Vertical extension of buildings: a systematic literature review

The rising need for urban densification due to population demands and housing shortages has resulted in heightened interest in vertical extension (VE) of buildings. This paper presents a systematic review of 119 peer-reviewed articles analyzing VE research trends. The research employs content analysis, network visualization, and co-occurrence analysis to identify important terminology and definitions, thematic emphasis, and methodological approaches utilized in VE studies, across various temporal and spatial settings. The primary focus areas within the field are structural reinforcement, VE technologies, and suitability/impact considerations. Considering methodologies, the review demonstrates significant dependence on case studies and structural modeling to evaluate the feasibility and practical applicability. The study emphasizes the necessity for standardized VE taxonomy and recommends that future research should broaden its geographical scope to offer a thorough worldwide view on VE. The outcomes offer insights for urban planners, architects, policymakers, and academics, emphasizing key areas of attention and corresponding gaps.