Forest Glen flood map & planning overlays
A planning-constraint profile of Forest Glen
(Hornsby, NSW) - 5.62 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
5.62 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Forest Glen'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 Forest Glen
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: observed, lowest 3,500 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.
Forest Glen at a glance
How Forest Glen is zoned
Buying in Forest Glen? 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 5.62 km², Forest Glen is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 97% is flagged bushfire-prone. There is 1 heritage-listed site on record, and the dominant land-use zone is Environmental Management. The median lot measures about 23,694 m² across 35 parcels.
Who lives in Forest Glen
Census 2021 figures published by the ABS for the Forest Glen 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 1049, and decile 8 within New South Wales. The national average is 1000.
Age profile
Share of Forest Glen's 71 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Dural - Kenthurst - Wisemans Ferry, the wider ABS statistical area containing Forest Glen. There is no annual population series published at suburb level, so this describes the surrounding area rather than Forest Glen itself.
19,993 in 2001 to 23,005 in 2025, up 15%.
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.
Forest Glen 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 Forest Glen 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 24% of Forest Glen. 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 Forest Glen. 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 Forest Glen lot.
See what's in the $9 report →Forest Glen planning - frequently asked
Is Forest Glen flood-prone?
Flood mapping covers Forest Glen and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 10%). Published flood models are held over parts of Forest Glen; the free check on the Flood Model Report page says whether one reaches a given address.
Is Forest Glen bushfire-prone?
Around 97% of Forest Glen is mapped as bushfire-prone, compared with a Hornsby average of 70%.
Is Forest Glen under a flight path?
Aircraft were observed below 3,000 ft over about 24% of Forest Glen, and over about 37% 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 3,000 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 Forest Glen?
The dominant planning zone in Forest Glen is Environmental Management, though the suburb also includes National Parks and Nature Reserves and Primary Production.
Does Forest Glen have heritage-listed places?
Forest Glen has 1 heritage-listed place on record.
What is the typical lot size in Forest Glen?
Across 35 surveyed parcels in Forest Glen, the median lot size is about 23,694 m². There are also 2 registered easements mapped in the suburb.
What is the population of Forest Glen?
At the 2021 Census Forest Glen had 71 usual residents, with a median age of 39 and an average household size of 3.5 people. The wider Dural - Kenthurst - Wisemans Ferry statistical area, which contains Forest Glen, went from 19,993 people in 2001 to 23,005 in 2025, up 15%.
Is Forest Glen an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Forest Glen scores 1049 and sits in decile 9 of 10 nationally and decile 8 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Forest Glen?
Median household income in Forest Glen was $2,583 a week at the 2021 Census, against $2,468 for the typical suburb in Hornsby. Median rent was $210 a week and the median mortgage repayment $3,467 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Glenorie The Hills Shire |
4.0 km | 4% | 93% |
| Fiddletown | 6.8 km | <1% | 100% |
| South Maroota The Hills Shire |
7.3 km | 6% | 99% |
| Canoelands | 8.2 km | 12% | 93% |
| Arcadia | 8.5 km | <1% | 82% |
| Cattai The Hills Shire |
10.1 km | 50% | 95% |
| Singletons Mill | 10.3 km | 32% | 89% |
| Middle Dural The Hills Shire |
10.4 km | 0% | 75% |
| Berrilee | 10.4 km | 3% | 98% |
| Maroota The Hills Shire |
10.7 km | <1% | 93% |