If you have bouncing floors, cracking walls and doors not closing how they should, you might need re-stumping work done to your house.
What is re-stumping?
Remedial repair work associated with the piers or stumps under the floor.
What are the causes?
Subsidence of concrete pads under the floor.
Rotting of timber.
Lack of ventilation.
What is the procedure?
Create access either by underfloor, trapdoor or cutting hole in floor.
Identify problem and causes, and replace or repair as required.