This study presents an integrated Analytic Hierarchy Process and Multi-Criteria Decision Analysis (AHP-MCDA) framework for selecting the most sustainable seismic strengthening technique for masonry infill walls in earthquake-prone regions, with Aceh, Indonesia as a case study. The AHP-MCDA framework was selected for its ability to manage complex multi-criteria decisions by combining quantitative data, qualitative assessments, and expert judgment, while incorporating consistency checks essential when quantitative data is incomplete. Five criteria (structural performance, economic aspects, durability, ease of application, and availability of analytical models were weighted through pairwise comparisons by ten local construction experts. Eight techniques were initially identified from the literature; however, two (Bamboo Reinforcement and Polypropylene Fiber Reinforcement) were excluded due to insufficient valid experimental data for standalone applications in reinforced concrete frames with masonry infill walls. The remaining six techniques (shotcrete, ferrocement, TRM, steel strips, FRP, and post-tensioning) were evaluated via structured literature review and cost simulations. Ferrocement achieved the highest MCDA score (0.77), driven by balanced performance: 161% shear capacity increase, low material cost (Rp120,243.73/m² ≈ USD 7.20), superior durability (heat, moisture, and corrosion resistance with service life >5 years), outstanding ease of application using locally available materials, and well-established analytical models. FRP ranked second (0.63) despite superior shear capacity (249% average increase), constrained by limited heat resistance, moisture degradation susceptibility, and low ease of application. Sensitivity analysis across five weighting scenarios confirmed framework robustness, with Ferrocement consistently ranked first or second. This fully re-calibratable framework provides an evidence-based tool for sustainable post-earthquake urban restoration, reducing demolition waste, conserving embodied energy, and supporting energy-saving construction through locally available materials that minimize transportation-related carbon emissions.
