Flood Proof House Design: Insights from an Award-Winning Architect

July 2025 Update

Why do we need flood-proof houses?

South-East Queensland’s climate is one of its best features, with regular sunshine and mild weather year-round. But in recent years, flooding has become more frequent and severe — making it critical for homeowners to consider flood-proof house design.

If you live in South-East Queensland, preparing for future flood events is no longer optional. A flood-proof house can help protect your home, your belongings, and your family from the growing risks posed by our changing climate.

Home Designs for a Flood-Proof House

As a Brisbane architect, one of my key areas of focus is designing homes that are either flood-proof or flood-resistant. The likelihood of flooding is an important factor to consider when purchasing land or building a new home, especially in flood-prone areas.

While a flood warning doesn’t necessarily make a site unusable, it does mean you’ll need to take additional precautions. A well-designed flood-proof house can help you mitigate these risks and build with confidence.

Award-winning flood-proof house design featuring elevated living spaces, open lower levels, and natural ventilation — a winning entry in the Flood Zone House Design Competition.

View our Grantham National Award-Winning Flood-Proof House design

Flood-Proof House Design Options

When designing homes for flood-prone sites in and around Brisbane, there are two main strategies to improve flood resilience. The first is to stop water from entering the property. The second is to design a flood-proof house that can safely cope with water inundation.

Option 1: Stop Water From Getting In

This is the more challenging of the two strategies. Floodwaters can be incredibly powerful, especially when flowing through stormwater overflow paths.

When water carries debris, the combined force and weight place extreme pressure on anything in its way. It’s important to consider just how high the floodwaters could rise during a major event.

To keep your flood-prone property dry, you’d need to create a barrier — essentially a waterproof wall around your site. While building a concrete dam isn’t practical for most properties, it may be possible to adapt your perimeter fence into a waterproof barrier.

The Downsides

This approach does come with several drawbacks. For one, depending on your current fence design, upgrading to a fully waterproof barrier can be a costly endeavour.

The fence must not only prevent water from passing through, but also be strong enough to withstand the immense pressure of floodwaters. Without sufficient structural support, the fence could collapse under the weight.

Additionally, access points such as gates and driveways create weak spots in the barrier. These can be managed using sandbags or emergency panels during a flood event, but they still represent a potential risk.

While this solution can work for many Brisbane properties, it isn’t foolproof. Water may still breach the barrier if it rises above the wall or if the structure fails due to debris impact or pressure.

View our Norman Park Home Renovation

Option 2: Designing a Home to Cope With Flooding

In many cases, a better solution isn’t to keep the water out; it’s to design a home that can safely handle rising water levels. This approach is often more cost-effective and can lead to better long-term outcomes.

Rather than risk damage to your living areas, we elevate the important spaces by building the home on posts. This creates a flood-proof house that allows water to pass beneath without harming key areas. Pavilion-style layouts are often ideal, as they keep bedrooms, kitchens, and living rooms well above potential flood levels.

The lower level can then be used as a garage, workshop, or flexible multipurpose space.

Material selection is also critical. For any flood-proof house, we use materials that are strong enough to withstand the force of floodwaters and easy to clean or replace afterwards. In many cases, affordable materials such as plasterboard can be used in lower areas, knowing they may need to be replaced after a flood.

Severe urban flooding showing multiple submerged vehicles highlights the real risk Brisbane homeowners face in flood-prone areas — reinforcing the importance of flood-proof house design.

Talk to Brisbane Specialists in Flood-Resistant and Flood-Proof House Design

At dion seminara architecture, we specialise in designing flood-proof houses tailored to South-East Queensland’s unique climate and topography.

Our work was recognised with a win in the prestigious LJ Hooker Grantham Flood Home Design Competition, and we’ve even consulted internationally on flood-resistant housing, including in New York following Hurricane Sandy.

If your property is at risk of flooding — whether from rivers, creeks, tidal surges, or overland flow — we can help.

We’ll work with you to design a flood-proof house that keeps your family, belongings, and home safe.

Contact us today to explore your options and gain peace of mind.