What to look for under and around your house that would indicate correction works need to be carried out now to stave off more costly future underpinning repairs for your property. If subsidence is an issue then floor levels will be an issue and so will underpinning costs. These sub-floor issues will at a later date start showing up in the walls with splits and cracks. Sub-Floor Maintenance will save on underpinning and re-stumping costs
If you have any concerns call in an underpinning expert to inspect your sub-floor.
Clay soils drying out causing shrinkage for your house to settle down. Typically dry weather and tree roots
Clay soils getting wet causing expansion inducing heave
Sandy soils getting washed out from surface and ground flows
Poorly compacted soils settling over time
House built on differing soil layers which have variable bearing capacity
Soil type. sand/silt/clay
Compaction. How loose are the particles. Typically surface layers are loose/deeper layers more compact/deeper layers good bearing capacity/then rock usually.