Modern synthetic biology efforts have often centred on modifying individual microbes or isolated proteins to perform specific functions—such as breaking down plastics, binding heavy metals, or processing organic pollutants. However, translating these laboratory-scale advances into systems capable of addressing large-scale environmental problems remains difficult. Engineered biofilms designed using synthetic biology principles, could provide a durable and versatile framework for next-generation bioremediation solutions, bridging the limitations of current approaches and facilitating accelerated scale-up. Using the example of plastic bioremediation, we demonstrate that enhancing a microbial chassis' ability to attach to and form a biofilm on plastic can maximise the local concentration of the enzyme around the target substrate which subsequently increases the overall rate of plastic degradation. We designed synthetic constructs to allow control over the levels of the universal eubacterial second messenger, Cyclic-di-GMP. This signalling molecule is known to trigger biofilm formation in the vast majority of bacterial species. Increasing the levels of Cyclic-di-GMP in our microbial chassis led to an anticipated increase in biofilm levels on the plastic substrates and a concomitant increase in the levels of polyester degradation in cells expressing novel and well characterised polyester-degrading enzymes. This provides a proof-of-principle that modulating biofilm formation is a viable mechanism to fast track and potentially scale-up the development of bacterial plastic bioremediation solutions.