Sydenham flood map & planning overlays

The schematic on this page is a Sydenham flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 3% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any Sydenham address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.

About 3% of Sydenham falls within a mapped flood overlay, against the council-wide suburb average of 6%. Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.

Bushfire mapping covers Sydenham and little to none of it is mapped as bushfire-prone (the Brimbank average is 15%). Always confirm for the exact lot, as mapping can change.

About <1% of Sydenham sits inside a published aircraft noise contour. ANEF contours are forecasts published per airport and used to control noise-sensitive development; they are not a measurement at any one house, and a property can sit under a flight path and outside every contour.

The dominant planning zone in Sydenham is Neighbourhood Residential Zone (NRZ1), though the suburb also includes General Residential Zone (GRZ1) and Residential Growth Zone (RGZ1). Zoning sets what you can build and do on a site, and can differ lot by lot.

Sydenham has 1 heritage-listed place on record. Heritage listing affects what you can alter or demolish, so confirm whether a specific property is listed or near a heritage place.

Across 4,397 surveyed parcels in Sydenham, the median lot size is about 510 m². There are also 1,333 registered easements mapped in the suburb - an easement can restrict where you can build, so always check the title and overlays for the specific lot.

There is no train station inside Sydenham itself. The suburb is served by 31 bus stops.

At the 2021 Census Sydenham had 10,578 usual residents, with a median age of 37 and an average household size of 2.8 people. The wider Sydenham statistical area, which contains Sydenham, went from 9,837 people in 2001 to 12,025 in 2025, up 22%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Sydenham alone.

On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Sydenham scores 970 and sits in decile 5 of 10 nationally and decile 3 within Victoria - decile 1 being the most disadvantaged tenth of Australian suburbs and decile 10 the least. The national average score is 1000. SEIFA summarises income, education, occupation and housing across the whole suburb, so it describes the area, not any particular household in it.

Median household income in Sydenham was $1,813 a week at the 2021 Census, against $1,486 for the typical suburb in Brimbank. Median rent was $369 a week and the median mortgage repayment $1,680 a month. These are 2021 Census figures and have not been indexed to today.

A Sydenham planning report pulls every overlay - zoning, flood, bushfire, heritage, environmental and noise - that touches a single lot, on live council and state data. The interactive map preview is free; the full PDF report is $9.