The valorization of underutilized forestry residues into renewable solid biofuels offers an opportunity to reduce waste while supporting low-carbon energy transitions. This study investigated Pangium edule shell waste as a feedstock for charcoal briquette production using cassava waste starch and pine resin as a dual renewable binder system. A completely randomized factorial design was employed to examine the effects of cassava waste starch (8, 12, and 16 wt%) and pine resin (0 and 5 wt%) on proximate composition, physical properties, ignition behavior, and higher heating value (HHV). Moisture, volatile matter, ash, and fixed carbon contents ranged from 3.45–7.15%, 20.67–29.15%, 2.01–2.71%, and 61.00–73.86%, respectively, while density, compressive strength, ignition time, and HHV ranged from 0.60–0.66 g cm-3, 3.45–7.02 kg cm-2, 41–128 s, and 6,620–7,080 kcal kg-1, respectively. Increasing starch concentration significantly increased moisture, volatile matter, density, and compressive strength, but reduced fixed carbon. Pine resin markedly shortened ignition time, while its effect on ash content was comparatively limited. Among the tested formulations, 12 wt% cassava waste starch + 5 wt% pine resin (A2B2) provided the most favorable performance profile, with the highest density (0.66 g cm-3), compressive strength (7.02 kg cm-2), and HHV (7,080 kcal kg-1), together with the shortest ignition time (41 s), while maintaining 5.35% moisture, 2.18% ash, and 72.97% fixed carbon. Although volatile matter exceeded the corresponding SNI 01-6235-2000 limit, all formulations complied with the specified moisture and ash limits. The findings demonstrate that integrating P. edule shell waste with cassava waste starch and pine resin can produce a structurally robust and energy-rich solid biofuel. The study provides experimental evidence for a dual-binder strategy that balances mechanical integrity, ignition performance, and energy content, while highlighting the potential of underutilized forestry and agro-industrial residues for circular bioenergy applications.