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Despite its potential to decarbonise the built environment, wood is often found on construction sites as a source of waste rather than building material. In Denmark, wood is mainly used for temporary structures envisioned for short life cycles and single use, after which it is destined for incineration, defining it as “sustainable energy”. This research proposes an innovative design-to-fabrication process for sourcing timber waste as a valuable matter for a novel typology of structural elements, thereby extending their lifecycle and carbon sequestration capabilities. The work employs a voxel-based approach to designing and optimising complex wood structures, utilising computational stress analysis to determine material layouts reflecting the reclaimed stock. The physical construction voxels, with specific material strength and fibre orientation, are laminated into a functionally graded composite structure, namely the Re-VoxLam Beam. This prototype is demonstrated as a proof-of-concept of the proposed approach for decarbonising construction and upcycling wood waste.