Using the Gable Roof Line Tool

Reference Number: KB-00062
Last Modified: July 21, 2021

The information in this article applies to:

Home Designer Professional or Home Designer Architectural


Home Designer Architectural and Home Designer Pro both have the Gable/Roof Line tool. When would I use this tool instead of a normal "Full Gable" wall?

Exterior view of house with three gables


The Gable/Roof Line tool can be used to  automatically generate a gable above the bearing wall of a hip roof  plane. It is best used in situations where roof directives in walls are  not possible.

For example:

  • If a Break Wall would be required in the same location as a door or window;

  • Where a wall is not present, such as across the front of an alcove;

  • Over a Bay, Box, or Bow Window.


To create a gable using a Gable/Roof Line

  1. Select Build> Roof> Gable/Roof Line , then click and drag to draw a line outside of the exterior wall that you want to create a gable over.

    Floor Plan view of house with gable line being drawn parallel to and outside of exterior wall

  2. Position the Gable/Roof Line within 10 feet (2260 mm) of the wall’s Main Layer but, not touching it.

    Make sure that the Gable/Roof Line is exactly parallel to the exterior wall.

  3. Resize the Gable/Roof Line so that it's the length of the desired gable.

    Gable/Roof Line being resized and positioned

    • The length of the Gable/Roof Line determines the gable width at the wall Main Layer, not at the overhang.

    • At the larger roof eave, a gable roof is wider than the gable line by twice the overhang distance.

  4. Select Build> Roof> Build Roof  and regenerate the roof, if you don't already have Auto Rebuild Roofs enabled.

    Build Roof dialog with Auto Rebuild Roofs selected