Welby flood map & planning overlays
A planning-constraint profile of Welby
(Wingecarribee, NSW) - 1.9 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
1.9 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Welby'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 Welby
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 1 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.
Welby at a glance
How Welby is zoned
Buying in Welby? 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 1.9 km², Welby is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 77% is flagged bushfire-prone. There are 2 heritage-listed sites on record, and the dominant land-use zone is Environmental Conservation. The median lot measures about 1,011 m² across 364 parcels.
Who lives in Welby
Census 2021 figures published by the ABS for the Welby 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 916, and decile 2 within New South Wales. The national average is 1000.
Age profile
Share of Welby's 764 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Mittagong, the wider ABS statistical area containing Welby. There is no annual population series published at suburb level, so this describes the surrounding area rather than Welby itself.
8,121 in 2001 to 11,381 in 2025, up 40%.
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.
Welby 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 Welby 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 Welby lot.
See what's in the $9 report →Welby planning - frequently asked
Is Welby flood-prone?
Flood mapping covers Welby and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 0%).
Is Welby bushfire-prone?
Around 77% of Welby is mapped as bushfire-prone, compared with a Wingecarribee average of 90%.
Is Welby under a flight path?
Aircraft were observed over about 37% of Welby in the period sampled, but only above 3,000 ft - the lowest measured was 3,500 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 Welby?
The dominant planning zone in Welby is Environmental Conservation, though the suburb also includes Low Density Residential and Infrastructure.
Does Welby have heritage-listed places?
Welby has 2 heritage-listed places on record.
What is the typical lot size in Welby?
Across 364 surveyed parcels in Welby, the median lot size is about 1,011 m².
Does Welby have a train station?
There is no train station inside Welby itself. The suburb is served by 12 bus stops.
What is the population of Welby?
At the 2021 Census Welby had 764 usual residents, with a median age of 42 and an average household size of 2.5 people. The wider Mittagong statistical area, which contains Welby, went from 8,121 people in 2001 to 11,381 in 2025, up 40%.
Is Welby an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Welby scores 916 and sits in decile 2 of 10 nationally and decile 2 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Welby?
Median household income in Welby was $1,357 a week at the 2021 Census, against $1,958 for the typical suburb in Wingecarribee. Median rent was $376 a week and the median mortgage repayment $1,733 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Willow Vale | 3.9 km | 0% | 60% |
| Renwick | 4.3 km | 0% | 22% |
| Bowral | 4.9 km | 4% | 68% |
| Balaclava | 4.9 km | 0% | 66% |
| Woodlands | 5.1 km | 0% | 100% |
| Braemar | 5.3 km | 0% | 44% |
| Mittagong | 5.6 km | 0% | 90% |
| Aylmerton | 6.3 km | 0% | 90% |
| Colo Vale | 7.6 km | 0% | 97% |
| Burradoo | 8.1 km | 2% | 42% |