A standard three-bedder at risk of deluge is worth roughly $75,500 less than a comparable property free from the threat of inundation.

The fresh analysis of home prices and flood risks confirms as many as 70 per cent of vulnerable homes are priced at a discount.

The report from real estate data firm PropTrack and environmental not-for-profit Climate Council challenges existing research suggesting flood-hit property markets bounce back quickly after a disaster.

By separating vulnerable homes from the flood-risk free in a "market first" dataset, researchers were able to find at-risk properties did recover but from a lower base.

As well, homes out of reach of floodwaters usually rose in value faster that at-risk properties.

The result is the gap widening over time between at-risk homes

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