This thesis develops a hybrid classification to make Italy’s regional building maps more useful for energy analysis. Piedmont, Lazio and Sicily were used as examples because their technical maps differ greatly in detail, structure and reference year. To bring them onto the same page, I cleaned and harmonised their uso fields, building footprints and height information (from regional datasets, DTM/DEM and GHSL), and merged everything into one consistent geodatabase. The hybrid classes extend the usual R/P/S/T categories with a small number of energy-relevant sub-types, especially in the residential sector. This helps translate very different local labels into a compact, nationally applicable scheme that still reflects how buildings are used in practice.