Williamstown flood map & planning overlays

The schematic on this page is a Williamstown flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 4% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any Williamstown address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.

About 4% of Williamstown falls within a mapped flood overlay, against the council-wide suburb average of 9%. Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.

Bushfire mapping covers Williamstown and little to none of it is mapped as bushfire-prone (the Hobsons Bay average is 4%). Always confirm for the exact lot, as mapping can change.

The dominant planning zone in Williamstown is Neighbourhood Residential Zone (NRZ4), though the suburb also includes Public Conservation and Resource Zone (PCRZ) and Public Park and Recreation Zone (PPRZ). Zoning sets what you can build and do on a site, and can differ lot by lot.

Williamstown has 311 heritage-listed places 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 8,480 surveyed parcels in Williamstown, the median lot size is about 413 m². There are also 923 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.

Yes - Williamstown has 2 train stations: Williamstown Beach Station, Williamstown Station. It is also served by 61 bus stops.

At the 2021 Census Williamstown had 14,407 usual residents, with a median age of 45 and an average household size of 2.5 people. The wider Williamstown statistical area, which contains Williamstown, went from 14,056 people in 2001 to 17,102 in 2025, up 22%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Williamstown alone.

On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Williamstown scores 1107 and sits in decile 10 of 10 nationally and decile 10 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 Williamstown was $2,411 a week at the 2021 Census, against $2,155 for the typical suburb in Hobsons Bay. Median rent was $450 a week and the median mortgage repayment $2,700 a month. These are 2021 Census figures and have not been indexed to today.

A Williamstown 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.