We present analytically derived and experimentally validated bending capacity models for strip-reinforced glued laminated timber beams using carbon-fiber reinforced polymer sheets. Motivated by sustainability and efficiency concerns, the study demonstrates substantial mechanical improvements, with bending strength increases up to 74%, flexural rigidity enhancements up to 65%, and timber volume reductions of up to 44% for comparable reliability. Reliability analyses further confirm significant timber savings while maintaining structural safety. Although reinforced beams showed higher cradle-to-gate environmental impacts, these are justified by mechanical performance and reduced timber usage.