Revit – Exporting Building Sites

Architects can design buildings in Revit, then export the relevant building content as a 3D model to civil engineering applications such as AutoCAD Civil 3D.

Since Revit cannot directly reference a Civil 3D file and Civil 3D cannot directly reference a Revit project, an intermediate file (.adsk export file) is use to  provide interoperability between them.

Before exporting building sites, there’s a number of things to do in order to create an efficient adsk file. Here’s a list of them:

  1. Simplify the Model: to make your adsk file as efficient as possible, only export the relevant parts of the model (such as exterior walls and doors) and hide the rest.
    1. Create a new 3D view for the export
    2. Set the function of all non-essentials items and non-essential building element (wall, door, stairs, etc.) to interior.  For each elements, the function can be set in the Edit Type.
    3. Hide the category of the elements that are not going to be relevant to the civil engineers (ceiling, furniture, rooms, etc…)
  2. Gross Building Area:  One requirement of the export building site command is to have at least one area plan designated as the gross building area.
    1. The gross area will eventually become the building footprint once exported.  Normally the area plan is based on the ground floor.
  3. Creating Site Utilities: You can place site utilities of interest to civil engineers such as: gas, water, telephone, cable and stream connections (hook-ups).
    1. Site utilities are simply loadable families that have a special connector in them. These connectors will become enabled once inside the civil engineering application.  For a connector to be exported, the Utility parameter must be selected in its instance properties.

After the building site preparations is complete , go to: Application Menu -> Export -> Building Site to export.