Like any construction project the structural integrity of the space is extremely important. If the project requires no wall removal and is a simple “re-model” then there are usually no structural issues. If there’s some water damage on the floor, then maybe a bit of work will be required.
If walls are being removed and the “footprint” of the room is being altered, then taking into consideration the structural integrity of the structure is necessary. Only a qualified tradesperson or engineer should be determining the requirements in each individual circumstance.