After creating walls, check to see if positioned  on correct Levels and that they match the provided drawings.

Foundation walls must always be created with the base of foundation wall set to a minimum of negative 5 feet (-5'-0")

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Do NOT set the Base Constraint of Ground Floor walls to act as foundation walls.

Wall Extensions may however be used. See tutorials to learn how to unlock Wall Extensions.

Top Constraint of Walls should be set to the floor directly above unless absolutely necessary. This allows for ease of verification of accuracy of wall positioning. 

For scenarios where there are similar type openings on the floors above or below, please  refer to Method of Construction