Terrain covers external stairwell

[sorelg]

Hi, 

I'm brand new and assume I am missing something obvious :).  Thank you in advance for any help.

 

I am using Home Designer 2026, Build 27.3.2.5 for MAC ARM, Dec 10, 2025

 

On floor 1: I created a porch room external to the main house.  It has a foundation, invisible walls and now roof/ceiling. 

On floor 0: I created stairs going from level 0 to level 1.  This worked fine and you can see them in the attachment.  I added landing at the bottom and top of the stairs.  They match the door and the present landing.

I then used the auto create stairwell between the two floors.

 

Everything appears to work fine except the terrain is overdrawing  on floor 1. When you look up from the bottom of the stairs you can confirm the stairwell is open.

I tired changing the terrain, but this did not help.  One attempt flattened all the stairs and I started over.  The terrain is -2" below floor 1 which says it is at "0".

 

Screen shots are attached.

 

Again, any help is appreciated and thank you in advance for your time.

 

[Rookie65]

Use a terrain hole around the foundation wall around the stairs 

[sorelg]

Thank you for the quick reply and pointing me in the right direction.  I'll learn how to do that and give it a try.   I appreciate your help. Thanks!