BIM-driven communication of design for residential building projects: enhancing cost transparency and buyer engagement in staged investment modelsHaque, Manzurul (Avtor) Cerovšek, Tomo (Mentor) master thesisreal time cost feedbackresidential constructionstaged investment modelscost transparencybuyer engagement5D BIMclassification systemThis thesis examines how Building Information Modelling (BIM) can improve communication with homebuyers in residential projects. It focuses on staged investment models, where instalment payments and trust rely on cost transparency & clear information about design choices and costs. Traditionally buyers rely on drawings, brochures and visualisations, while BIM platforms remain complex for nontechnical users. A gap persists: no system lets buyers view options, see cost impact, and connect choices to payment schedules dynamically. To address this gap, a prototype was developed and tested. A flat was extracted from a G+4 building, with a kitchen partition wall and floor finishes as tests. The system imported data from the BIM model, including quantities, classification codes and unit prices from a 5D cost sheet, establishing a baseline for cost. The model gets converted to GLTF so buyers could change architectural elements while structural remains locked. Each change triggered quantity recalculation applied the unit rate and updated the total price on screen. The changes were saved in an Excel file and uploaded to the Common Data Environment, enabling updates of staged instalments instantly. The prototype was limited to one unit, faced stability issues and lacked IFC regeneration. Even so, it showed that classification-based cost updates are feasible and can be tied to staged payment models, offering a proof of concept for cost transparency, fewer disputes and trust in residential construction.[M. Haque]20252025-09-23 08:45:56Magistrsko delo/naloga173782UDK: 004:336.532.1:69(043.2)VisID: 174759COBISS_ID: 250524163sl