Mount Martha flood map & planning overlays

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

Flood mapping covers Mount Martha and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 3%). Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.

Around 85% of Mount Martha is mapped as bushfire-prone, compared with a Mornington Peninsula average of 89%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.

The dominant planning zone in Mount Martha is General Residential Zone (GRZ1), though the suburb also includes Green Wedge Zone (GWZ3) and Low Density Residential Zone (LDRZ). Zoning sets what you can build and do on a site, and can differ lot by lot.

Mount Martha has 38 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 9,661 surveyed parcels in Mount Martha, the median lot size is about 871 m². There are also 4,628 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 Mount Martha itself. The suburb is served by 79 bus stops.

At the 2021 Census Mount Martha had 19,846 usual residents, with a median age of 46 and an average household size of 2.7 people. The wider Mount Martha statistical area, which contains Mount Martha, went from 12,493 people in 2001 to 20,161 in 2025, up 61%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than Mount Martha alone.

On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Mount Martha scores 1068 and sits in decile 9 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 Mount Martha was $2,097 a week at the 2021 Census, against $1,906 for the typical suburb in Mornington Peninsula. Median rent was $496 a week and the median mortgage repayment $2,167 a month. These are 2021 Census figures and have not been indexed to today.

A Mount Martha 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.