Underpinning beneath a non-bearing wall: always a defect?

What I’ve read says that only bearing walls should have underpinning installed. Is this always true?

What’s your definition of underpinning?

Underpinning is a method used to increase foundation depth or repairing faulty foundations. So technically, the gable end foundation of a structure could be faulty, but not really a bearing wall. But if left alone could cause damage to the structure without the underpinning.
Don’t know if that is what you are talking about.

Yes, that is, and good point! Thanks Marcel.

Are you referring to steel push piers or helical piers?

Just underpinning in general, Randy.

Never head of that, Kenton. I quite often inspect homes where foundation walls have been underpinned to stabilize or raise the foundation. Same holds true for common walls. Lots of century building row homes in Montreal being stabilized.

Methods of underpinning. Underpinning to Repair Faulty Foundations

Well put Marcel.

Just something I found online, Robert.