Amphibious housing for flood-prone Dutch waterways

Published on RTF: https://www.re-thinkingthefuture.com/technology-architecture/a14802-amphibious-housing-for-flood-prone-dutch-waterways/

An amphibious house is a type of housing that is designed for flood-prone zones, not to fight with water, but to move with it. The house is supported by a buoyant foundation rather than being permanently raised on stilts or shielded by substantial flood barriers. It rests on the ground and is connected to all the utilities, just like any other building under normal circumstances. When floodwater rises, guided by fixed poles, the entire building lifts vertically and falls again after the water recedes.

Rather than treating flooding as an emergency condition, amphibious housing accepts it as a part of nature, and in a world where climate uncertainty is increasing day by day, this approach shifts the role of architecture from being protective to being coexistive with nature. It allows architecture to become adaptive instead of being defensive. The building is no longer fixed to one ground level; it becomes a flexible floating system that responds to changing water levels without losing stability or daily usability, like a fixed boat house.

The Necessity

In countries such as the Netherlands, water has always been the driving factor behind settlement patterns. The country operates as a vast natural delta where rivers like the Maas and Rhine continuously bargain with the sea, and a substantial portion of the land is below mean sea level. This balance is growing increasingly fragile today. Sea levels are gradually rising due to climate change, and river discharge and rainfall intensity are becoming more and more unpredictable. Floods that were once uncommon are becoming more common now. River systems and low-lying metropolitan areas are under growing pressure due to storm surges, extended rainfall, and abrupt cloudbursts. What was once a controllable risk is becoming a recurrent issue.

Urban pressure is still increasing at the same time. There is not much land accessible in the Netherlands due to its crowded population. Traditionally left open, floodplains and low-lying environments are now being developed for infrastructure and homes. It is no longer feasible to avoid these places entirely. The question is no longer if flooding will occur, but rather how architecture and planning will react when it does, as cities are growing into areas that are inherently susceptible to water.

Fig. 1. Flood-prone areas in the Netherlands. Source: PBL Netherlands Environmental Assessment Agency. *NAP = Amsterdam Ordnance Datum (NAP)

Condition today

The Dutch have historically responded defensively to water. Dikes, embankments, pumping stations, storm surge barriers, controlled waterways, and large national systems such as the Delta Works make up a highly engineered network intended to keep water out. Only because of this infrastructure constantly controls water levels and safeguards low-lying terrain, can entire towns and agricultural landscapes exist. This strategy continues to be an essential component of Dutch water management and has sustained steady urban growth for decades.

Newer strategies have started enhancing hard engineering in recent years. Certain regions can temporarily absorb excess water rather than entirely resist it, thanks to projects like river widening, water retention landscapes, floodable parks, and adaptive public spaces. In order to relieve pressure elsewhere, the concept of "creating room for the river" permits controlled flooding in designated areas. Instead of viewing water only as a threat, urban architecture is increasingly incorporating it into the environment.

Nonetheless, these tactics continue to function primarily on a territorial and infrastructure level. In these systems, buildings themselves are essentially static objects. In areas that are vulnerable to flooding, they are either permanently raised, severely guarded, or completely avoided. Large-scale water management and daily household life become disconnected as a result. It is still unclear how individual residences and neighborhoods can immediately adjust to fluctuating water levels without losing their ties to the city and the ground.

Fig. 2. Delta Works in the Netherlands — extensive flood defense system. Source: Holland.com.

How amphibious housing works as a solution

The core of an amphibious house is a buoyant base, usually made of hollow concrete or lightweight composite systems. This base provides enough displacement to lift the structure when water levels rise. Vertical guidance poles anchored into the ground prevent lateral movement, ensuring the house moves only up and down and remains aligned with services and access points. Flexible utility connections allow water, sewage, electricity, and communication lines to move safely during vertical movement. When the site is dry, the house rests on its foundation like a normal building. There is no visual indication of its floating capacity unless flooding occurs.

Spatially, this allows neighbourhoods to remain connected to the ground, gardens, streets, and public spaces during normal conditions. Unlike stilt housing, amphibious houses do not permanently elevate daily life. The adaptive mechanism remains dormant until required.This approach treats water as a temporary condition rather than a permanent threat.

Fig. 3: NestAbide. Amphibious house during dry and floating conditions. Source: MIT Solve.

Case study: Maasbommel, the Netherlands

One of the earliest real-world applications of amphibious housing was developed in Maasbommel, a small town along the Maas River. The site lies outside the main dike system and experiences periodic flooding. Instead of prohibiting development, the project tested whether housing itself could adapt to fluctuating water levels.The development consists of a mix of floating houses and amphibious houses. The amphibious units sit on concrete pontoons and are guided by vertical mooring posts. During high water events, the houses rise several metres while remaining stable and connected. When the flood recedes, they settle back onto their original position.The project proved its effectiveness during actual flood events, where the houses performed as intended without damage or displacement. Importantly, residents were able to continue occupying their homes without evacuation or major disruption.

What makes Maasbommel significant is not just the technical success, but the fact that it demonstrates a viable urban model rather than a prototype experiment. Streets, services, and neighbourhood life continue to function normally most of the year, while quietly adapting when water arrives.At the same time, adoption remains limited. Regulatory complexity, construction costs, and conservative housing markets slow wider replication. The project shows that while the architectural logic works, governance and policy must evolve alongside design innovation.

Fig. 4: Amphibious house with garden and parking place, July 2005 vs Amphibious house afloat, January 2011. Source: Climate-ADAPT.

Case Study: Amphibious House, Baca Architects (River Thames, UK)

One of the most compelling real-world examples of amphibious housing outside the Netherlands is Formosa, the United Kingdom’s first amphibious house, designed by Baca Architects and completed on the banks of the River Thames in Buckinghamshire. The site lies within a designated flood zone and a Conservation Area, just a few metres from the river’s edge, making conventional flood protection strategies difficult without isolating the house from the landscape.

Instead of elevating the structure on tall stilts or relying entirely on barriers, Baca’s design allows the house to sit on the ground within a purpose-made wet dock and rise vertically on fixed guide posts when floodwater arrives. A buoyant concrete hull beneath the house enables it to lift safely above flood levels and settle back once the water recedes. Flexible service connections for water, electricity, and drainage accommodate this movement, allowing the house to remain functional before, during, and after a flood.

Architecturally, the building balances innovation with familiarity. Despite its amphibious mechanism, the house retains a recognisable domestic character, with a pitched roof, insulated envelope, and a façade that responds sensitively to the surrounding context. The garden landscape is designed to flood gradually, acting as an early indicator of rising water levels. Internally, open living spaces and large glazing maintain a strong visual connection to the river, reinforcing the relationship between the house and the water it negotiates.

The project was not merely a technical exercise but a negotiation with planning, environmental, and regulatory systems unfamiliar with this typology. The design demonstrates how adaptive architecture can remain grounded in everyday living rather than becoming a specialised or isolated object. Formosa shows that amphibious housing can operate as a normal domestic environment while quietly embedding resilience within its structure, offering a credible model for living with changing flood conditions rather than resisting them.

Fig. 5: Amphibious House, UK. Source: Baca Architects.

References

Britannica (n.d.). Netherlands: People [online]. Available at: https://www.britannica.com/place/Netherlands/People (Accessed: 24 January 2026).

Urban Green-Blue Grids (n.d.). Amphibious Homes – Maasbommel, The Netherlands [online]. Available at: https://urbangreenbluegrids.com/projects/amphibious-homes-maasbommel-the-netherlands/ (Accessed: 24 January 2026).

Climate-ADAPT (n.d.). Amphibious housing in Maasbommel, The Netherlands [online]. Available at: https://climate-adapt.eea.europa.eu/en/metadata/case-studies/amphibious-housing-in-maasbommel-the-netherlands (Accessed: 24 January 2026).

366 Solutions (2020). Amphibious housing adapts to water level [online]. 13 September. Available at: https://366solutions.com/13-/09-/2020/13-amphibious-housing-adapts-water-level/ (Accessed: 24 January 2026).

Construction21 (n.d.). The Thames Amphibious House [online]. Available at: https://www.construction21.org/case-studies/h/the-thames-amphibious-house.html (Accessed: 24 January 2026).

Inhabitat (n.d.). 6 amphibious houses that float to escape flooding: Amphibious House by Baca Architects [online]. Available at: https://inhabitat.com/6-amphibious-houses-that-float-to-escape-flooding/amphibious-house-by-baca-architects/ (Accessed: 24 January 2026).

Baca Architects (n.d.). Amphibious House [online]. Available at: https://www.baca.uk.com/projects/amphibious-house (Accessed: 24 January 2026).

MIT Solve (n.d.). NAAVA: Nest Amphibious Abode for Viable Flood Adaptation [online]. Available at: https://solve.mit.edu/solutions/75391 (Accessed: 24 January 2026).

Scribd (n.d.). Case Study [online]. Available at: https://www.scribd.com/document/554524515/Case-Study (Accessed: 24 January 2026).