HiStruct Easy Guide: Modelling a Steel Building Lower Extension with Matching Roof Orientation

Creating building extensions is a common part of many projects. With the HiStruct Buildings 3D configurator, you can easily define how individual structures connect — including cases where the roof orientation needs to remain consistent.

This guide focuses on a specific case: creating a lower extension with matching roof orientation. In this scenario, the standard workflow may not lead directly to the desired result, so a slightly different approach is needed.

We’ll show you a simple solution that helps you achieve the desired geometry while maintaining full control over the model. Explore the step-by-step workflow below.

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How to Create a Building and a Lower Extension with Matching Roof Orientation

When creating a building and a lower extension with matching roof orientation, it is necessary to create the extension roof as a main building first and then the large hall as a "lean-to" part.

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1. In the Templates tab, choose "Buildings with leans-to" and open the project.

2. Create a building extension with the yellow button on the gable wall.  Note: You need to use extension "Add building":

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3. Now you can start creating the extension roof - this part you need to create from the main building in the model:

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4. Set the requested dimensions of the roof extension:

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5. Edit the dimensions of the large hall (you can set some values negative):

6. The final result:

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This approach allows you to create a lower extension with matching roof orientation while maintaining clean geometry and full control over the model.