The cost of underpinning is dependent on the size of the structure and the linear meters of walls to be shored up.
Common Types of Underpinning:
- Continuous footing
- Grout injection
- Adjoining neighbours footing. As your new footing is going below grade of the bottom of neighbour’s then by law you are responsible for ensuring no damage to neighbour’s property.
In a domestic house type scenario You would expect to pay approx $1000 – $1200/ pier, about $1000 to $1500 / lin meter of continuous concrete footing installed, about $500/lin meter for soil strengthening using grout injection under existing footing + GST. Slab strengthening approx $500 to $700 / square meter.
Establishment cost on site approx $1000 – $10,000 depending on type of equipment required, the distance from head quarters to cover transfer expenses of labour, machinery and materials.