A Fully Parametric Security Door Family
The project involved analysing a real security door, recording dimensions, and translating its structural and mechanical components into a modular, nested family system. Using reference planes, constraints, and labelled parameters, the model was designed to adapt dynamically to changes in size, materials, and operational states, including door rotation and bolt positioning. The workflow followed a structured top-down modelling strategy, combining sweep, extrusion, and void geometry to create coordinated assemblies such as the frame, door leaf, hinges, and locking mechanism.
The recording demonstrates the parametric controls and interactive elements built into the model.
The modelling process was based on the direct analysis of an existing residential security door.
To manage the complexity of the door assembly, a nested family structure was implemented. This approach improves model organisation, reduces file complexity, and enables individual components to be reused in other BIM projects.
The hierarchy of the model was structured as follows:
Door Frame – modelled directly within the main door family.
Door Leaf – created as a separate Generic Model family and loaded into the host door family.
Hardware components (hinges, handles, bolts, peephole, etc.) – developed as face-based Generic Model families and nested within the relevant assemblies
A key objective of the project was to develop a fully parametric BIM object capable of adapting to different design conditions.
The model, therefore, includes adjustable parameters that allow users to modify.
Every door in the image comes from the same single family; only the parameters were changed.
What the family can do:
🔹 Adjustable width and height
🔹 Custom materials for door panel and metal elements
🔹 Detailed hardware modelling.
Door Wireframe
Door Frame Wireframe
Door Leaf Wireframe