Clontarf flood map & planning overlays
A planning-constraint profile of Clontarf
(Northern Beaches, NSW) - 0.86 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 3 October 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
0.86 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Clontarf'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 Clontarf
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
typical observed square 4 a day
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.
Clontarf at a glance
How Clontarf is zoned
Buying in Clontarf? 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 0.86 km², Clontarf is highly constrained by planning overlays. About 8% of the suburb sits within a mapped flood overlay, and 39% is flagged bushfire-prone. There are 14 heritage-listed sites on record, and the dominant land-use zone is Low Density Residential. The median lot measures about 606 m² across 716 parcels.
Who lives in Clontarf
Census 2021 figures published by the ABS for the Clontarf 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 1189, and decile 10 within New South Wales. The national average is 1000.
Age profile
Share of Clontarf's 1,746 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Balgowlah - Clontarf - Seaforth, the wider ABS statistical area containing Clontarf. There is no annual population series published at suburb level, so this describes the surrounding area rather than Clontarf itself.
18,445 in 2001 to 20,936 in 2025, up 14%.
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.
Clontarf 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 Clontarf 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 100% of Clontarf. 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 Clontarf. 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 Clontarf lot.
See what's in the $9 report →Clontarf planning - frequently asked
Is Clontarf flood-prone?
About 8% of Clontarf falls within a mapped flood overlay, against the council-wide suburb average of 12%. Published flood models are held over parts of Clontarf; the free check on the Flood Model Report page says whether one reaches a given address.
Is Clontarf bushfire-prone?
Around 39% of Clontarf is mapped as bushfire-prone, compared with a Northern Beaches average of 47%.
Is Clontarf under a flight path?
Aircraft were observed below 3,000 ft over about 100% of Clontarf, in the period sampled (4 Sep 2026 to 2 Oct 2026). The lowest measured aircraft was at 500 ft, with an average of 5,500 ft. At the busiest point in the suburb about 37 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 Clontarf?
The dominant planning zone in Clontarf is Low Density Residential, though the suburb also includes National Parks and Nature Reserves and Public Recreation.
Does Clontarf have heritage-listed places?
Clontarf has 14 heritage-listed places on record.
What is the typical lot size in Clontarf?
Across 716 surveyed parcels in Clontarf, the median lot size is about 606 m². There are also 1 registered easements mapped in the suburb.
Does Clontarf have a train station?
There is no train station inside Clontarf itself. The suburb is served by 13 bus stops.
What is the population of Clontarf?
At the 2021 Census Clontarf had 1,746 usual residents, with a median age of 47 and an average household size of 3.0 people. The wider Balgowlah - Clontarf - Seaforth statistical area, which contains Clontarf, went from 18,445 people in 2001 to 20,936 in 2025, up 14%.
Is Clontarf an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Clontarf scores 1189 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 Clontarf?
Median household income in Clontarf was $4,609 a week at the 2021 Census, against $2,778 for the typical suburb in Northern Beaches. Median rent was $1,250 a week and the median mortgage repayment $5,317 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Balgowlah Heights | 1.1 km | 2% | 48% |
| Balgowlah | 1.6 km | 11% | 8% |
| Seaforth | 2.1 km | 2% | 37% |
| North Balgowlah | 2.3 km | 3% | 26% |
| Fairlight | 2.5 km | 14% | 0% |
| North Harbour Unincorporated - Sydney Harbour Area |
2.5 km | 0% | 13% |
| Mosman Mosman |
2.5 km | Not mapped | 29% |
| Middle Harbour Unincorporated - Sydney Harbour Area |
2.6 km | 0% | 29% |
| Manly Vale | 3.0 km | 28% | 23% |
| Castlecrag Willoughby |
3.2 km | Not mapped | 44% |