Digital Twin
A digital model of a building that continues to be maintained and updated after construction ends, reflecting the building's actual as-built condition and, often, live data from its own building systems, distinct from a construction-phase [[concept-bim|BIM]] model, which typically stops being updated once the building is turned over.
Why it matters
A construction-phase model that's frozen at turnover quickly drifts out of sync with a building that gets renovated, has equipment replaced, or has systems reconfigured over years of operation. A digital twin exists specifically to keep that model current and useful long after the construction team has left the project.
On a real project
A hospital's facilities team uses a digital twin that reflects the building's actual as-built mechanical systems, letting them locate a specific valve behind a wall without guessing or opening up finishes to find it.
Who this matters most to
A Facilities Manager relies on an accurate digital twin to plan maintenance and locate building systems without opening up finished spaces to look. A BIM/VDC Specialist is often responsible for ensuring the construction-phase model is accurate enough at turnover to actually serve as the starting point for a useful digital twin.
Where this goes wrong
A project hands over its construction-phase model to the owner without reconciling it against the building's actual as-built conditions first. The facilities team later discovers the "digital twin" doesn't match what's actually behind the walls, making it less useful than simply not having one and relying on field verification instead.