Up on the roof: a review of design, construction, and technology trends in vertical extensions

New spaces to accommodate growing urban populations should be created in a way that also reduces building lifecycle carbon emissions. In this context, the vertical extension (VE) has emerged as novel typology can increase space cities through construction of additional floor area atop existing base buildings. This paper presents review 172 VE projects worldwide provide an understanding their design and trends, classify technologies applied. Results show accelerated significantly over past decade. Although most VEs consist only small additions, often one two storeys, higher built with innovative structural strategies lightweight materials. Industrial buildings are found significant opportunities for due capacity. By comparing characteristics VEs, typologies based on architectural, structural, presented.