PropertyFlags · guideHow to check if a property is in a flood zone in Victoria
Victoria answers this question with planning overlays rather than a flood zone map, and the names matter: LSIO, SBO, Floodway Overlay, Urban Floodway Zone. Here is what each one means for a buyer, how to check any address free on VicPlan, and the one most people have never heard of until it appears on their report.
The overlays, and what each one is telling you
Land Subject to Inundation Overlay, the LSIO. Land affected by flooding from a river, creek or the coast in a 1 percent annual chance event. It is the closest thing Victoria has to what people mean by a flood zone.
Special Building Overlay, the SBO. Overland flow from the drainage system, which is water running through streets and between houses when the pipes are full. This is the surprise on many suburban Melbourne reports, because there is no river anywhere near the property.
Floodway Overlay and Urban Floodway Zone. These are the serious ones. The land is part of the active flow path, and development is heavily restricted because building there pushes water somewhere else.
Rural Floodway Overlay does the same job outside built up areas. Any of these showing on a property means the water authority has a say in what gets built.
How to check it yourself, free
Go to VicPlan, the state planning map, type the address and generate the planning property report. It is free, it takes a minute, and it lists every zone and overlay affecting the land. If a flood overlay appears, note which one, because an SBO and a Floodway Overlay are different conversations.
For depth, floor levels and flood advice, the source is the water authority. Melbourne Water covers greater Melbourne and issues property flood information, usually for a fee. In regional Victoria the catchment management authority for your area holds the flood study behind the overlay.
Then check history separately. Victoria publishes records of past flood events, and a property clear of every overlay can still sit next to a creek that went over in living memory.
The 60 second version
A PropertyFlags report queries the Victorian planning scheme overlays live for the exact address, so LSIO, SBO, Floodway and Urban Floodway all come back named rather than merged into a single flood word. It also looks for recorded historic flood events within 400 m of the property. Where the answer needs the water authority, such as a floor level, we say so instead of implying we checked it. The same report covers zoning, bushfire, heritage, the Environmental Audit Overlay for contamination history, Public Acquisition Overlays and more.
Run a free flag count on a Victorian address → · See a Victorian sample report · The same question in NSW · The same question in Queensland
Common questions
What is the flood zone map in Victoria?
Victoria does not use the phrase flood zone in its planning system. It uses overlays and zones on the planning scheme map: the Land Subject to Inundation Overlay, the Special Building Overlay, the Floodway Overlay, the Rural Floodway Overlay and the Urban Floodway Zone. Each is drawn from flood studies by the relevant water authority, and each carries different building consequences.
What is the difference between LSIO and SBO?
The Land Subject to Inundation Overlay covers land affected by flooding from a river, creek or coastal source in a 1 percent annual chance event. The Special Building Overlay covers overland flow from the stormwater drainage system, the water that runs down streets and between houses in heavy rain. A property can be in one, both or neither, and the SBO is the one people are most often surprised by because there is no river in sight.
How do I check an address for free?
Open VicPlan, the state planning map, and generate the free planning property report for the address. It lists every zone and overlay that applies, including the flood ones, and it is the same source a planning officer uses. For depth and floor level information you go to the water authority: Melbourne Water in the metro area, or the catchment management authority in regional Victoria.
Does an overlay mean the house will flood?
It means the land is mapped as affected in a modelled event, and that building work needs the water authority to agree. It does not tell you how deep, and being outside every overlay is not proof water has never come through. Overlays are drawn from studies of different ages, and unmapped overland flow exists in most suburbs.
Will a flood overlay show up in the section 32 statement?
The vendor statement includes planning information for the property, so overlays generally appear. The problem is timing rather than disclosure: the section 32 arrives once a property is on the market and you are already interested. Checking VicPlan yourself costs nothing and happens on your schedule.
Does it affect insurance?
Often. Insurers use their own flood models rather than the planning overlays, so the two can disagree in both directions. Get a quote on the exact address before you bid, because the premium is part of the cost of owning the home and it is cheaper to find out now than after the contract.