Almost any house plan can have its foundation changed. It’s common for people to design a different foundation if the available foundations do not suit their needs. If you are currently working with a builder you may want to ask them if they will take care of making the foundation changes for you. Sometimes with foundation design it may be helpful for somebody who is near you to do those changes because they will have more knowledge about your local soil conditions and the slope of your lot.
When changing foundation types, pay attention to where you will put the furnace, water heater, and stairs. If you need to add basement stairs, the basement stairs can usually be put under other stairways or you may be able to replace a closet or small room with basement stairs. Another common place to put basement stairs is to replace a mechanical room with stairs and move the mechanical items (such as the furnace and water heater) to the basement. Sometimes space near the laundry room, or space near the garage can be used for a basement stairs. Larger walk-in closets are sometimes reduced in size to allow space for basement stairs. You can often add a basement stairs to a plan without increasing the size of the plan. However, sometimes space may need to be added to a plan to provide room for a basement stairs.
It should be noted that it is the owner’s full responsibility to check with his/her local and state building authorities, his/her builder, and the designer of the house plan to ensure that the home meets all applicable building codes and requirements.