulkham Hills

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

Under observed aircraft

100%

of the suburb, at or below 10,000 ft

Below 3,000 ft

94%

of the suburb's area

Lowest measured

500 ft

averaging 4,000 ft

Busiest square

~34 a day

11 a day below 3,000 ft · ±17%
typical observed square 4 a day

Night movements: observed, lowest 1,000 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.

Baulkham Hills at a glance

Parcels 10,175 Median lot 741 m² Mapped easements 22 Bus stops 462

How Baulkham Hills is zoned

Low Density Residential 71%

Public Recreation 12%

Medium Density Residential 8%

Infrastructure 4%

High Density Residential 2%

Environmental Conservation 1%

Buying in Baulkham Hills? 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 13.72 km², Baulkham Hills is moderately constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 13% is flagged bushfire-prone. There are 36 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 741 m² across 10,175 parcels.

Who lives in Baulkham Hills

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

Population

37,415

usual residents, 2021

Median age

years

Median household income

$2,474

per week, The Hills Shire suburb typical $2,650

Median rent

$520

per week, The Hills Shire suburb typical $560

Median mortgage

$2,600

per month

Household size

3.0

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 10

most disadvantagedleast disadvantaged

Score 1111, and decile 10 within New South Wales. The national average is 1000.

Relative disadvantage (IRSD) Decile 10

most disadvantagedleast disadvantaged

Age profile

Share of Baulkham Hills's 37,415 residents in each ABS age band.

0-4 5.9%

5-14 15.8%

15-19 5.9%

20-24 4.9%

25-34 9.6%

35-44 17.5%

45-54 13.8%

55-64 10.4%

65-74 9.0%

75-84 5.3%

85+ 1.9%

Population trend, 2001 to 2025

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

19,901 in 2001 to 25,268 in 2025, up 27%.

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.

Baulkham Hills 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 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 Baulkham Hills 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 94% of Baulkham Hills. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.

Published flood models are held over parts of Baulkham Hills. The free check tells you whether one reaches an address; where it does, a Flood Model Report is +$9 with the planning report.

Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Baulkham Hills lot.

See what's in the $9 report →

Baulkham Hills planning - frequently asked

Is Baulkham Hills flood-prone?

Flood mapping covers Baulkham Hills and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 9%). Published flood models are held over parts of Baulkham Hills; the free check on the Flood Model Report page says whether one reaches a given address.

Is Baulkham Hills bushfire-prone?

Around 13% of Baulkham Hills is mapped as bushfire-prone, compared with a The Hills Shire average of 62%.

Is Baulkham Hills under a flight path?

Aircraft were observed below 3,000 ft over about 94% of Baulkham Hills, and over about 100% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 2 Oct 2026). The lowest measured aircraft was at 500 ft, with an average of 4,000 ft. At the busiest point in the suburb about 34 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 Baulkham Hills?

The dominant planning zone in Baulkham Hills is Low Density Residential, though the suburb also includes Public Recreation and Medium Density Residential.

Does Baulkham Hills have heritage-listed places?

Baulkham Hills has 36 heritage-listed places on record.

What is the typical lot size in Baulkham Hills?

Across 10,175 surveyed parcels in Baulkham Hills, the median lot size is about 741 m². There are also 22 registered easements mapped in the suburb.

Does Baulkham Hills have a train station?

There is no train station inside Baulkham Hills itself. The suburb is served by 462 bus stops.

What is the population of Baulkham Hills?

At the 2021 Census Baulkham Hills had 37,415 usual residents, with a median age of 39 and an average household size of 3.0 people. The wider Baulkham Hills - East statistical area, which contains Baulkham Hills, went from 19,901 people in 2001 to 25,268 in 2025, up 27%.

Is Baulkham Hills an advantaged suburb?

On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Baulkham Hills scores 1111 and sits in decile 10 of 10 nationally and decile 10 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).

What is the median household income in Baulkham Hills?

Median household income in Baulkham Hills was $2,474 a week at the 2021 Census, against $2,650 for the typical suburb in The Hills Shire. Median rent was $520 a week and the median mortgage repayment $2,600 a month.

Compare nearby suburbs

Nearby suburb	Distance	Flood mapped	Bushfire-prone
Winston Hills City Of Parramatta	2.6 km	0%	9%
Bella Vista	3.0 km	<1%	0%
Castle Hill	3.0 km	0%	19%
Norwest	3.2 km	0%	0%
Northmead City Of Parramatta	3.6 km	0%	22%
North Rocks City Of Parramatta	4.1 km	0%	48%
Old Toongabbie City Of Parramatta	4.2 km	0%	2%
Kings Langley Blacktown	4.3 km	7%	0%
Constitution Hill City Of Parramatta	4.4 km	0%	0%
West Pennant Hills	4.7 km	0%	36%

See all The Hills Shire suburb profiles →