What are the principal advantages of using a single building information model of the existing conditions as the foundation for modeling proposed additions or renovations?
- Why not create a separate model for the new proposed design?
A single BIM of existing conditions ensures precise as-built geometry, minimizing errors and change orders by enabling accurate clash detection and field verification early in design. It serves as a unified source of truth for all disciplines, streamlining coordination between new additions and existing structure, MEP, and architectural elements. This foundation enhances efficiency, reduces rework, and supports better-informed decisions throughout renovations or expansions.
What sort of complexities are introduced when you construct a building complex in phases?
- What happens at the interfaces between the buildings as the phases advance?
- How can you plan and prepare for these complexities as your create your initial building model?
Phased construction introduces complexities such as temporary structural supports, staged MEP tie-ins, and evolving site logistics, requiring each phase to function independently while enabling future connections. At building interfaces, challenges arise from mismatched floor levels, shared foundations, fire-rated separations, and utility stubs that must align precisely across phases. These interfaces risk clashes, delays, or rework if not modeled accurately from the start. To prepare, the initial BIM should include phasing filters, design options for future states, temporary elements, and interface coordination zones to simulate and resolve conflicts early.
What are the principal advantages of using a single building information model of the existing conditions as the foundation for modeling several proposed design alternatives for a portion of the building?
- Why not create a separate model for each of the design alternatives?
In your project, which features of the proposed design did you choose to model as design alternatives?
- Why did you choose these building features? And what were the biggest challenges in modeling them as the design alternatives?