Model Walls with Levels, Base/Top Constraints, and Offsets

1. Switch to the Floor Plan where you want to start (e.g. Level 0).
2. On the Architecture tab, click Wall → Wall: Architectural.
3. In the options bar / Properties:
   • Base Constraint = the Level where the wall starts (e.g. Level 0).
   • Base Offset = vertical offset from that Level (e.g. 0, 500 mm, etc.).
   • Top Constraint = the Level where the wall ends (e.g. Level 1, Level 2).
   • Top Offset = adjustment above or below the top Level (positive or negative).
4. Draw the wall in plan view using lines/rectangles or Pick Lines.
5. Review in 3D view:
   • Confirm one wall starts exactly at the Level (offset 0).
   • Confirm any wall with Base Offset sits above the Level.
6. To adjust heights:
   • Change Top Constraint / Top Offset in Properties.
   • Or drag the top of the wall in an Elevation view.
7. When Level elevations change:
   • Revit automatically adjusts the wall top/bottom according to the constraints and offsets you set.

Tips

• Avoid making one continuous wall from ground to top floor; instead:
  • Split walls per Level so that different construction types and details can be applied per storey.
  • This also simplifies clash detection and local editing.

---

Taught in

• BIM + Computational Workflow · 2023 — original class recording lives there.