Abstract: Over the next century or two, sea level rise with more frequent storm surges due to climate change will invoke serious problems which are particularly foreseen in LECZ (Low-elevation coastal zone) such as lakes and riverside areas below sea level. With urbanization, coastal cities have brought numerous benefits, such as new urban development, improved transportation networks, and stable sources of economic income. However, the extensive coastal development poses risks in the degradation of coastlines and their ecology. Large-scale landfill is built to extend coastal areas with hard structures to accommodate new buildings and infrastructures may have a significant impact on marine ecology. The future strategies to accommodate water and build in coexistence with nature rather than opposing water is our objective in the future. Our research focuses on the architectural aspects of the floating community merging the gap between the planning and engineering fields. Floating platforms with modularisation and plugin units were chosen because of their flexibility to expand the needs of a community. It is basically a floating structure composed of modularized units that are interconnected on water and host all kinds of functions in order to make living on water desirable. This particular concept is developed to respond to four of the 6R’s sustainable theories (Reduce*, Reuse*, Recycle, Renew, Revalue*, Reliance*). The concept proposes sustainable theory for LECZ development of a potential site which is a lake. Firstly we “Reduce” the soil in a low-lying ground through, cut and fill, the topsoil is excavated from the site and relocated so as to raise the low-elevation site above sea level. The excavated soil creates an area a few meters below the original surface level, water is let in to produce an impoundment. Subsequently, the foundations for an urban community are set afloat within the impoundment, with buildings and other facilities settled down on these floating foundations. Secondly “Reuse” is a scenario adapted for providing flexibility to change or reconfigure the functions of the floating community. The water space within the impoundment is a controlled area which can be reused based on the situation. For instance, a floating community can be reused as a research hub or a resort. Thirdly we should be mindful of “Revalue” water which can be learned from the past history and philosophy of East Asia Water towns were constructed in many parts using the water network as an effective form of transportation interconnecting the town for trade. Lastly, the fact that being dependent upon a single source water supply system and energy is not an effective “Reliance” a multi-water supply system with farming on water will become more self-sustaining efficient, economical and safe. The paper proposes a sustainable design concept for community living in LECZ. The sustainable theory is applied in a lake to experiment with the design by applying the theories to diminish the impact of large-scale coastal land reclamation to keep a balanced ecology. The research method is identifying gaps and providing a feasible solution and how the ideology can be made more desirable for people living on water. The goal of a sustainable community is not only resilient in withstanding global environmental disasters but also to simultaneously produce a minimum burden on the environment and realise a truly sustainable community. Keywords: Floating community, Sustainability, Coastal Lake development, Ecology