This work investigates pathways of Mediterranean WUI building ignition, to define design recommendations aimed to increase resilience to radiative heat, embers, and smoke. Research has identified vulnerable WUI building features, and developed the defensible space concept to protect from damage by flame impingement and radiation. This thesis, however, focuses on specific Mediterranean building geometries and materials, and the wildfire threats they face (Hakes, Caton, & Gorham, 2017). During the 2017 Portugal Pedrógão Grande Fire, embers ignited over 60% of damaged buildings (Ribeiro, Rodrigues, & Lucas, 2020). This research focuses on ember transport, accumulation, and ignition, as it relates to building survivability. Statistical analysis will be used to identify ignition pathways from post-fire data. FDS computer simulations are generated to define the performance of features under selected wildfire exposure conditions; simulations will be validated through small-scale experiments on material flammability, and large-scale experiments on feature performance.