Integration of embodied carbon into a decision support framework for building renovation, considering energy and seismic performancePiña Fernández, Pablo (Avtor) Cerovšek, Tomo (Mentor) Stegnar, Gašper (Komentor) master thesiscivil engineeringwhole life carbonembodied carbonbuilding renovationlife cycle assessmentseismic performancelife cycle costingmulti-criteria decision makingdecision support frameworkAs operational emissions decline, embodied carbon becomes increasingly important in Europe’s post-war residential stock, where energy and seismic deficiencies may coexist. This research develops and evaluates a BIM/HBIM-based Decision Support Framework integrating Whole Life Carbon (WLC), Life Cycle Assessment (LCA), energy performance, Life Cycle Costing (LCC), seismic evidence, and Multi-Criteria Decision Making (MCDM). A 50-year period and GIFA = 3,848 m² are adopted. Applied to a Type A1 building in Ljubljana, the framework compares five scenarios from existing condition to replacement. MCDM integrates EUI, non-operational GWP, discounted LCC, and EC8-relative seismic resistance derived from external technical evidence; no dynamic seismic analysis was performed as part of this thesis. S1 achieves the lowest WLC (1,108.7 kgCO₂e/m² GIFA) but retains the S0 seismic reference of 9.6%. S3 improves energy, WLC, and LCC relative to S2 while maintaining approximately 98% EC8 resistance. S4 achieves the lowest EUI (163.25 kWh/m²·year), discounted LCC (472.83 €/m² GIFA), and the adopted 100% EC8 reference. With equal weights, S4 achieves the highest MCDM score (0.940) and ranks first in 95.23% of 176,851 combinations. The hypothesis that S3 would achieve the lowest WLC is not confirmed. The framework enables transparent comparison of carbon, energy, cost, and seismic trade-offs. S4’s result applies only within the quantified criteria, weighting structure, assumptions, and modelled system boundaries and does not establish universal superiority of replacement over retrofit.[P. Piña Fernández]20262026-09-26 08:45:28Magistrsko delo/naloga188717sl