Types of Revit Families

Revit uses different types of families to build intelligent BIM models. Each plays a unique role in the design and documentation process. At AEC BIM Services LLC, we understand how to develop, customize, and manage these families to support accurate and efficient project delivery.  

1. System Families (Default Families)

System Families come pre-built within Revit and are integral to its core framework. They cannot be deleted, saved as separate files, or used across different projects. These families are essential for creating key building elements such as walls, roofs, floors, ceilings, and other basic 3D components.

While System Families may vary in their properties and parameters, their foundational behavior remains consistent—making them ideal for creating core building geometry that must remain standardized across the model.

2. Loadable Families

Loadable Families are the most commonly used type in BIM modeling. These families are created as separate .rfa files and can be customized, reused across multiple projects, and shared with manufacturers or product designers.  

Also known as component families, they offer complete flexibility. BIM specialists or Revit family developers can edit, update, or modify them based on project requirements. Using the Revit Family Editor, these families can be easily customized with parameters controlling dimensions, materials, visibility, and other properties. 

Loadable Families can also be nested, allowing multiple families to be combined into one intelligent component—ideal for complex geometry or parametric assemblies. 

At AEC BIM Services LLC, we develop Loadable Families tailored to project specifications, using constraints and parameters to ensure accurate, high-performance BIM content.

3. In-Place Families

In-Place Families are similar to Loadable Families but are created directly within a specific project and cannot be reused elsewhere. They do not generate separate .rfa files and exist only within the model where they were created. 

These families are ideal for unique, project-specific geometry or custom elements that are not intended to be standardized. In-Place Families work well for modeling highly customized walls, floors, roofs, or one-off architectural elements.

Our team uses In-Place Families when a model requires unique forms that cannot be efficiently built using standard or loadable content.

4. Nested Families

Nested Families are created when one family is inserted into another to form a more complex or highly detailed component. This technique is essential for modeling intricate geometry or elements that require multiple family types to work together.

Nested Families offer advanced control, flexibility, and scalability—allowing BIM modelers to manage complex assemblies while maintaining precise parametric behavior.

Our Expertise in Revit Family Development

These family types play a crucial role in delivering a complete and accurate BIM model. At AEC BIM Services LLC, we thoroughly understand each category and apply the right methodology based on project needs. We ensure clarity, precision, and efficiency in all Revit Family creation work—especially for MEP, Architectural, and Structural components.

Our expertise ensures your models perform seamlessly, support detailed documentation, and meet all project standards.