The presented work describes the procedure of the preparation and creation of parametric 3D CAD models of steel structures, which allow for the adaptation to the specific requirements of prefabricated construction projects. Parametrisation reduces the time needed to adjust and create different model versions, which is especially useful in industrial production where flexibility and speed are key factors. The presented approach includes the steps of identification and modelling of design parameters and their relationships. The introductory section describes what prefabricated construction is, how it is used in industry, and what are its benefits, including greater quality control, reduced waste, and faster on-site assembly. The role of parameterisation in the process of creating 3D CAD models of prefabricated steel structures is also explained, with an emphasis on the automation of design changes in the model. Next, several existing steel structure assemblies, including their floor, wall, and ceiling elements, were analysed, and the key parameters needed for modelling were identified. The analysis included different versions of the steel structure design, with variations in geometry and functional components such as doors and windows. This made it possible to formulate general and specific parameters that are used in the further creation of the model. Based on the analysis, the parameters for creating a 3D CAD model were formulated, and the connections between the various parameters were quantified. Emphasis is placed on the mutual dependence of parameters, which enables automatic adjustments of the model when certain values change, thereby reducing the possibility of errors. In the practical part of the presented work, the preparation and parametrisation of the steel structure model in the CAD system SolidWorks are presented, and several examples of changes in the design based on different parameter specifications are demonstrated. The included examples show how the tabular interface can be used to manage model parameters, further facilitating control over various performances and configurations.
