Even there, "open up this wall" is not a unit of work. You need to:

* Evaluate what, if any, structural implications removing the wall has * Tear down the existing wall * Redo any plumbing, ductwork, wiring, etc that was hiding in the wall * Remediate structural concerns from removing the wall. * Redo the flooring * Repair and repaint any damage done to remaining drywall

If this is part of a larger renovation, you will likely schedule work so the above tasks happen at the same time as other similar tasks.

E.g. A meaningful unit of work might be "electrical roughing", which would include both moving wires that were previously in the wall, and running a new circuit to the garage for a car charger. No user story covers those to tasks, but the nature of renovating a house means that it makes sense to do them together.