Creating an Opening in the Stem Wall for a Garage Door

Reference Number: KB-00343
Last Modified: July 23, 2021

The information in this article appliesto:

Home Designer Professional or Home Designer Architectural or HomeDesigner Suite


I have created a first floor room with a garage door. When I add my foundation the stem wall will not create an opening for the garage door. Instead, the garage door seems to rest on top of the stem wall, just like the rest of the walls of my garage.


If certain conditions are not met, a stem wall will not recognize a garage door above it, and will treat it like other doors, which rest on top of the stem wall. To create a foundation in which the stem wall breaks and allows the garage door to reach the slab floor of a garage, follow the procedure below.

To create the garage room

  1. Click the Straight Exterior Wall tool, and in a clockwise fashion draw four connected walls.

  2. To define this room as a garage, use the Select Objects tool to click in the room to select it, then click on the Open Object edit tool to display the Room Specification dialog.

  3. On the General panel of the Room Specification dialog, define the room type as a Garage.

    If you skip this step, and do not define the room as a Garage, then Home Designer will treat the garage door as it does all other doors, and have it rest on top of the stem wall.

  4. Once this is complete, select the OK button to apply this change.

To build the foundation

  1. From the menu select Build> Floor> Build Foundation to display the Foundation Defaults dialog.

  2. In this dialog, you can set parameters for your foundation.

    For purposes of this tutorial, you can leave the defaults settings.

  3. Select the OK button to display the New Floor dialog. In this dialog, select Derive new foundation plan from 1st floor plan and click the OK button to create your foundation on Floor 0.

To return to the first floor to add the garage door

  1. Using the Up One Floor tool, return to Floor 1.

  2. Once you are back on the first floor, from the menu select Build> Door> Garage Door and click on the wall in which you want to add a garage door.

  3. To create a 3D view and ensure the garage door is correctly protruding into the foundation, from the menu select 3D> Create View> Full Overview .

  4. In the Full Overview, you will see that the garage door now penetrates through the stem wall, and it rests on the garage floor.

As you have probably noted, this process must be followed exactly in order for the foundation to recognize the garage door and form an opening for it.

In brief, you must first build the first floor and define the room as a garage. Then, you must build a foundation. The first floor room must be defined as a garage in order for Home Designer to build the foundation correctly. Once the first floor is built and the foundation is complete, the last step is to add the garage door.