Johan Josefsson, BIM lead and electrical consultant at Rejlers, presents how the electrical team delivered a fully 3D-based workflow on the Kaj 16 project in Gothenburg. The client, Vasakronan, required a “Total BIM” process—meaning that all production material had to come directly from the model. For the electrical discipline, traditionally dependent on 2D drawings, this was a major shift.

To meet the challenge, Rejlers developed an in-house Revit add-in (using the Revit API and Python) that enabled the creation of the first fully modelled 3D cable solution they know of. Larger, cost-critical cables were modelled in detail, while smaller ones were represented schematically to balance time and value. Close collaboration with the electrical contractor was crucial; their willingness to adopt the workflow made the transition possible.

With everything modelled, Rejlers implemented structured status management using the MMI (Model Maturity Index), digital checklists, and bidirectional syncing between StreamBIM and Revit. A change-warning system ensures that objects approved for production (MMI 400) cannot be altered without generating a PM/issue. Weekly IFC exports feed into automated Power BI dashboards, giving real-time quantities of cables, trays, and equipment by zone—helping contractors with planning, purchasing and calculations.

A live demo showed how StreamBIM is used for filtering, cable tracing, checklists and communication channels. During the Q&A, Johan explained their semi-automated cable routing, the importance of supporting contractors on site, and ongoing development with suppliers such as Fagerhult to bring sensor data into StreamBIM. With completion set for 2028, more data and lessons will accumulate as the model-based workflow matures.