<![CDATA[This study examines space modification in one-bedroom-plus condominium units in Bangkok, focusing on the relationship between Generation Y’s characteristics and how they adapt interior layouts to suit their lifestyles. While previous research has addressed flexible housing in general, few studies have focused specifically on how Generation Y modifies space within condominium units to accommodate their needs in the Bangkok context. The study analysed 7,596 one-bedroom-plus units developed in Bangkok and modified by 44 architectural stakeholders to reflect Generation Y's preferences. Using function, partition, and floor indicators, and applying k-means cluster analysis, six spatial modification approaches were identified: open-space layouts, functional space redistribution, comprehensive space reconfiguration, selective partition reconfiguration, integrated bedroom and multifunctional room, and flexible space division. These approaches reveal patterns in how Generation Y negotiates openness, privacy, multifunctionality, and regulatory constraints. The findings contribute to interiority scholarship by demonstrating how Generation Y residents in Bangkok actively shape one-bedroom-plus condominium units to balance openness, privacy, multifunctionality, and regulatory limits. These insights inform flexible residential design that supports ongoing reconfiguration without compromising building integrity, offering guidance for residents, developers, and policymakers towards resilient, user-centred urban living.]]>
