Construction teams lose time when design intent, site reality, and stakeholder feedback sit in separate systems. A drawing says one thing. The site shows another. A meeting produces a third interpretation. Integrating 3D BIM with VR walkthroughs reduces that gap. The model becomes more than a design file. It becomes a spatial decision tool. Teams can walk through a proposed building, compare it with site conditions, detect access issues, assess clearances, and explain constru