Digital tools and computational design processes are rapidly changing architecture. Nonetheless their applications in humanitarian design remain under researched. Generative algorithmic design is particularly useful in humanitarian design and post disaster reconstruction. Firstly, the extreme conditions in these contexts pose many constraints that can be parametricised and form the basis of a parametric design. Secondly, optimal use of scarce resources are enabled by integrating these interrelated performance requirements. Thirdly, a robust model definition afforded through parametric modelling enables a mass customised design to adjust for different site and user requirements, and most importantly it allows improvements in subsequent design based on community evaluation. As part of an ongoing research in fusing advanced computational techniques in humanitarian architecture, the post-tsunami rebuilding program of Emergency Architects Australia in the Solomon Islands is presented as a case study to identify successes, opportunities and limitations of a system of digital tools.